[VideoWriter]保存H264/MPEG4格式MP4视频 ¶

OpenCV: FFMPEG: tag 0x34363268/'h264' is not supported with codec

Can you support "H264" codec? #299

import cv2
fourcc_type = 'avc1'
# fourcc_type = 'mp4v'
output_path = 'output.mp4'
def main():
    # open camera
    vc = cv2.VideoCapture('/home/zj/test.mp4')
    if not vc.isOpened():
        print('Error: can not opencv camera')
        exit(0)
    ret, frame = vc.read()
    w = int(vc.get(cv2.CAP_PROP_FRAME_WIDTH))
    h = int(vc.get(cv2.CAP_PROP_FRAME_HEIGHT))
    fps = vc.get(cv2.CAP_PROP_FPS)
    fourcc = cv2.VideoWriter_fourcc(*fourcc_type)
    vw = cv2.VideoWriter(output_path, fourcc, fps, (w, h), True)
    while ret:
        vw.write(frame)
        ret, frame = vc.read()
        # cv2.imshow('frame', frame)
        # if cv2.waitKey(int(1 / fps * 1000)) & 0xFF == ord('q'):
        #     break
    # cv2.destroyAllWindows()
    vw.release()
if __name__ == '__main__':
    main()
使用编解码器MPEG-4 Video (Simple Profile)，需要设置fourcc_type = 'mp4v'
使用编解码器H.264 (High Profile)，需要设置fourcc_type = 'avc1'    
opencv使用ffmpeg进行视频流的编解码，对于h264格式视频，需要额外安装openh264
  FFMPEG build includes support for H264 encoder based on the OpenH264 library.
  OpenH264 Video Codec provided by Cisco Systems, Inc.
  See https://github.com/cisco/openh264/releases for details and OpenH264 license.
  OpenH264 library should be installed separatelly. Downloaded binary file can be placed into global system path
  (System32 or SysWOW64) or near application binaries (check documentation of "LoadLibrary" Win32 function from MSDN).
  Or you can specify location of binary file via OPENH264_LIBRARY environment variable.
使用conda安装libopenh264库即可。参考conda-forge / packages / openh264
conda install -c conda-forge openh264
如果无法安装成功，那么就下载该文件进行手动安装
pip install --use-local openh264-2.1.1-h780b84a_0.tar.bz2