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• ffmpeg convert from H.264 (High 4:4:4 Profile) to H.264 (Main Profile)

  22 juin 2016, par user3002233

  How can I convert a video from H.264 (High 4:4:4 Profile) to H.264 (Main Profile) using ffmpeg ?

  I can’t do that with this command : ffmpeg -i 1/25359.mp4 -profile:v main out.mp4.

  That’d return an error :

  ...
  
  That'd return an error:
  
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '1/25359.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.40.101
  
    Duration: 00:00:06.08, start: 0.000000, bitrate: 1059 kb/s
  
      Stream #0:0(und): Video: h264 (High 4:4:4 Predictive) (avc1 / 0x31637661), yuv444p, 351x297, 1057 kb/s, 12.50 fps, 12.50 tbr, 12800 tbn, 25 tbc (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
  No pixel format specified, yuv444p for H.264 encoding chosen.
  
  Use -pix_fmt yuv420p for compatibility with outdated media players.
  
  x264 [error]: main profile doesn't support 4:4:4
  
  [libx264 @ 0x8fa9640] Error setting profile main.
  
  [libx264 @ 0x8fa9640] Possible profiles: baseline main high high10 high422 high444
  
  Output #0, mp4, to '1/24545.mp4':
  
    Metadata:
  
      major_brand     : isom
  
      minor_version   : 512
  
      compatible_brands: isomiso2avc1mp41
  
      encoder         : Lavf56.40.101
  
      Stream #0:0(und): Video: h264, none, q=2-31, 128 kb/s, 12.50 fps (default)
  
      Metadata:
  
        handler_name    : VideoHandler
  
        encoder         : Lavc56.60.100 libx264
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (h264 (native) -> h264 (libx264))
  
  Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height

• lavc/h264 : move history parsing variable to H264ParseContext

  19 juin 2016, par Clément Bœsch

  lavc/h264 : move history parsing variable to H264ParseContext
  This makes h264_find_frame_end() not depend on H264Context anymore.
  

  • [DH] libavcodec/h264.h
  • [DH] libavcodec/h264_parser.c

• The audio export failed, possily because the bitrate you specified was > two high or too low for the video codec

  13 avril 2016, par Michael

  I am occasionally receiving the following error when attempting to write a m4a (aac) audio file to a video using write_videofile with the moviepy library. I cannot isolate what exactly is causing this error because it happens rarely. I have tried specifying different audio bitrates, but it still raise an exception.

  video = video.set_audio(AudioFileClip("asdf.m4a"))
  
  video.write_videofile("video.mp4", fps=FPS, codec='libx264', audio_codec="aac", temp_audiofile='temp-audio.m4a', remove_temp=True, audio_bitrate="256k")

  [Errno 32] Broken pipe MoviePy error : FFMPEG encountered the
  following error while writing file temp-audio.m4a :

  temp-audio.m4a : Permission denied

  The audio export failed, possily because the bitrate you specified was
  two high or too low for the video codec. : IOError Traceback (most
  recent call last) :

  video.write_videofile("video.mp4",
  fps=FPS, codec=’libx264’, audio_codec="aac",
  temp_audiofile=’temp-audio.m4a’, remove_temp=True,
  audio_bitrate="256k")

  File "", line 2, in write_videofile File
  "/var/task/moviepy/decorators.py", line 54, in requires_duration
  return f(clip, *a, **k)

  File "", line 2, in write_videofile File
  "/var/task/moviepy/decorators.py", line 137, in
  use_clip_fps_by_default return f(clip, *new_a, **new_kw) File
  "", line 2, in write_videofile File
  "/var/task/moviepy/decorators.py", line 22, in convert_masks_to_RGB
  return f(clip, *a, **k)

  File "/var/task/moviepy/video/VideoClip.py", line 331, in
  write_videofile verbose=verbose) File "", line 2,
  in write_audiofile File "/var/task/moviepy/decorators.py", line 54,
  in requires_duration return f(clip, *a, **k) File
  "/var/task/moviepy/audio/AudioClip.py", line 204, in write_audiofile
  verbose=verbose, ffmpeg_params=ffmpeg_params) File
  "", line 2, in ffmpeg_audiowrite File
  "/var/task/moviepy/decorators.py", line 54, in requires_duration
  return f(clip, *a, **k) File
  "/var/task/moviepy/audio/io/ffmpeg_audiowriter.py", line 162, in
  ffmpeg_audiowrite writer.write_frames(chunk) File
  "/var/task/moviepy/audio/io/ffmpeg_audiowriter.py", line 122, in
  write_frames raise IOError(error)

  IOError : [Errno 32] Broken pipe MoviePy error : FFMPEG encountered the
  following error while writing file temp-audio.m4a : temp-audio.m4a :
  Permission denied The audio export failed, possily because the
  bitrate you specified was two high or too low for the video codec.