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• Extract number of frames without using shell-True

  26 mars 2022, par petrush

  I have the following code that extract number of frames from video :

  


  filename = "test.mp4"
video_path = os.path.join(os.getcwd(), filename)
with open(video_path, "rb") as file:
    cmd = f'ffmpeg -i {video_path} -r 10 -q:v 3 -s 1x1 -f image2 -update 1 - >/dev/null'
    proc = sp.Popen(cmd, stdout=sp.PIPE, stderr=sp.PIPE, shell=True)
    (stdout, stderr) = proc.communicate()

    # i.e: 'frame= 2062 fps=966 q=3.0 Lsize=N/A time=00:10:34.46 bitrate=N/A dup=1049 drop=3563 speed= 297x'
    decoded = stderr.decode('utf-8')
    frame_count_line = decoded.splitlines()[-2]
    m = FRAME_COUNT_REGEX.search(frame_count_line)
    if m:
        print(int(m.groups()[0]))


  


  but because of security reasons I want to remove shell=True parameter.
Unfortunately after that the code above throws :

  


  FileNotFoundError: [Errno 2] No such file or directory


  


  Please help to fix it

  


• avcodec/mpegvideo_enc : Remove always-true check

  23 mars 2022, par Andreas Rheinhardt

  avcodec/mpegvideo_enc : Remove always-true check
  It is a remnant of the old way for user-supplied buffers ;
  
  it is always-true since 93016f5d1d280f9cb7856883af287fa66affc04c.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/mpegvideo_enc.c

• Is there a way to use ffmpeg for RGB to true YUV (not YCbCr) conversion ?

  16 avril 2022, par haidahaida

  As far as I can see in the documentation, all conversions involving YUV actually use YCbCr. There are slight differences though, and I would like to convert to the actual YUV format. Is there any way at all using ffmpeg ? As an afterthought, is there any other way that is as fast as ffmpeg ?

  



  
^{Image source}