struct AVCodecDescriptor This struct describes the properties of a single codec described by an AVCodecID. More...
struct AVCodecParameters This struct describes the properties of an encoded stream. More...
Macros #define AV_CODEC_FLAG_UNALIGNED (1 << 0)  Allow decoders to produce frames with data planes that are not aligned to CPU requirements (e.g. More...
#define AV_CODEC_FLAG_QSCALE (1 << 1)  Use fixed qscale. More...
#define AV_CODEC_FLAG_4MV (1 << 2)  4 MV per MB allowed / advanced prediction for H.263. More...
#define AV_CODEC_FLAG_OUTPUT_CORRUPT (1 << 3)  Output even those frames that might be corrupted. More...
#define AV_CODEC_FLAG_QPEL (1 << 4)  Use qpel MC. More...
#define AV_CODEC_FLAG_DROPCHANGED (1 << 5)  Don't output frames whose parameters differ from first decoded frame in stream. More...
#define AV_CODEC_FLAG_RECON_FRAME (1 << 6)  Request the encoder to output reconstructed frames, i.e. frames that would be produced by decoding the encoded bistream. More...
#define AV_CODEC_FLAG_COPY_OPAQUE (1 << 7) #define AV_CODEC_FLAG_FRAME_DURATION (1 << 8)  Signal to the encoder that the values of AVFrame.duration are valid and should be used (typically for transferring them to output packets). More...
#define AV_CODEC_FLAG_PASS1 (1 << 9)  Use internal 2pass ratecontrol in first pass mode. More...
#define AV_CODEC_FLAG_PASS2 (1 << 10)  Use internal 2pass ratecontrol in second pass mode. More...
#define AV_CODEC_FLAG_LOOP_FILTER (1 << 11)  loop filter. More...
#define AV_CODEC_FLAG_GRAY (1 << 13)  Only decode/encode grayscale. More...
#define AV_CODEC_FLAG_PSNR (1 << 15)  error[?] variables will be set during encoding. More...
#define AV_CODEC_FLAG_INTERLACED_DCT (1 << 18)  Use interlaced DCT. More...
#define AV_CODEC_FLAG_LOW_DELAY (1 << 19)  Force low delay. More...
#define AV_CODEC_FLAG_GLOBAL_HEADER (1 << 22)  Place global headers in extradata instead of every keyframe. More...
#define AV_CODEC_FLAG_BITEXACT (1 << 23)  Use only bitexact stuff (except (I)DCT). More...
#define AV_CODEC_FLAG_AC_PRED (1 << 24)  H.263 advanced intra coding / MPEG-4 AC prediction. More...
#define AV_CODEC_FLAG_INTERLACED_ME (1 << 29)  interlaced motion estimation More...
#define AV_CODEC_FLAG_CLOSED_GOP (1 U << 31) #define AV_CODEC_FLAG2_FAST (1 << 0)  Allow non spec compliant speedup tricks. More...
#define AV_CODEC_FLAG2_NO_OUTPUT (1 << 2)  Skip bitstream encoding. More...
#define AV_CODEC_FLAG2_LOCAL_HEADER (1 << 3)  Place global headers at every keyframe instead of in extradata. More...
#define AV_CODEC_FLAG2_CHUNKS (1 << 15)  Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries. More...
#define AV_CODEC_FLAG2_IGNORE_CROP (1 << 16)  Discard cropping information from SPS . More...
#define AV_CODEC_FLAG2_SHOW_ALL (1 << 22)  Show all frames before the first keyframe. More...
#define AV_CODEC_FLAG2_EXPORT_MVS (1 << 28)  Export motion vectors through frame side data. More...
#define AV_CODEC_FLAG2_SKIP_MANUAL (1 << 29)  Do not skip samples and export skip information as frame side data. More...
#define AV_CODEC_FLAG2_RO_FLUSH_NOOP (1 << 30)  Do not reset ASS ReadOrder field on flush (subtitles decoding) More...
#define AV_CODEC_FLAG2_ICC_PROFILES (1 U << 31)  Generate/parse ICC profiles on encode/decode, as appropriate for the type of file. More...
#define AV_CODEC_EXPORT_DATA_MVS (1 << 0)  Export motion vectors through frame side data. More...
#define AV_CODEC_EXPORT_DATA_PRFT (1 << 1)  Export encoder Producer Reference Time through packet side data. More...
#define AV_CODEC_EXPORT_DATA_VIDEO_ENC_PARAMS (1 << 2)  Decoding only. More...
#define AV_CODEC_EXPORT_DATA_FILM_GRAIN (1 << 3)  Decoding only. More...
#define AV_GET_BUFFER_FLAG_REF (1 << 0)  The decoder will keep a reference to the frame and may reuse it later. More...
#define AV_GET_ENCODE_BUFFER_FLAG_REF (1 << 0)  The encoder will keep a reference to the packet and may reuse it later. More...
#define AV_SUBTITLE_FLAG_FORCED 0x00000001 #define AV_CODEC_CAP_DRAW_HORIZ_BAND (1 << 0) Decoder can use draw_horiz_band callback. More...
#define AV_CODEC_CAP_DR1 (1 << 1)  Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators. More...
#define AV_CODEC_CAP_DELAY (1 << 5) Encoder or decoder requires flushing with NULL input at the end in order to give the complete and correct output. More...
#define AV_CODEC_CAP_SMALL_LAST_FRAME (1 << 6)  Codec can be fed a final frame with a smaller size. More...
#define AV_CODEC_CAP_EXPERIMENTAL (1 << 9)  Codec is experimental and is thus avoided in favor of non experimental encoders. More...
#define AV_CODEC_CAP_CHANNEL_CONF (1 << 10)  Codec should fill in channel configuration and samplerate instead of container. More...
#define AV_CODEC_CAP_FRAME_THREADS (1 << 12)  Codec supports frame-level multithreading. More...
#define AV_CODEC_CAP_SLICE_THREADS (1 << 13)  Codec supports slice-based (or partition-based) multithreading. More...
#define AV_CODEC_CAP_PARAM_CHANGE (1 << 14)  Codec supports changed parameters at any point. More...
#define AV_CODEC_CAP_OTHER_THREADS (1 << 15)  Codec supports multithreading through a method other than slice- or frame-level multithreading. More...
#define AV_CODEC_CAP_VARIABLE_FRAME_SIZE (1 << 16)  Audio encoder supports receiving a different number of samples in each call. More...
#define AV_CODEC_CAP_AVOID_PROBING (1 << 17) Decoder is not a preferred choice for probing. More...
#define AV_CODEC_CAP_HARDWARE (1 << 18)  Codec is backed by a hardware implementation. More...
#define AV_CODEC_CAP_HYBRID (1 << 19)  Codec is potentially backed by a hardware implementation, but not necessarily. More...
#define AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE (1 << 20)  This encoder can reorder user opaque values from input AVFrames and return them with corresponding output packets. More...
#define AV_CODEC_CAP_ENCODER_FLUSH (1 << 21)  This encoder can be flushed using avcodec_flush_buffers() . More...
#define AV_CODEC_CAP_ENCODER_RECON_FRAME (1 << 22)  The encoder is able to output reconstructed frame data, i.e. More...
#define AV_CODEC_PROP_INTRA_ONLY (1 << 0)  Codec uses only intra compression. More...
#define AV_CODEC_PROP_LOSSY (1 << 1)  Codec supports lossy compression. More...
#define AV_CODEC_PROP_LOSSLESS (1 << 2)  Codec supports lossless compression. More...
#define AV_CODEC_PROP_REORDER (1 << 3)  Codec supports frame reordering. More...
#define AV_CODEC_PROP_FIELDS (1 << 4)  Video codec supports separate coding of fields in interlaced frames. More...
#define AV_CODEC_PROP_BITMAP_SUB (1 << 16)  Subtitle codec is bitmap based Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field. More...
#define AV_CODEC_PROP_TEXT_SUB (1 << 17)  Subtitle codec is text based. More...
Enumerations enum AVSubtitleType { SUBTITLE_NONE , SUBTITLE_BITMAP , SUBTITLE_TEXT , SUBTITLE_ASS enum  { AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX = 0x01, AV_CODEC_HW_CONFIG_METHOD_HW_FRAMES_CTX = 0x02, AV_CODEC_HW_CONFIG_METHOD_INTERNAL = 0x04, AV_CODEC_HW_CONFIG_METHOD_AD_HOC = 0x08 enum AVCodecID {
AV_CODEC_ID_NONE , AV_CODEC_ID_MPEG1VIDEO , AV_CODEC_ID_MPEG2VIDEO , AV_CODEC_ID_H261 , AV_CODEC_ID_H263 , AV_CODEC_ID_RV10 , AV_CODEC_ID_RV20 , AV_CODEC_ID_MJPEG , AV_CODEC_ID_MJPEGB , AV_CODEC_ID_LJPEG , AV_CODEC_ID_SP5X , AV_CODEC_ID_JPEGLS , AV_CODEC_ID_MPEG4 , AV_CODEC_ID_RAWVIDEO , AV_CODEC_ID_MSMPEG4V1 , AV_CODEC_ID_MSMPEG4V2 , AV_CODEC_ID_MSMPEG4V3 , AV_CODEC_ID_WMV1 , AV_CODEC_ID_WMV2 , AV_CODEC_ID_H263P , AV_CODEC_ID_H263I , AV_CODEC_ID_FLV1 , AV_CODEC_ID_SVQ1 , AV_CODEC_ID_SVQ3 , AV_CODEC_ID_DVVIDEO , AV_CODEC_ID_HUFFYUV , AV_CODEC_ID_CYUV , AV_CODEC_ID_H264 , AV_CODEC_ID_INDEO3 , AV_CODEC_ID_VP3 , AV_CODEC_ID_THEORA , AV_CODEC_ID_ASV1 , AV_CODEC_ID_ASV2 , AV_CODEC_ID_FFV1 , AV_CODEC_ID_4XM , AV_CODEC_ID_VCR1 , AV_CODEC_ID_CLJR , AV_CODEC_ID_MDEC , AV_CODEC_ID_ROQ , AV_CODEC_ID_INTERPLAY_VIDEO , AV_CODEC_ID_XAN_WC3 , AV_CODEC_ID_XAN_WC4 , AV_CODEC_ID_RPZA , AV_CODEC_ID_CINEPAK , AV_CODEC_ID_WS_VQA , AV_CODEC_ID_MSRLE , AV_CODEC_ID_MSVIDEO1 , AV_CODEC_ID_IDCIN , AV_CODEC_ID_8BPS , AV_CODEC_ID_SMC , AV_CODEC_ID_FLIC , AV_CODEC_ID_TRUEMOTION1 , AV_CODEC_ID_VMDVIDEO , AV_CODEC_ID_MSZH , AV_CODEC_ID_ZLIB , AV_CODEC_ID_QTRLE , AV_CODEC_ID_TSCC , AV_CODEC_ID_ULTI , AV_CODEC_ID_QDRAW , AV_CODEC_ID_VIXL , AV_CODEC_ID_QPEG , AV_CODEC_ID_PNG , AV_CODEC_ID_PPM , AV_CODEC_ID_PBM , AV_CODEC_ID_PGM , AV_CODEC_ID_PGMYUV , AV_CODEC_ID_PAM , AV_CODEC_ID_FFVHUFF , AV_CODEC_ID_RV30 , AV_CODEC_ID_RV40 , AV_CODEC_ID_VC1 , AV_CODEC_ID_WMV3 , AV_CODEC_ID_LOCO , AV_CODEC_ID_WNV1 , AV_CODEC_ID_AASC , AV_CODEC_ID_INDEO2 , AV_CODEC_ID_FRAPS , AV_CODEC_ID_TRUEMOTION2 , AV_CODEC_ID_BMP , AV_CODEC_ID_CSCD , AV_CODEC_ID_MMVIDEO , AV_CODEC_ID_ZMBV , AV_CODEC_ID_AVS , AV_CODEC_ID_SMACKVIDEO , AV_CODEC_ID_NUV , AV_CODEC_ID_KMVC , AV_CODEC_ID_FLASHSV , AV_CODEC_ID_CAVS , AV_CODEC_ID_JPEG2000 , AV_CODEC_ID_VMNC , AV_CODEC_ID_VP5 , AV_CODEC_ID_VP6 , AV_CODEC_ID_VP6F , AV_CODEC_ID_TARGA , AV_CODEC_ID_DSICINVIDEO , AV_CODEC_ID_TIERTEXSEQVIDEO , AV_CODEC_ID_TIFF , AV_CODEC_ID_GIF , AV_CODEC_ID_DXA , AV_CODEC_ID_DNXHD , AV_CODEC_ID_THP , AV_CODEC_ID_SGI , AV_CODEC_ID_C93 , AV_CODEC_ID_BETHSOFTVID , AV_CODEC_ID_PTX , AV_CODEC_ID_TXD , AV_CODEC_ID_VP6A , AV_CODEC_ID_AMV , AV_CODEC_ID_VB , AV_CODEC_ID_PCX , AV_CODEC_ID_SUNRAST , AV_CODEC_ID_INDEO4 , AV_CODEC_ID_INDEO5 , AV_CODEC_ID_MIMIC , AV_CODEC_ID_RL2 , AV_CODEC_ID_ESCAPE124 , AV_CODEC_ID_DIRAC , AV_CODEC_ID_BFI , AV_CODEC_ID_CMV , AV_CODEC_ID_MOTIONPIXELS , AV_CODEC_ID_TGV , AV_CODEC_ID_TGQ , AV_CODEC_ID_TQI , AV_CODEC_ID_AURA , AV_CODEC_ID_AURA2 , AV_CODEC_ID_V210X , AV_CODEC_ID_TMV , AV_CODEC_ID_V210 , AV_CODEC_ID_DPX , AV_CODEC_ID_MAD , AV_CODEC_ID_FRWU , AV_CODEC_ID_FLASHSV2 , AV_CODEC_ID_CDGRAPHICS , AV_CODEC_ID_R210 , AV_CODEC_ID_ANM , AV_CODEC_ID_BINKVIDEO , AV_CODEC_ID_IFF_ILBM , AV_CODEC_ID_KGV1 , AV_CODEC_ID_YOP , AV_CODEC_ID_VP8 , AV_CODEC_ID_PICTOR , AV_CODEC_ID_ANSI , AV_CODEC_ID_A64_MULTI , AV_CODEC_ID_A64_MULTI5 , AV_CODEC_ID_R10K , AV_CODEC_ID_MXPEG , AV_CODEC_ID_LAGARITH , AV_CODEC_ID_PRORES , AV_CODEC_ID_JV , AV_CODEC_ID_DFA , AV_CODEC_ID_WMV3IMAGE , AV_CODEC_ID_VC1IMAGE , AV_CODEC_ID_UTVIDEO , AV_CODEC_ID_BMV_VIDEO , AV_CODEC_ID_VBLE , AV_CODEC_ID_DXTORY , AV_CODEC_ID_V410 , AV_CODEC_ID_XWD , AV_CODEC_ID_CDXL , AV_CODEC_ID_XBM , AV_CODEC_ID_ZEROCODEC , AV_CODEC_ID_MSS1 , AV_CODEC_ID_MSA1 , AV_CODEC_ID_TSCC2 , AV_CODEC_ID_MTS2 , AV_CODEC_ID_CLLC , AV_CODEC_ID_MSS2 , AV_CODEC_ID_VP9 , AV_CODEC_ID_AIC , AV_CODEC_ID_ESCAPE130 , AV_CODEC_ID_G2M , AV_CODEC_ID_WEBP , AV_CODEC_ID_HNM4_VIDEO , AV_CODEC_ID_HEVC , AV_CODEC_ID_FIC , AV_CODEC_ID_ALIAS_PIX , AV_CODEC_ID_BRENDER_PIX , AV_CODEC_ID_PAF_VIDEO , AV_CODEC_ID_EXR , AV_CODEC_ID_VP7 , AV_CODEC_ID_SANM , AV_CODEC_ID_SGIRLE , AV_CODEC_ID_MVC1 , AV_CODEC_ID_MVC2 , AV_CODEC_ID_HQX , AV_CODEC_ID_TDSC , AV_CODEC_ID_HQ_HQA , AV_CODEC_ID_HAP , AV_CODEC_ID_DDS , AV_CODEC_ID_DXV , AV_CODEC_ID_SCREENPRESSO , AV_CODEC_ID_RSCC , AV_CODEC_ID_AVS2 , AV_CODEC_ID_PGX , AV_CODEC_ID_AVS3 , AV_CODEC_ID_MSP2 , AV_CODEC_ID_VVC , AV_CODEC_ID_Y41P , AV_CODEC_ID_AVRP , AV_CODEC_ID_012V , AV_CODEC_ID_AVUI , AV_CODEC_ID_AYUV , AV_CODEC_ID_TARGA_Y216 , AV_CODEC_ID_V308 , AV_CODEC_ID_V408 , AV_CODEC_ID_YUV4 , AV_CODEC_ID_AVRN , AV_CODEC_ID_CPIA , AV_CODEC_ID_XFACE , AV_CODEC_ID_SNOW , AV_CODEC_ID_SMVJPEG , AV_CODEC_ID_APNG , AV_CODEC_ID_DAALA , AV_CODEC_ID_CFHD , AV_CODEC_ID_TRUEMOTION2RT , AV_CODEC_ID_M101 , AV_CODEC_ID_MAGICYUV , AV_CODEC_ID_SHEERVIDEO , AV_CODEC_ID_YLC , AV_CODEC_ID_PSD , AV_CODEC_ID_PIXLET , AV_CODEC_ID_SPEEDHQ , AV_CODEC_ID_FMVC , AV_CODEC_ID_SCPR , AV_CODEC_ID_CLEARVIDEO , AV_CODEC_ID_XPM , AV_CODEC_ID_AV1 , AV_CODEC_ID_BITPACKED , AV_CODEC_ID_MSCC , AV_CODEC_ID_SRGC , AV_CODEC_ID_SVG , AV_CODEC_ID_GDV , AV_CODEC_ID_FITS , AV_CODEC_ID_IMM4 , AV_CODEC_ID_PROSUMER , AV_CODEC_ID_MWSC , AV_CODEC_ID_WCMV , AV_CODEC_ID_RASC , AV_CODEC_ID_HYMT , AV_CODEC_ID_ARBC , AV_CODEC_ID_AGM , AV_CODEC_ID_LSCR , AV_CODEC_ID_VP4 , AV_CODEC_ID_IMM5 , AV_CODEC_ID_MVDV , AV_CODEC_ID_MVHA , AV_CODEC_ID_CDTOONS , AV_CODEC_ID_MV30 , AV_CODEC_ID_NOTCHLC , AV_CODEC_ID_PFM , AV_CODEC_ID_MOBICLIP , AV_CODEC_ID_PHOTOCD , AV_CODEC_ID_IPU , AV_CODEC_ID_ARGO , AV_CODEC_ID_CRI , AV_CODEC_ID_SIMBIOSIS_IMX , AV_CODEC_ID_SGA_VIDEO , AV_CODEC_ID_GEM , AV_CODEC_ID_VBN , AV_CODEC_ID_JPEGXL , AV_CODEC_ID_QOI , AV_CODEC_ID_PHM , AV_CODEC_ID_RADIANCE_HDR , AV_CODEC_ID_WBMP , AV_CODEC_ID_MEDIA100 , AV_CODEC_ID_VQC , AV_CODEC_ID_PDV , AV_CODEC_ID_EVC , AV_CODEC_ID_RTV1 , AV_CODEC_ID_VMIX , AV_CODEC_ID_FIRST_AUDIO = 0x10000, AV_CODEC_ID_PCM_S16LE = 0x10000, AV_CODEC_ID_PCM_S16BE , AV_CODEC_ID_PCM_U16LE , AV_CODEC_ID_PCM_U16BE , AV_CODEC_ID_PCM_S8 , AV_CODEC_ID_PCM_U8 , AV_CODEC_ID_PCM_MULAW , AV_CODEC_ID_PCM_ALAW , AV_CODEC_ID_PCM_S32LE , AV_CODEC_ID_PCM_S32BE , AV_CODEC_ID_PCM_U32LE , AV_CODEC_ID_PCM_U32BE , AV_CODEC_ID_PCM_S24LE , AV_CODEC_ID_PCM_S24BE , AV_CODEC_ID_PCM_U24LE , AV_CODEC_ID_PCM_U24BE , AV_CODEC_ID_PCM_S24DAUD , AV_CODEC_ID_PCM_ZORK , AV_CODEC_ID_PCM_S16LE_PLANAR , AV_CODEC_ID_PCM_DVD , AV_CODEC_ID_PCM_F32BE , AV_CODEC_ID_PCM_F32LE , AV_CODEC_ID_PCM_F64BE , AV_CODEC_ID_PCM_F64LE , AV_CODEC_ID_PCM_BLURAY , AV_CODEC_ID_PCM_LXF , AV_CODEC_ID_S302M , AV_CODEC_ID_PCM_S8_PLANAR , AV_CODEC_ID_PCM_S24LE_PLANAR , AV_CODEC_ID_PCM_S32LE_PLANAR , AV_CODEC_ID_PCM_S16BE_PLANAR , AV_CODEC_ID_PCM_S64LE , AV_CODEC_ID_PCM_S64BE , AV_CODEC_ID_PCM_F16LE , AV_CODEC_ID_PCM_F24LE , AV_CODEC_ID_PCM_VIDC , AV_CODEC_ID_PCM_SGA , AV_CODEC_ID_ADPCM_IMA_QT = 0x11000, AV_CODEC_ID_ADPCM_IMA_WAV , AV_CODEC_ID_ADPCM_IMA_DK3 , AV_CODEC_ID_ADPCM_IMA_DK4 , AV_CODEC_ID_ADPCM_IMA_WS , AV_CODEC_ID_ADPCM_IMA_SMJPEG , AV_CODEC_ID_ADPCM_MS , AV_CODEC_ID_ADPCM_4XM , AV_CODEC_ID_ADPCM_XA , AV_CODEC_ID_ADPCM_ADX , AV_CODEC_ID_ADPCM_EA , AV_CODEC_ID_ADPCM_G726 , AV_CODEC_ID_ADPCM_CT , AV_CODEC_ID_ADPCM_SWF , AV_CODEC_ID_ADPCM_YAMAHA , AV_CODEC_ID_ADPCM_SBPRO_4 , AV_CODEC_ID_ADPCM_SBPRO_3 , AV_CODEC_ID_ADPCM_SBPRO_2 , AV_CODEC_ID_ADPCM_THP , AV_CODEC_ID_ADPCM_IMA_AMV , AV_CODEC_ID_ADPCM_EA_R1 , AV_CODEC_ID_ADPCM_EA_R3 , AV_CODEC_ID_ADPCM_EA_R2 , AV_CODEC_ID_ADPCM_IMA_EA_SEAD , AV_CODEC_ID_ADPCM_IMA_EA_EACS , AV_CODEC_ID_ADPCM_EA_XAS , AV_CODEC_ID_ADPCM_EA_MAXIS_XA , AV_CODEC_ID_ADPCM_IMA_ISS , AV_CODEC_ID_ADPCM_G722 , AV_CODEC_ID_ADPCM_IMA_APC , AV_CODEC_ID_ADPCM_VIMA , AV_CODEC_ID_ADPCM_AFC , AV_CODEC_ID_ADPCM_IMA_OKI , AV_CODEC_ID_ADPCM_DTK , AV_CODEC_ID_ADPCM_IMA_RAD , AV_CODEC_ID_ADPCM_G726LE , AV_CODEC_ID_ADPCM_THP_LE , AV_CODEC_ID_ADPCM_PSX , AV_CODEC_ID_ADPCM_AICA , AV_CODEC_ID_ADPCM_IMA_DAT4 , AV_CODEC_ID_ADPCM_MTAF , AV_CODEC_ID_ADPCM_AGM , AV_CODEC_ID_ADPCM_ARGO , AV_CODEC_ID_ADPCM_IMA_SSI , AV_CODEC_ID_ADPCM_ZORK , AV_CODEC_ID_ADPCM_IMA_APM , AV_CODEC_ID_ADPCM_IMA_ALP , AV_CODEC_ID_ADPCM_IMA_MTF , AV_CODEC_ID_ADPCM_IMA_CUNNING , AV_CODEC_ID_ADPCM_IMA_MOFLEX , AV_CODEC_ID_ADPCM_IMA_ACORN , AV_CODEC_ID_ADPCM_XMD , AV_CODEC_ID_AMR_NB = 0x12000, AV_CODEC_ID_AMR_WB , AV_CODEC_ID_RA_144 = 0x13000, AV_CODEC_ID_RA_288 , AV_CODEC_ID_ROQ_DPCM = 0x14000, AV_CODEC_ID_INTERPLAY_DPCM , AV_CODEC_ID_XAN_DPCM , AV_CODEC_ID_SOL_DPCM , AV_CODEC_ID_SDX2_DPCM , AV_CODEC_ID_GREMLIN_DPCM , AV_CODEC_ID_DERF_DPCM , AV_CODEC_ID_WADY_DPCM , AV_CODEC_ID_CBD2_DPCM , AV_CODEC_ID_MP2 = 0x15000, AV_CODEC_ID_MP3 , AV_CODEC_ID_AAC , AV_CODEC_ID_AC3 , AV_CODEC_ID_DTS , AV_CODEC_ID_VORBIS , AV_CODEC_ID_DVAUDIO , AV_CODEC_ID_WMAV1 , AV_CODEC_ID_WMAV2 , AV_CODEC_ID_MACE3 , AV_CODEC_ID_MACE6 , AV_CODEC_ID_VMDAUDIO , AV_CODEC_ID_FLAC , AV_CODEC_ID_MP3ADU , AV_CODEC_ID_MP3ON4 , AV_CODEC_ID_SHORTEN , AV_CODEC_ID_ALAC , AV_CODEC_ID_WESTWOOD_SND1 , AV_CODEC_ID_GSM , AV_CODEC_ID_QDM2 , AV_CODEC_ID_COOK , AV_CODEC_ID_TRUESPEECH , AV_CODEC_ID_TTA , AV_CODEC_ID_SMACKAUDIO , AV_CODEC_ID_QCELP , AV_CODEC_ID_WAVPACK , AV_CODEC_ID_DSICINAUDIO , AV_CODEC_ID_IMC , AV_CODEC_ID_MUSEPACK7 , AV_CODEC_ID_MLP , AV_CODEC_ID_GSM_MS , AV_CODEC_ID_ATRAC3 , AV_CODEC_ID_APE , AV_CODEC_ID_NELLYMOSER , AV_CODEC_ID_MUSEPACK8 , AV_CODEC_ID_SPEEX , AV_CODEC_ID_WMAVOICE , AV_CODEC_ID_WMAPRO , AV_CODEC_ID_WMALOSSLESS , AV_CODEC_ID_ATRAC3P , AV_CODEC_ID_EAC3 , AV_CODEC_ID_SIPR , AV_CODEC_ID_MP1 , AV_CODEC_ID_TWINVQ , AV_CODEC_ID_TRUEHD , AV_CODEC_ID_MP4ALS , AV_CODEC_ID_ATRAC1 , AV_CODEC_ID_BINKAUDIO_RDFT , AV_CODEC_ID_BINKAUDIO_DCT , AV_CODEC_ID_AAC_LATM , AV_CODEC_ID_QDMC , AV_CODEC_ID_CELT , AV_CODEC_ID_G723_1 , AV_CODEC_ID_G729 , AV_CODEC_ID_8SVX_EXP , AV_CODEC_ID_8SVX_FIB , AV_CODEC_ID_BMV_AUDIO , AV_CODEC_ID_RALF , AV_CODEC_ID_IAC , AV_CODEC_ID_ILBC , AV_CODEC_ID_OPUS , AV_CODEC_ID_COMFORT_NOISE , AV_CODEC_ID_TAK , AV_CODEC_ID_METASOUND , AV_CODEC_ID_PAF_AUDIO , AV_CODEC_ID_ON2AVC , AV_CODEC_ID_DSS_SP , AV_CODEC_ID_CODEC2 , AV_CODEC_ID_FFWAVESYNTH , AV_CODEC_ID_SONIC , AV_CODEC_ID_SONIC_LS , AV_CODEC_ID_EVRC , AV_CODEC_ID_SMV , AV_CODEC_ID_DSD_LSBF , AV_CODEC_ID_DSD_MSBF , AV_CODEC_ID_DSD_LSBF_PLANAR , AV_CODEC_ID_DSD_MSBF_PLANAR , AV_CODEC_ID_4GV , AV_CODEC_ID_INTERPLAY_ACM , AV_CODEC_ID_XMA1 , AV_CODEC_ID_XMA2 , AV_CODEC_ID_DST , AV_CODEC_ID_ATRAC3AL , AV_CODEC_ID_ATRAC3PAL , AV_CODEC_ID_DOLBY_E , AV_CODEC_ID_APTX , AV_CODEC_ID_APTX_HD , AV_CODEC_ID_SBC , AV_CODEC_ID_ATRAC9 , AV_CODEC_ID_HCOM , AV_CODEC_ID_ACELP_KELVIN , AV_CODEC_ID_MPEGH_3D_AUDIO , AV_CODEC_ID_SIREN , AV_CODEC_ID_HCA , AV_CODEC_ID_FASTAUDIO , AV_CODEC_ID_MSNSIREN , AV_CODEC_ID_DFPWM , AV_CODEC_ID_BONK , AV_CODEC_ID_MISC4 , AV_CODEC_ID_APAC , AV_CODEC_ID_FTR , AV_CODEC_ID_WAVARC , AV_CODEC_ID_RKA , AV_CODEC_ID_AC4 , AV_CODEC_ID_OSQ , AV_CODEC_ID_FIRST_SUBTITLE = 0x17000, AV_CODEC_ID_DVD_SUBTITLE = 0x17000, AV_CODEC_ID_DVB_SUBTITLE , AV_CODEC_ID_TEXT , AV_CODEC_ID_XSUB , AV_CODEC_ID_SSA , AV_CODEC_ID_MOV_TEXT , AV_CODEC_ID_HDMV_PGS_SUBTITLE , AV_CODEC_ID_DVB_TELETEXT , AV_CODEC_ID_SRT , AV_CODEC_ID_MICRODVD , AV_CODEC_ID_EIA_608 , AV_CODEC_ID_JACOSUB , AV_CODEC_ID_SAMI , AV_CODEC_ID_REALTEXT , AV_CODEC_ID_STL , AV_CODEC_ID_SUBVIEWER1 , AV_CODEC_ID_SUBVIEWER , AV_CODEC_ID_SUBRIP , AV_CODEC_ID_WEBVTT , AV_CODEC_ID_MPL2 , AV_CODEC_ID_VPLAYER , AV_CODEC_ID_PJS , AV_CODEC_ID_ASS , AV_CODEC_ID_HDMV_TEXT_SUBTITLE , AV_CODEC_ID_TTML , AV_CODEC_ID_ARIB_CAPTION , AV_CODEC_ID_FIRST_UNKNOWN = 0x18000, AV_CODEC_ID_TTF = 0x18000, AV_CODEC_ID_SCTE_35 , AV_CODEC_ID_EPG , AV_CODEC_ID_BINTEXT , AV_CODEC_ID_XBIN , AV_CODEC_ID_IDF , AV_CODEC_ID_OTF , AV_CODEC_ID_SMPTE_KLV , AV_CODEC_ID_DVD_NAV , AV_CODEC_ID_TIMED_ID3 , AV_CODEC_ID_BIN_DATA , AV_CODEC_ID_SMPTE_2038 , AV_CODEC_ID_PROBE = 0x19000, AV_CODEC_ID_MPEG2TS = 0x20000, AV_CODEC_ID_MPEG4SYSTEMS = 0x20001, AV_CODEC_ID_FFMETADATA = 0x21000, AV_CODEC_ID_WRAPPED_AVFRAME = 0x21001, AV_CODEC_ID_VNULL , AV_CODEC_ID_ANULL Identify the syntax and semantics of the bitstream. More...
Functions unsigned avcodec_version (void)  Return the LIBAVCODEC_VERSION_INT constant. More...
const char * avcodec_configuration (void)  Return the libavcodec build-time configuration. More...
const char * avcodec_license (void)  Return the libavcodec license. More...
AVCodecContext * avcodec_alloc_context3 (const AVCodec *codec)  Allocate an AVCodecContext and set its fields to default values. More...
void avcodec_free_context ( AVCodecContext **avctx)  Free the codec context and everything associated with it and write NULL to the provided pointer. More...
const AVClass * avcodec_get_class (void)  Get the AVClass for AVCodecContext . More...
const AVClass * avcodec_get_subtitle_rect_class (void)  Get the AVClass for AVSubtitleRect . More...
int avcodec_parameters_from_context (struct AVCodecParameters *par, const AVCodecContext *codec) Fill the parameters struct based on the values from the supplied codec context. More...
int avcodec_parameters_to_context ( AVCodecContext *codec, const struct AVCodecParameters *par) Fill the codec context based on the values from the supplied codec parameters. More...
int avcodec_open2 ( AVCodecContext *avctx, const AVCodec *codec, AVDictionary ** options )  Initialize the AVCodecContext to use the given AVCodec . More...
int avcodec_close ( AVCodecContext *avctx)  Close a given AVCodecContext and free all the data associated with it (but not the AVCodecContext itself). More...
void avsubtitle_free ( AVSubtitle *sub)  Free all allocated data in the given subtitle struct. More...
const AVCodec * av_codec_iterate (void **opaque)  Iterate over all registered codecs. More...
const AVCodec * avcodec_find_decoder (enum AVCodecID id )  Find a registered decoder with a matching codec ID. More...
const AVCodec * avcodec_find_decoder_by_name (const char * name )  Find a registered decoder with the specified name. More...
const AVCodec * avcodec_find_encoder (enum AVCodecID id )  Find a registered encoder with a matching codec ID. More...
const AVCodec * avcodec_find_encoder_by_name (const char * name )  Find a registered encoder with the specified name. More...
int av_codec_is_encoder (const AVCodec *codec) int av_codec_is_decoder (const AVCodec *codec) const char * av_get_profile_name (const AVCodec *codec, int profile )  Return a name for the specified profile, if available. More...
const AVCodecHWConfig * avcodec_get_hw_config (const AVCodec *codec, int index )  Retrieve supported hardware configurations for a codec. More...
const AVCodecDescriptor * avcodec_descriptor_get (enum AVCodecID id ) const AVCodecDescriptor * avcodec_descriptor_next (const AVCodecDescriptor *prev)  Iterate over all codec descriptors known to libavcodec. More...
const AVCodecDescriptor * avcodec_descriptor_get_by_name (const char * name ) enum AVMediaType avcodec_get_type (enum AVCodecID codec_id )  Get the type of the given codec. More...
const char * avcodec_get_name (enum AVCodecID id )  Get the name of a codec. More...
int av_get_bits_per_sample (enum AVCodecID codec_id )  Return codec bits per sample. More...
int av_get_exact_bits_per_sample (enum AVCodecID codec_id )  Return codec bits per sample. More...
const char * avcodec_profile_name (enum AVCodecID codec_id , int profile )  Return a name for the specified profile, if available. More...
enum AVCodecID av_get_pcm_codec (enum AVSampleFormat fmt, int be )  Return the PCM codec associated with a sample format. More...
AVCodecParameters * avcodec_parameters_alloc (void)  Allocate a new AVCodecParameters and set its fields to default values (unknown/invalid/0). More...
void avcodec_parameters_free ( AVCodecParameters **par)  Free an AVCodecParameters instance and everything associated with it and write NULL to the supplied pointer. More...
int avcodec_parameters_copy ( AVCodecParameters *dst, const AVCodecParameters * src )  Copy the contents of src to dst. More...
int av_get_audio_frame_duration2 ( AVCodecParameters *par, int frame_bytes)  This function is the same as av_get_audio_frame_duration() , except it works with AVCodecParameters instead of an AVCodecContext . More...

Detailed Description

Basic definitions, functions for querying libavcodec capabilities, allocating core structures, etc.

Macro Definition Documentation

◆ AV_CODEC_FLAG_UNALIGNED

Allow decoders to produce frames with data planes that are not aligned to CPU requirements (e.g.

due to cropping).

Definition at line 216 of file avcodec.h .

Don't output frames whose parameters differ from first decoded frame in stream.

Deprecated:

callers should implement this functionality in their own code

Definition at line 240 of file avcodec.h .

Request the encoder to output reconstructed frames, i.e. frames that would be produced by decoding the encoded bistream.

These frames may be retrieved by calling avcodec_receive_frame() immediately after a successful call to avcodec_receive_packet() .

Should only be used with encoders flagged with the AV_CODEC_CAP_ENCODER_RECON_FRAME capability.

Note

Each reconstructed frame returned by the encoder corresponds to the last encoded packet, i.e. the frames are returned in coded order rather than presentation order.

Frame parameters (like pixel format or dimensions) do not have to match the AVCodecContext values. Make sure to use the values from the returned frame.

Definition at line 260 of file avcodec.h .

decoding

Request the decoder to propagate each packet's AVPacket.opaque and AVPacket.opaque_ref to its corresponding output AVFrame .

encoding:

Request the encoder to propagate each frame's AVFrame.opaque and AVFrame.opaque_ref values to its corresponding output AVPacket .

May only be set on encoders that have the AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE capability flag.

Note

While in typical cases one input frame produces exactly one output packet (perhaps after a delay), in general the mapping of frames to packets is M-to-N, so

• Any number of input frames may be associated with any given output packet. This includes zero - e.g. some encoders may output packets that carry only metadata about the whole stream.
• A given input frame may be associated with any number of output packets. Again this includes zero - e.g. some encoders may drop frames under certain conditions.
This implies that when using this flag, the caller must NOT assume that
• a given input frame's opaques will necessarily appear on some output packet;
• every output packet will have some non-NULL opaque value.
When an output packet contains multiple frames, the opaque values will be taken from the first of those.

The converse holds for decoders, with frames and packets switched.

Definition at line 295 of file avcodec.h .

Signal to the encoder that the values of AVFrame.duration are valid and should be used (typically for transferring them to output packets).

If this flag is not set, frame durations are ignored.

Definition at line 302 of file avcodec.h .

Place global headers in extradata instead of every keyframe.

Examples

mux.c , transcode.c , and transcode_aac.c .

Definition at line 334 of file avcodec.h .

Input bitstream might be truncated at a packet boundaries instead of only at frame boundaries.

Definition at line 367 of file avcodec.h .

Generate/parse ICC profiles on encode/decode, as appropriate for the type of file.

No effect on codecs which cannot contain embedded ICC profiles, or when compiled without support for lcms2.

Definition at line 394 of file avcodec.h .

Codec uses get_buffer() or get_encode_buffer() for allocating buffers and supports custom allocators.

If not set, it might not use get_buffer() or get_encode_buffer() at all, or use operations that assume the buffer was allocated by avcodec_default_get_buffer2 or avcodec_default_get_encode_buffer.

Definition at line 52 of file codec.h .

Encoder or decoder requires flushing with NULL input at the end in order to give the complete and correct output.

NOTE: If this flag is not set, the codec is guaranteed to never be fed with with NULL data. The user can still send NULL data to the public encode or decode function, but libavcodec will not pass it along to the codec unless this flag is set.

Decoders: The decoder has a non-zero delay and needs to be fed with avpkt->data=NULL, avpkt->size=0 at the end to get the delayed data until the decoder no longer returns frames.

Encoders: The encoder needs to be fed with NULL data at the end of encoding until the encoder no longer returns data.

NOTE: For encoders implementing the AVCodec.encode2() function, setting this flag also means that the encoder must set the pts and duration for each output packet. If this flag is not set, the pts and duration will be determined by libavcodec from the input frame.

Examples

transcode.c .

Definition at line 76 of file codec.h .

Codec can be fed a final frame with a smaller size.

This can be used to prevent truncation of the last audio samples.

Definition at line 81 of file codec.h .

Codec supports multithreading through a method other than slice- or frame-level multithreading.

Typically this marks wrappers around multithreading-capable external libraries.

Definition at line 124 of file codec.h .

Audio encoder supports receiving a different number of samples in each call.

Examples

mux.c .

Definition at line 128 of file codec.h .

Decoder is not a preferred choice for probing.

This indicates that the decoder is not a good choice for probing. It could for example be an expensive to spin up hardware decoder, or it could simply not provide a lot of useful information about the stream. A decoder marked with this flag should only be used as last resort choice for probing.

Definition at line 138 of file codec.h .

Codec is backed by a hardware implementation.

Typically used to identify a non-hwaccel hardware decoder. For information about hwaccels, use avcodec_get_hw_config() instead.

Definition at line 145 of file codec.h .

Codec is potentially backed by a hardware implementation, but not necessarily.

This is used instead of AV_CODEC_CAP_HARDWARE, if the implementation provides some sort of internal fallback.

Definition at line 152 of file codec.h .

This encoder can reorder user opaque values from input AVFrames and return them with corresponding output packets.

See also

AV_CODEC_FLAG_COPY_OPAQUE

Definition at line 159 of file codec.h .

This encoder can be flushed using avcodec_flush_buffers() .

If this flag is not set, the encoder must be closed and reopened to ensure that no frames remain pending.

Definition at line 166 of file codec.h .

The encoder is able to output reconstructed frame data, i.e.

raw frames that would be produced by decoding the encoded bitstream.

Reconstructed frame output is enabled by the AV_CODEC_FLAG_RECON_FRAME flag.

Definition at line 174 of file codec.h .

Codec supports lossy compression.

Audio and video codecs only.

Note

a codec may support both lossy and lossless compression modes

Definition at line 78 of file codec_desc.h .

Codec supports frame reordering.

That is, the coded order (the order in which the encoded packets are output by the encoders / stored / input to the decoders) may be different from the presentation order of the corresponding frames.

For codecs that do not have this property set, PTS and DTS should always be equal.

Definition at line 92 of file codec_desc.h .

Subtitle codec is bitmap based Decoded AVSubtitle data can be read from the AVSubtitleRect->pict field.

Definition at line 103 of file codec_desc.h .

Subtitle codec is text based.

Decoded AVSubtitle data can be read from the AVSubtitleRect->ass field.

Definition at line 108 of file codec_desc.h .

Enumeration Type Documentation

◆ AVSubtitleType

SUBTITLE_BITMAP

A bitmap, pict will be set.

SUBTITLE_TEXT

Plain text, the text field must be set by the decoder and is authoritative.

ass and pict fields may contain approximations.

SUBTITLE_ASS

Formatted text, the ass field must be set by the decoder and is authoritative.

pict and text fields may contain approximations.

Definition at line 2221 of file avcodec.h .

Enumerator AV_CODEC_HW_CONFIG_METHOD_HW_DEVICE_CTX

The codec supports this format via the hw_device_ctx interface.

When selecting this format, AVCodecContext.hw_device_ctx should have been set to a device of the specified type before calling avcodec_open2() .

AV_CODEC_HW_CONFIG_METHOD_HW_FRAMES_CTX

The codec supports this format via the hw_frames_ctx interface.

When selecting this format for a decoder, AVCodecContext.hw_frames_ctx should be set to a suitable frames context inside the get_format() callback. The frames context must have been created on a device of the specified type.

When selecting this format for an encoder, AVCodecContext.hw_frames_ctx should be set to the context which will be used for the input frames before calling avcodec_open2() .

AV_CODEC_HW_CONFIG_METHOD_INTERNAL

The codec supports this format by some internal method.

This format can be selected without any additional configuration - no device or frames context is required.

AV_CODEC_HW_CONFIG_METHOD_AD_HOC

The codec supports this format by some ad-hoc method.

Additional settings and/or function calls are required. See the codec-specific documentation for details. (Methods requiring this sort of configuration are deprecated and others should be used in preference.)

Definition at line 301 of file codec.h .

Identify the syntax and semantics of the bitstream.

The principle is roughly: Two decoders with the same ID can decode the same streams. Two encoders with the same ID can encode compatible streams. There may be slight deviations from the principle due to implementation details.

If you add a codec ID to this list, add it so that

1. no value of an existing codec ID changes (that would break ABI),
2. it is as close as possible to similar codecs

After adding new codec IDs, do not forget to add an entry to the codec descriptor list and bump libavcodec minor version.

Enumerator AV_CODEC_ID_NONE AV_CODEC_ID_MPEG1VIDEO AV_CODEC_ID_MPEG2VIDEO

preferred ID for MPEG-1/2 video decoding

AV_CODEC_ID_H261 AV_CODEC_ID_H263 AV_CODEC_ID_RV10 AV_CODEC_ID_RV20 AV_CODEC_ID_MJPEG AV_CODEC_ID_MJPEGB AV_CODEC_ID_LJPEG AV_CODEC_ID_SP5X AV_CODEC_ID_JPEGLS AV_CODEC_ID_MPEG4 AV_CODEC_ID_RAWVIDEO AV_CODEC_ID_MSMPEG4V1 AV_CODEC_ID_MSMPEG4V2 AV_CODEC_ID_MSMPEG4V3 AV_CODEC_ID_WMV1 AV_CODEC_ID_WMV2 AV_CODEC_ID_H263P AV_CODEC_ID_H263I AV_CODEC_ID_FLV1 AV_CODEC_ID_SVQ1 AV_CODEC_ID_SVQ3 AV_CODEC_ID_DVVIDEO AV_CODEC_ID_HUFFYUV AV_CODEC_ID_CYUV AV_CODEC_ID_H264 AV_CODEC_ID_INDEO3 AV_CODEC_ID_VP3 AV_CODEC_ID_THEORA AV_CODEC_ID_ASV1 AV_CODEC_ID_ASV2 AV_CODEC_ID_FFV1 AV_CODEC_ID_4XM AV_CODEC_ID_VCR1 AV_CODEC_ID_CLJR AV_CODEC_ID_MDEC AV_CODEC_ID_ROQ AV_CODEC_ID_INTERPLAY_VIDEO AV_CODEC_ID_XAN_WC3 AV_CODEC_ID_XAN_WC4 AV_CODEC_ID_RPZA AV_CODEC_ID_CINEPAK AV_CODEC_ID_WS_VQA AV_CODEC_ID_MSRLE AV_CODEC_ID_MSVIDEO1 AV_CODEC_ID_IDCIN AV_CODEC_ID_8BPS AV_CODEC_ID_SMC AV_CODEC_ID_FLIC AV_CODEC_ID_TRUEMOTION1 AV_CODEC_ID_VMDVIDEO AV_CODEC_ID_MSZH AV_CODEC_ID_ZLIB AV_CODEC_ID_QTRLE AV_CODEC_ID_TSCC AV_CODEC_ID_ULTI AV_CODEC_ID_QDRAW AV_CODEC_ID_VIXL AV_CODEC_ID_QPEG AV_CODEC_ID_PNG AV_CODEC_ID_PPM AV_CODEC_ID_PBM AV_CODEC_ID_PGM AV_CODEC_ID_PGMYUV AV_CODEC_ID_PAM AV_CODEC_ID_FFVHUFF AV_CODEC_ID_RV30 AV_CODEC_ID_RV40 AV_CODEC_ID_VC1 AV_CODEC_ID_WMV3 AV_CODEC_ID_LOCO AV_CODEC_ID_WNV1 AV_CODEC_ID_AASC AV_CODEC_ID_INDEO2 AV_CODEC_ID_FRAPS AV_CODEC_ID_TRUEMOTION2 AV_CODEC_ID_BMP AV_CODEC_ID_CSCD AV_CODEC_ID_MMVIDEO AV_CODEC_ID_ZMBV AV_CODEC_ID_AVS AV_CODEC_ID_SMACKVIDEO AV_CODEC_ID_NUV AV_CODEC_ID_KMVC AV_CODEC_ID_FLASHSV AV_CODEC_ID_CAVS AV_CODEC_ID_JPEG2000 AV_CODEC_ID_VMNC AV_CODEC_ID_VP5 AV_CODEC_ID_VP6 AV_CODEC_ID_VP6F AV_CODEC_ID_TARGA AV_CODEC_ID_DSICINVIDEO AV_CODEC_ID_TIERTEXSEQVIDEO AV_CODEC_ID_TIFF AV_CODEC_ID_GIF AV_CODEC_ID_DXA AV_CODEC_ID_DNXHD AV_CODEC_ID_THP AV_CODEC_ID_SGI AV_CODEC_ID_C93 AV_CODEC_ID_BETHSOFTVID AV_CODEC_ID_PTX AV_CODEC_ID_TXD AV_CODEC_ID_VP6A AV_CODEC_ID_AMV AV_CODEC_ID_VB AV_CODEC_ID_PCX AV_CODEC_ID_SUNRAST AV_CODEC_ID_INDEO4 AV_CODEC_ID_INDEO5 AV_CODEC_ID_MIMIC AV_CODEC_ID_RL2 AV_CODEC_ID_ESCAPE124 AV_CODEC_ID_DIRAC AV_CODEC_ID_BFI AV_CODEC_ID_CMV AV_CODEC_ID_MOTIONPIXELS AV_CODEC_ID_TGV AV_CODEC_ID_TGQ AV_CODEC_ID_TQI AV_CODEC_ID_AURA AV_CODEC_ID_AURA2 AV_CODEC_ID_V210X AV_CODEC_ID_TMV AV_CODEC_ID_V210 AV_CODEC_ID_DPX AV_CODEC_ID_MAD AV_CODEC_ID_FRWU AV_CODEC_ID_FLASHSV2 AV_CODEC_ID_CDGRAPHICS AV_CODEC_ID_R210 AV_CODEC_ID_ANM AV_CODEC_ID_BINKVIDEO AV_CODEC_ID_IFF_ILBM AV_CODEC_ID_KGV1 AV_CODEC_ID_YOP AV_CODEC_ID_VP8 AV_CODEC_ID_PICTOR AV_CODEC_ID_ANSI AV_CODEC_ID_A64_MULTI AV_CODEC_ID_A64_MULTI5 AV_CODEC_ID_R10K AV_CODEC_ID_MXPEG AV_CODEC_ID_LAGARITH AV_CODEC_ID_PRORES AV_CODEC_ID_JV AV_CODEC_ID_DFA AV_CODEC_ID_WMV3IMAGE AV_CODEC_ID_VC1IMAGE AV_CODEC_ID_UTVIDEO AV_CODEC_ID_BMV_VIDEO AV_CODEC_ID_VBLE AV_CODEC_ID_DXTORY AV_CODEC_ID_V410 AV_CODEC_ID_XWD AV_CODEC_ID_CDXL AV_CODEC_ID_XBM AV_CODEC_ID_ZEROCODEC AV_CODEC_ID_MSS1 AV_CODEC_ID_MSA1 AV_CODEC_ID_TSCC2 AV_CODEC_ID_MTS2 AV_CODEC_ID_CLLC AV_CODEC_ID_MSS2 AV_CODEC_ID_VP9 AV_CODEC_ID_AIC AV_CODEC_ID_ESCAPE130 AV_CODEC_ID_G2M AV_CODEC_ID_WEBP AV_CODEC_ID_HNM4_VIDEO AV_CODEC_ID_HEVC AV_CODEC_ID_FIC AV_CODEC_ID_ALIAS_PIX AV_CODEC_ID_BRENDER_PIX AV_CODEC_ID_PAF_VIDEO AV_CODEC_ID_EXR AV_CODEC_ID_VP7 AV_CODEC_ID_SANM AV_CODEC_ID_SGIRLE AV_CODEC_ID_MVC1 AV_CODEC_ID_MVC2 AV_CODEC_ID_HQX AV_CODEC_ID_TDSC AV_CODEC_ID_HQ_HQA AV_CODEC_ID_HAP AV_CODEC_ID_DDS AV_CODEC_ID_DXV AV_CODEC_ID_SCREENPRESSO AV_CODEC_ID_RSCC AV_CODEC_ID_AVS2 AV_CODEC_ID_PGX AV_CODEC_ID_AVS3 AV_CODEC_ID_MSP2 AV_CODEC_ID_VVC AV_CODEC_ID_Y41P AV_CODEC_ID_AVRP AV_CODEC_ID_012V AV_CODEC_ID_AVUI AV_CODEC_ID_AYUV AV_CODEC_ID_TARGA_Y216 AV_CODEC_ID_V308 AV_CODEC_ID_V408 AV_CODEC_ID_YUV4 AV_CODEC_ID_AVRN AV_CODEC_ID_CPIA AV_CODEC_ID_XFACE AV_CODEC_ID_SNOW AV_CODEC_ID_SMVJPEG AV_CODEC_ID_APNG AV_CODEC_ID_DAALA AV_CODEC_ID_CFHD AV_CODEC_ID_TRUEMOTION2RT AV_CODEC_ID_M101 AV_CODEC_ID_MAGICYUV AV_CODEC_ID_SHEERVIDEO AV_CODEC_ID_YLC AV_CODEC_ID_PSD AV_CODEC_ID_PIXLET AV_CODEC_ID_SPEEDHQ AV_CODEC_ID_FMVC AV_CODEC_ID_SCPR AV_CODEC_ID_CLEARVIDEO AV_CODEC_ID_XPM AV_CODEC_ID_AV1 AV_CODEC_ID_BITPACKED AV_CODEC_ID_MSCC AV_CODEC_ID_SRGC AV_CODEC_ID_SVG AV_CODEC_ID_GDV AV_CODEC_ID_FITS AV_CODEC_ID_IMM4 AV_CODEC_ID_PROSUMER AV_CODEC_ID_MWSC AV_CODEC_ID_WCMV AV_CODEC_ID_RASC AV_CODEC_ID_HYMT AV_CODEC_ID_ARBC AV_CODEC_ID_AGM AV_CODEC_ID_LSCR AV_CODEC_ID_VP4 AV_CODEC_ID_IMM5 AV_CODEC_ID_MVDV AV_CODEC_ID_MVHA AV_CODEC_ID_CDTOONS AV_CODEC_ID_MV30 AV_CODEC_ID_NOTCHLC AV_CODEC_ID_PFM AV_CODEC_ID_MOBICLIP AV_CODEC_ID_PHOTOCD AV_CODEC_ID_IPU AV_CODEC_ID_ARGO AV_CODEC_ID_CRI AV_CODEC_ID_SIMBIOSIS_IMX AV_CODEC_ID_SGA_VIDEO AV_CODEC_ID_GEM AV_CODEC_ID_VBN AV_CODEC_ID_JPEGXL AV_CODEC_ID_QOI AV_CODEC_ID_PHM AV_CODEC_ID_RADIANCE_HDR AV_CODEC_ID_WBMP AV_CODEC_ID_MEDIA100 AV_CODEC_ID_VQC AV_CODEC_ID_PDV AV_CODEC_ID_EVC AV_CODEC_ID_RTV1 AV_CODEC_ID_VMIX AV_CODEC_ID_FIRST_AUDIO

A dummy id pointing at the start of audio codecs.

AV_CODEC_ID_PCM_S16LE AV_CODEC_ID_PCM_S16BE AV_CODEC_ID_PCM_U16LE AV_CODEC_ID_PCM_U16BE AV_CODEC_ID_PCM_S8 AV_CODEC_ID_PCM_U8 AV_CODEC_ID_PCM_MULAW AV_CODEC_ID_PCM_ALAW AV_CODEC_ID_PCM_S32LE AV_CODEC_ID_PCM_S32BE AV_CODEC_ID_PCM_U32LE AV_CODEC_ID_PCM_U32BE AV_CODEC_ID_PCM_S24LE AV_CODEC_ID_PCM_S24BE AV_CODEC_ID_PCM_U24LE AV_CODEC_ID_PCM_U24BE AV_CODEC_ID_PCM_S24DAUD AV_CODEC_ID_PCM_ZORK AV_CODEC_ID_PCM_S16LE_PLANAR AV_CODEC_ID_PCM_DVD AV_CODEC_ID_PCM_F32BE AV_CODEC_ID_PCM_F32LE AV_CODEC_ID_PCM_F64BE AV_CODEC_ID_PCM_F64LE AV_CODEC_ID_PCM_BLURAY AV_CODEC_ID_PCM_LXF AV_CODEC_ID_S302M AV_CODEC_ID_PCM_S8_PLANAR AV_CODEC_ID_PCM_S24LE_PLANAR AV_CODEC_ID_PCM_S32LE_PLANAR AV_CODEC_ID_PCM_S16BE_PLANAR AV_CODEC_ID_PCM_S64LE AV_CODEC_ID_PCM_S64BE AV_CODEC_ID_PCM_F16LE AV_CODEC_ID_PCM_F24LE AV_CODEC_ID_PCM_VIDC AV_CODEC_ID_PCM_SGA AV_CODEC_ID_ADPCM_IMA_QT AV_CODEC_ID_ADPCM_IMA_WAV AV_CODEC_ID_ADPCM_IMA_DK3 AV_CODEC_ID_ADPCM_IMA_DK4 AV_CODEC_ID_ADPCM_IMA_WS AV_CODEC_ID_ADPCM_IMA_SMJPEG AV_CODEC_ID_ADPCM_MS AV_CODEC_ID_ADPCM_4XM AV_CODEC_ID_ADPCM_XA AV_CODEC_ID_ADPCM_ADX AV_CODEC_ID_ADPCM_EA AV_CODEC_ID_ADPCM_G726 AV_CODEC_ID_ADPCM_CT AV_CODEC_ID_ADPCM_SWF AV_CODEC_ID_ADPCM_YAMAHA AV_CODEC_ID_ADPCM_SBPRO_4 AV_CODEC_ID_ADPCM_SBPRO_3 AV_CODEC_ID_ADPCM_SBPRO_2 AV_CODEC_ID_ADPCM_THP AV_CODEC_ID_ADPCM_IMA_AMV AV_CODEC_ID_ADPCM_EA_R1 AV_CODEC_ID_ADPCM_EA_R3 AV_CODEC_ID_ADPCM_EA_R2 AV_CODEC_ID_ADPCM_IMA_EA_SEAD AV_CODEC_ID_ADPCM_IMA_EA_EACS AV_CODEC_ID_ADPCM_EA_XAS AV_CODEC_ID_ADPCM_EA_MAXIS_XA AV_CODEC_ID_ADPCM_IMA_ISS AV_CODEC_ID_ADPCM_G722 AV_CODEC_ID_ADPCM_IMA_APC AV_CODEC_ID_ADPCM_VIMA AV_CODEC_ID_ADPCM_AFC AV_CODEC_ID_ADPCM_IMA_OKI AV_CODEC_ID_ADPCM_DTK AV_CODEC_ID_ADPCM_IMA_RAD AV_CODEC_ID_ADPCM_G726LE AV_CODEC_ID_ADPCM_THP_LE AV_CODEC_ID_ADPCM_PSX AV_CODEC_ID_ADPCM_AICA AV_CODEC_ID_ADPCM_IMA_DAT4 AV_CODEC_ID_ADPCM_MTAF AV_CODEC_ID_ADPCM_AGM AV_CODEC_ID_ADPCM_ARGO AV_CODEC_ID_ADPCM_IMA_SSI AV_CODEC_ID_ADPCM_ZORK AV_CODEC_ID_ADPCM_IMA_APM AV_CODEC_ID_ADPCM_IMA_ALP AV_CODEC_ID_ADPCM_IMA_MTF AV_CODEC_ID_ADPCM_IMA_CUNNING AV_CODEC_ID_ADPCM_IMA_MOFLEX AV_CODEC_ID_ADPCM_IMA_ACORN AV_CODEC_ID_ADPCM_XMD AV_CODEC_ID_AMR_NB AV_CODEC_ID_AMR_WB AV_CODEC_ID_RA_144 AV_CODEC_ID_RA_288 AV_CODEC_ID_ROQ_DPCM AV_CODEC_ID_INTERPLAY_DPCM AV_CODEC_ID_XAN_DPCM AV_CODEC_ID_SOL_DPCM AV_CODEC_ID_SDX2_DPCM AV_CODEC_ID_GREMLIN_DPCM AV_CODEC_ID_DERF_DPCM AV_CODEC_ID_WADY_DPCM AV_CODEC_ID_CBD2_DPCM AV_CODEC_ID_MP2 AV_CODEC_ID_MP3

preferred ID for decoding MPEG audio layer 1, 2 or 3

AV_CODEC_ID_AAC AV_CODEC_ID_AC3 AV_CODEC_ID_DTS AV_CODEC_ID_VORBIS AV_CODEC_ID_DVAUDIO AV_CODEC_ID_WMAV1 AV_CODEC_ID_WMAV2 AV_CODEC_ID_MACE3 AV_CODEC_ID_MACE6 AV_CODEC_ID_VMDAUDIO AV_CODEC_ID_FLAC AV_CODEC_ID_MP3ADU AV_CODEC_ID_MP3ON4 AV_CODEC_ID_SHORTEN AV_CODEC_ID_ALAC AV_CODEC_ID_WESTWOOD_SND1 AV_CODEC_ID_GSM

as in Berlin toast format

AV_CODEC_ID_QDM2 AV_CODEC_ID_COOK AV_CODEC_ID_TRUESPEECH AV_CODEC_ID_TTA AV_CODEC_ID_SMACKAUDIO AV_CODEC_ID_QCELP AV_CODEC_ID_WAVPACK AV_CODEC_ID_DSICINAUDIO AV_CODEC_ID_IMC AV_CODEC_ID_MUSEPACK7 AV_CODEC_ID_MLP AV_CODEC_ID_GSM_MS AV_CODEC_ID_ATRAC3 AV_CODEC_ID_APE AV_CODEC_ID_NELLYMOSER AV_CODEC_ID_MUSEPACK8 AV_CODEC_ID_SPEEX AV_CODEC_ID_WMAVOICE AV_CODEC_ID_WMAPRO AV_CODEC_ID_WMALOSSLESS AV_CODEC_ID_ATRAC3P AV_CODEC_ID_EAC3 AV_CODEC_ID_SIPR AV_CODEC_ID_MP1 AV_CODEC_ID_TWINVQ AV_CODEC_ID_TRUEHD AV_CODEC_ID_MP4ALS AV_CODEC_ID_ATRAC1 AV_CODEC_ID_BINKAUDIO_RDFT AV_CODEC_ID_BINKAUDIO_DCT AV_CODEC_ID_AAC_LATM AV_CODEC_ID_QDMC AV_CODEC_ID_CELT AV_CODEC_ID_G723_1 AV_CODEC_ID_G729 AV_CODEC_ID_8SVX_EXP AV_CODEC_ID_8SVX_FIB AV_CODEC_ID_BMV_AUDIO AV_CODEC_ID_RALF AV_CODEC_ID_IAC AV_CODEC_ID_ILBC AV_CODEC_ID_OPUS AV_CODEC_ID_COMFORT_NOISE AV_CODEC_ID_TAK AV_CODEC_ID_METASOUND AV_CODEC_ID_PAF_AUDIO AV_CODEC_ID_ON2AVC AV_CODEC_ID_DSS_SP AV_CODEC_ID_CODEC2 AV_CODEC_ID_FFWAVESYNTH AV_CODEC_ID_SONIC AV_CODEC_ID_SONIC_LS AV_CODEC_ID_EVRC AV_CODEC_ID_SMV AV_CODEC_ID_DSD_LSBF AV_CODEC_ID_DSD_MSBF AV_CODEC_ID_DSD_LSBF_PLANAR AV_CODEC_ID_DSD_MSBF_PLANAR AV_CODEC_ID_4GV AV_CODEC_ID_INTERPLAY_ACM AV_CODEC_ID_XMA1 AV_CODEC_ID_XMA2 AV_CODEC_ID_DST AV_CODEC_ID_ATRAC3AL AV_CODEC_ID_ATRAC3PAL AV_CODEC_ID_DOLBY_E AV_CODEC_ID_APTX AV_CODEC_ID_APTX_HD AV_CODEC_ID_SBC AV_CODEC_ID_ATRAC9 AV_CODEC_ID_HCOM AV_CODEC_ID_ACELP_KELVIN AV_CODEC_ID_MPEGH_3D_AUDIO AV_CODEC_ID_SIREN AV_CODEC_ID_HCA AV_CODEC_ID_FASTAUDIO AV_CODEC_ID_MSNSIREN AV_CODEC_ID_DFPWM AV_CODEC_ID_BONK AV_CODEC_ID_MISC4 AV_CODEC_ID_APAC AV_CODEC_ID_FTR AV_CODEC_ID_WAVARC AV_CODEC_ID_RKA AV_CODEC_ID_AC4 AV_CODEC_ID_OSQ AV_CODEC_ID_FIRST_SUBTITLE

A dummy ID pointing at the start of subtitle codecs.

AV_CODEC_ID_DVD_SUBTITLE AV_CODEC_ID_DVB_SUBTITLE AV_CODEC_ID_TEXT

raw UTF-8 text

AV_CODEC_ID_XSUB AV_CODEC_ID_SSA AV_CODEC_ID_MOV_TEXT AV_CODEC_ID_HDMV_PGS_SUBTITLE AV_CODEC_ID_DVB_TELETEXT AV_CODEC_ID_SRT AV_CODEC_ID_MICRODVD AV_CODEC_ID_EIA_608 AV_CODEC_ID_JACOSUB AV_CODEC_ID_SAMI AV_CODEC_ID_REALTEXT AV_CODEC_ID_STL AV_CODEC_ID_SUBVIEWER1 AV_CODEC_ID_SUBVIEWER AV_CODEC_ID_SUBRIP AV_CODEC_ID_WEBVTT AV_CODEC_ID_MPL2 AV_CODEC_ID_VPLAYER AV_CODEC_ID_PJS AV_CODEC_ID_ASS AV_CODEC_ID_HDMV_TEXT_SUBTITLE AV_CODEC_ID_TTML AV_CODEC_ID_ARIB_CAPTION AV_CODEC_ID_FIRST_UNKNOWN

A dummy ID pointing at the start of various fake codecs.

AV_CODEC_ID_TTF AV_CODEC_ID_SCTE_35

Contain timestamp estimated through PCR of program stream.

AV_CODEC_ID_EPG AV_CODEC_ID_BINTEXT AV_CODEC_ID_XBIN AV_CODEC_ID_IDF AV_CODEC_ID_OTF AV_CODEC_ID_SMPTE_KLV AV_CODEC_ID_DVD_NAV AV_CODEC_ID_TIMED_ID3 AV_CODEC_ID_BIN_DATA AV_CODEC_ID_SMPTE_2038 AV_CODEC_ID_PROBE

codec_id is not known (like AV_CODEC_ID_NONE) but lavf should attempt to identify it

AV_CODEC_ID_MPEG2TS

FAKE codec to indicate a raw MPEG-2 TS stream (only used by libavformat)

AV_CODEC_ID_MPEG4SYSTEMS

FAKE codec to indicate a MPEG-4 Systems stream (only used by libavformat)

AV_CODEC_ID_FFMETADATA

Dummy codec for streams containing only metadata information.

AV_CODEC_ID_WRAPPED_AVFRAME

Passthrough codec, AVFrames wrapped in AVPacket .

AV_CODEC_ID_VNULL

Dummy null video codec, useful mainly for development and debugging.

Null encoder/decoder discard all input and never return any output.

AV_CODEC_ID_ANULL

Dummy null audio codec, useful mainly for development and debugging.

Null encoder/decoder discard all input and never return any output.

Definition at line 49 of file codec_id.h .

Function Documentation

◆ avcodec_version()

Allocate an AVCodecContext and set its fields to default values.

The resulting struct should be freed with avcodec_free_context() .

Parameters

codecif non-NULL, allocate private data and initialize defaults for the given codec. It is illegal to then call avcodec_open2() with a different codec. If NULL, then the codec-specific defaults won't be initialized, which may result in suboptimal default settings (this is important mainly for encoders, e.g. libx264).

Returns

An AVCodecContext filled with default values or NULL on failure.

Examples

decode_audio.c , decode_filter_audio.c , decode_filter_video.c , decode_video.c , demux_decode.c , encode_audio.c , encode_video.c , extract_mvs.c , hw_decode.c , mux.c , qsv_decode.c , qsv_transcode.c , transcode.c , transcode_aac.c , vaapi_encode.c , and vaapi_transcode.c .

Definition at line 153 of file options.c .

Referenced by add_stream() , avcodec_dct_init() , avformat_new_stream() , config_input() , config_props() , cri_decode_init() , dash_init() , ds_open() , dump_stream_format() , estimate_best_b_count() , ff_frame_thread_encoder_init() , ff_load_image() , ftr_init() , imm5_init() , init_decoder() , init_encoder() , ist_add() , LLVMFuzzerTestOneInput() , main() , old_flac_header() , open_codec_context() , open_input_file() , open_output_file() , open_stream() , ost_add() , seek_test() , stream_component_open() , streamcopy_init() , tdsc_init() , tiff_init() , video_decode() , and video_decode_example() .

Free the codec context and everything associated with it and write NULL to the provided pointer.

Examples

decode_audio.c , decode_filter_audio.c , decode_filter_video.c , decode_video.c , demux_decode.c , encode_audio.c , encode_video.c , extract_mvs.c , hw_decode.c , mux.c , qsv_decode.c , qsv_transcode.c , transcode.c , transcode_aac.c , vaapi_encode.c , and vaapi_transcode.c .

Definition at line 168 of file options.c .

Referenced by avcodec_dct_init() , close_input_file() , close_stream() , cri_decode_close() , dash_free() , decoder_destroy() , ds_free() , dump_stream_format() , estimate_best_b_count() , ff_free_stream() , ff_load_image() , ftr_close() , imm5_close() , ist_free() , LLVMFuzzerTestOneInput() , main() , movie_uninit() , old_flac_header() , open_input_file() , open_output_file() , ost_free() , seek_test() , stream_component_open() , streamcopy_init() , tdsc_close() , tiff_end() , uninit() , video_decode() , and video_decode_example() .

Get the AVClass for AVCodecContext .

It can be used in combination with AV_OPT_SEARCH_FAKE_OBJ for examining options.

See also

av_opt_find() .

Definition at line 187 of file options.c .

Referenced by filter_codec_opts() , ifile_open() , opt_default() , show_codec_opts() , show_help_default() , and validate_enc_avopt() .

Get the AVClass for AVSubtitleRect .

It can be used in combination with AV_OPT_SEARCH_FAKE_OBJ for examining options.

See also

av_opt_find() .

Definition at line 212 of file options.c .

Fill the parameters struct based on the values from the supplied codec context.

Any allocated fields in par are freed and replaced with duplicates of the corresponding fields in codec.

Returns

>= 0 on success, a negative AVERROR code on failure

Examples

mux.c , qsv_transcode.c , transcode.c , transcode_aac.c , and vaapi_transcode.c .

Definition at line 137 of file codec_par.c .

Referenced by aom_init() , avformat_find_stream_info() , dec_enc() , decode_bsfs_init() , enc_open() , ist_add() , mediacodec_init_bsf() , open_audio() , open_output_file() , open_video() , qsv_enc_init() , and streamcopy_init() .

Fill the codec context based on the values from the supplied codec parameters.

Any allocated fields in codec that have a corresponding field in par are freed and replaced with duplicates of the corresponding field in par. Fields in codec that do not have a counterpart in par are not touched.

Returns

>= 0 on success, a negative AVERROR code on failure.

Examples

decode_filter_audio.c , decode_filter_video.c , demux_decode.c , extract_mvs.c , hw_decode.c , qsv_transcode.c , transcode.c , transcode_aac.c , and vaapi_transcode.c .

Referenced by avformat_find_stream_info() , dash_init() , ds_open() , dump_stream_format() , ff_load_image() , ist_add() , main() , old_flac_header() , open_codec_context() , open_input_file() , open_stream() , read_frame_internal() , seek_test() , stream_component_open() , streamcopy_init() , update_stream_avctx() , video_decode() , and video_decode_example() .

Initialize the AVCodecContext to use the given AVCodec .

Prior to using this function the context has to be allocated with avcodec_alloc_context3() .

The functions avcodec_find_decoder_by_name() , avcodec_find_encoder_by_name() , avcodec_find_decoder() and avcodec_find_encoder() provide an easy way for retrieving a codec.

Depending on the codec, you might need to set options in the codec context also for decoding (e.g. width, height, or the pixel or audio sample format in the case the information is not available in the bitstream, as when decoding raw audio or video).

Options in the codec context can be set either by setting them in the options AVDictionary , or by setting the values in the context itself, directly or by using the av_opt_set() API before calling this function.

Example:

av_dict_set (& opts , "b" , "2.5M" , 0);

codec = avcodec_find_decoder ( AV_CODEC_ID_H264 );

if (!codec)

exit(1);

context = avcodec_alloc_context3 (codec);

if ( avcodec_open2 ( context , codec, opts ) < 0)

exit(1);

In the case AVCodecParameters are available (e.g. when demuxing a stream using libavformat, and accessing the AVStream contained in the demuxer), the codec parameters can be copied to the codec context using avcodec_parameters_to_context() , as in the following example:

AVStream *stream = ...;

context = avcodec_alloc_context3 (codec);

if ( avcodec_parameters_to_context ( context , stream-> codecpar ) < 0)

exit(1);

if ( avcodec_open2 ( context , codec, NULL ) < 0)

exit(1);

Note

Always call this function before using decoding routines (such as avcodec_receive_frame() ).

Parameters

avctxThe context to initialize. codecThe codec to open this context for. If a non-NULL codec has been previously passed to avcodec_alloc_context3() or for this context, then this parameter MUST be either NULL or equal to the previously passed codec. optionsA dictionary filled with AVCodecContext and codec-private options, which are set on top of the options already set in avctx, can be NULL. On return this object will be filled with options that were not found in the avctx codec context.

Returns

zero on success, a negative value on error

See also

avcodec_alloc_context3() , avcodec_find_decoder() , avcodec_find_encoder() , av_dict_set() , av_opt_set() , av_opt_find() , avcodec_parameters_to_context()

Definition at line 128 of file avcodec.c .

Referenced by avformat_find_stream_info() , config_input() , config_props() , cri_decode_init() , dec_enc() , dec_open() , ds_run() , enc_open() , estimate_best_b_count() , ff_frame_thread_encoder_init() , ff_load_image() , ftr_init() , imm5_init() , init_decoder() , init_encoder() , LLVMFuzzerTestOneInput() , main() , open_audio() , open_codec_context() , open_input_file() , open_output_file() , open_stream() , open_video() , process_frame() , seek_test() , stream_component_open() , tdsc_init() , tiff_init() , try_decode_frame() , video_decode() , video_decode_example() , and wrap() .

Close a given AVCodecContext and free all the data associated with it (but not the AVCodecContext itself).

Calling this function on an AVCodecContext that hasn't been opened will free the codec-specific data allocated in avcodec_alloc_context3() with a non-NULL codec. Subsequent calls will do nothing.

Note

Do not use this function. Use avcodec_free_context() to destroy a codec context (either open or closed). Opening and closing a codec context multiple times is not supported anymore – use multiple codec contexts instead.

Definition at line 435 of file avcodec.c .

Referenced by avcodec_free_context() , avcodec_open2() , avformat_find_stream_info() , ff_frame_thread_encoder_init() , read_frame_internal() , and worker() .

Returns

the next registered codec or NULL when the iteration is finished

Definition at line 926 of file allcodecs.c .

Referenced by choose_decoder() , codec_child_class_iterate() , find_codec() , find_codec_by_name() , find_probe_decoder() , main() , next_codec_for_id() , and show_codec_opts() .

Returns

A decoder if one was found, NULL otherwise.

Definition at line 975 of file allcodecs.c .

Referenced by avcodec_get_name() , avcodec_open2() , AVCodecInitialize() , choose_decoder() , cri_decode_init() , ds_open() , dshow_cycle_formats() , ff_find_decoder() , ff_load_image() , filter_codec_opts() , find_codec() , ftr_init() , imm5_init() , main() , open_codec_context() , open_input_file() , open_stream() , seek_test() , show_codecs() , stream_component_open() , tdsc_init() , tiff_init() , video_decode() , and video_decode_example() .

Returns

A decoder if one was found, NULL otherwise.

Definition at line 1003 of file allcodecs.c .

Referenced by config_input() , find_codec() , find_probe_decoder() , main() , open_input_file() , show_help_codec() , and stream_component_open() .

Returns

An encoder if one was found, NULL otherwise.

Definition at line 970 of file allcodecs.c .

Referenced by add_stream() , avcodec_get_name() , avcodec_open2() , choose_encoder() , config_props() , filter_codec_opts() , find_codec() , main() , map_auto_subtitle() , open_output_file() , and show_codecs() .

Returns

An encoder if one was found, NULL otherwise.

Definition at line 998 of file allcodecs.c .

Referenced by config_input() , find_codec() , main() , and show_help_codec() .

Returns

a non-zero number if codec is an encoder, zero otherwise

Definition at line 78 of file utils.c .

Referenced by avcodec_close() , avcodec_find_encoder() , avcodec_find_encoder_by_name() , avcodec_flush_buffers() , avcodec_open2() , avcodec_receive_packet() , avcodec_send_frame() , ff_slice_thread_init() , init_band_stepsize() , init_prec() , main() , next_codec_for_id() , and print_codec() .

Returns

a non-zero number if codec is a decoder, zero otherwise

Definition at line 86 of file utils.c .

Referenced by avcodec_close() , avcodec_find_decoder() , avcodec_find_decoder_by_name() , avcodec_open2() , avcodec_receive_frame() , avcodec_send_packet() , choose_decoder() , ff_decode_receive_frame() , ff_get_buffer() , find_probe_decoder() , get_category() , main() , next_codec_for_id() , v4l2_configure_contexts() , and v4l2_get_framesize_compressed() .

Retrieve supported hardware configurations for a codec.

Values of index from zero to some maximum return the indexed configuration descriptor; all other values return NULL. If the codec does not support any hardware configurations then it will always return NULL.

Examples

hw_decode.c .

Definition at line 859 of file utils.c .

Referenced by avcodec_default_get_format() , choose_decoder() , get_format() , hw_device_match_by_codec() , hw_device_setup_for_decode() , hw_device_setup_for_encode() , main() , and print_codec() .

Returns

descriptor for given codec ID or NULL if no descriptor exists.

Definition at line 3722 of file codec_desc.c .

Referenced by asf_write_header1() , av_bsf_init() , avcodec_get_name() , avcodec_get_type() , avcodec_open2() , avcodec_profile_name() , ff_is_intra_only() , get_codec_name() , get_mimetype() , init_muxer() , ist_add() , list_formats() , main() , map_auto_subtitle() , new_stream_subtitle() , print_stream_maps() , read_frame_internal() , show_help_muxer() , show_stream() , unsupported_codec() , update_stream_avctx() , and vaapi_decode_make_config() .

Returns

next descriptor or NULL after the last descriptor

Definition at line 3728 of file codec_desc.c .

Referenced by avcodec_descriptor_get_by_name() , get_codecs_sorted() , and main() .

Returns

codec descriptor with the given name or NULL if no such descriptor exists.

Definition at line 3737 of file codec_desc.c .

Referenced by concat_parse_script() , find_codec() , main() , show_help_codec() , and v4l2_read_header() .

Get the name of a codec.

Returns

a static string identifying the codec; never NULL

Examples

mux.c .

Definition at line 417 of file utils.c .

Referenced by add_stream() , amv_init() , av_bsf_init() , avcodec_string() , avformat_find_stream_info() , choose_encoder() , dec_open() , demux_stream_alloc() , device_try_init() , ff_framehash_write_header() , ff_put_wav_header() , ff_vk_decode_init() , flv_init() , get_audio_flags() , get_dvb_stream_type() , get_m2ts_stream_type() , ico_check_attributes() , log_slave() , lrc_write_header() , main() , mkv_assemble_codecprivate() , mkv_init() , mov_init() , mov_write_squashed_packets() , mpeg_mux_init() , mxf_parse_structural_metadata() , read_frame_internal() , rtp_write_header() , scc_write_header() , srt_write_header() , stream_component_open() , vulkan_decode_get_profile() , and wsaud_write_init() .

Returns

Number of bits per sample or zero if unknown for the given codec.

Definition at line 558 of file utils.c .

Referenced by adpcm_encode_init() , aiff_write_header() , avformat_find_stream_info() , caf_write_header() , epaf_read_header() , ff_alsa_open() , ff_pcm_read_seek() , ff_put_wav_header() , ff_voc_get_packet() , g722_read_header() , get_aiff_header() , get_bit_rate() , gxf_packet() , iff_read_header() , init() , init_muxer() , ircam_read_header() , mkv_write_track() , mov_get_codec_tag() , mov_init() , mov_parse_stsd_audio() , mov_write_audio_tag() , mxf_handle_missing_index_segment() , mxf_init() , mxf_parse_structural_metadata() , mxf_set_audio_pts() , mxf_write_generic_sound_common() , oma_read_header() , pcm_decode_frame() , pcm_decode_init() , pcm_encode_frame() , pcm_encode_init() , pcm_read_header() , read_header() , rso_read_header() , show_stream() , wsaud_write_header() , and wve_read_header() .

Return codec bits per sample.

Only return non-zero if the bits per sample is exactly correct, not an approximation.

Parameters

[in]codec_idthe codec

Returns

Number of bits per sample or zero if unknown for the given codec.

Definition at line 465 of file utils.c .

Referenced by av_get_bits_per_sample() , get_audio_frame_duration() , imf_read_packet() , mov_write_pcmc_tag() , and ost_add() .

Returns

A name for the profile if found, NULL otherwise.

Note

unlike av_get_profile_name() , which searches a list of profiles supported by a specific decoder or encoder implementation, this function searches the list of profiles from the AVCodecDescriptor

Definition at line 450 of file utils.c .

Referenced by avcodec_string() , show_stream() , and vulkan_decode_get_profile() .

Allocate a new AVCodecParameters and set its fields to default values (unknown/invalid/0).

The returned struct must be freed with avcodec_parameters_free() .

Definition at line 56 of file codec_par.c .

Referenced by av_bsf_alloc() , avformat_new_stream() , ff_mov_init_hinting() , flv_read_packet() , ist_add() , mov_create_chapter_track() , mov_create_timecode_track() , and ost_add() .

Free an AVCodecParameters instance and everything associated with it and write NULL to the supplied pointer.

Definition at line 66 of file codec_par.c .

Referenced by av_bsf_free() , ff_free_stream() , ff_mov_close_hinting() , ff_mov_init_hinting() , flv_read_packet() , ist_free() , mov_free() , and ost_free() .

Copy the contents of src to dst.

Any allocated fields in dst are freed and replaced with newly allocated duplicates of the corresponding fields in src.

Returns

>= 0 on success, a negative AVERROR code on failure.

Definition at line 106 of file codec_par.c .

Referenced by asfrtp_parse_sdp_line() , av1_read_header() , av_bsf_init() , bsf_init() , bsf_list_init() , copy_stream_props() , dash_init() , detect_stream_specific() , evc_read_header() , extract_extradata_init() , ff_rtp_chain_mux_open() , ff_stream_add_bitstream_filter() , hds_write_header() , hls_mux_init() , ism_write_header() , main() , mov_init_ttml_writer() , mpegts_init() , open_demux_for_component() , open_output_file() , open_slave() , read_gab2_sub() , rtp_mpegts_write_header() , sap_fetch_packet() , sap_read_header() , set_stream_info_from_input_stream() , stream_params_copy() , and write_muxed_file() .

This function is the same as av_get_audio_frame_duration() , except it works with AVCodecParameters instead of an AVCodecContext .

Definition at line 812 of file utils.c .

Referenced by adp_read_header() , binka_read_packet() , build_frame_code() , compute_frame_duration() , compute_muxer_pkt_fields() , enable_pcr_generation_for_stream() , ff_parse_specific_params() , ff_put_wav_header() , ff_voc_get_packet() , get_aiff_header() , guess_pkt_duration() , mkv_write_track() , msf_read_header() , rm_write_header() , rsd_read_header() , rtp_send_ilbc() , rv10_write_header() , svs_read_header() , swf_write_audio() , vpk_read_seek() , and write_packet() .

avcodec_alloc_context3

AVCodecContext * avcodec_alloc_context3(const AVCodec *codec)

Allocate an AVCodecContext and set its fields to default values.

Definition: options.c:153

AV_CODEC_ID_H264

@ AV_CODEC_ID_H264

Definition: codec_id.h:79

context

it s the only field you need to keep assuming you have a context There is some magic you don t need to care about around this just let it vf default minimum maximum flags name is the option keep it simple and lowercase description are in without and describe what they for example set the foo of the bar offset is the offset of the field in your context

Definition: writing_filters.txt:91

opts

AVDictionary * opts

Definition: movenc.c:50

AVStream::codecpar

AVCodecParameters * codecpar

Codec parameters associated with this stream.

Definition: avformat.h:864

avcodec_parameters_to_context

int avcodec_parameters_to_context(AVCodecContext *codec, const struct AVCodecParameters *par)

Fill the codec context based on the values from the supplied codec parameters.

NULL

#define NULL

Definition: coverity.c:32

avcodec_open2

int attribute_align_arg avcodec_open2(AVCodecContext *avctx, const AVCodec *codec, AVDictionary **options)

Initialize the AVCodecContext to use the given AVCodec.

Definition: avcodec.c:128

avcodec_find_decoder

const AVCodec * avcodec_find_decoder(enum AVCodecID id)

Find a registered decoder with a matching codec ID.

Definition: allcodecs.c:975

AVStream

Stream structure.

Definition: avformat.h:841

av_dict_set

int av_dict_set(AVDictionary **pm, const char *key, const char *value, int flags)

Set the given entry in *pm, overwriting an existing entry.

Definition: dict.c:88