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• 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.

• libx264 bitrate to high for streaming

  26 février 2015, par KevinA

  I’m using libx264 to encode video captured at 1080p 24fps from a video camera. The output of the encoder goes to Live555 for streaming. I cannot get the bitrate below 30 mb/s.

  My Current Settings for x264 are :

  if (x264_param_default_preset(&m_pParam, "ultrafast", "zerolatency") != 0){
  
      return false;
  
  }
  
  int fps = 24;
  
  m_pParam.i_threads = 1;
  
  m_pParam.i_fps_num = fps;
  
  m_pParam.i_fps_den = 1;
  
  m_pParam.i_width = m_iWidthOut;
  
  m_pParam.i_height = m_iHeightOut;
  
  
  
  // One keyframe per X frames:
  
  m_pParam.i_keyint_max = 60;
  
  
  
  //Rate control:
  
  m_pParam.rc.i_rc_method = X264_RC_CRF;
  
  m_pParam.rc.f_rf_constant = fps - 5;
  
  m_pParam.rc.f_rf_constant_max = fps + 5;
  
  //m_pParam.i_sps_id = 7;
  
  //For streaming:
  
  m_pParam.b_repeat_headers = 1;
  
  m_pParam.b_annexb = 1;
  
  m_pParam.b_intra_refresh = 1;
  
  
  
  if (x264_param_apply_profile(&m_pParam, "main") != 0) {
  
      return false;
  
  }
  
  
  
  return true;

  Changing the preset seems to only slow the encoding rate and consequently the frame rate.

  How can I get the bitrate below 30mb/s so I can stream to something like a phone ?

• libx264 bitrate to high for streaming

  26 février 2015, par KevinA

  I’m using libx264 to encode video captured at 1080p 24fps from a video camera. The output of the encoder goes to Live555 for streaming. I cannot get the bitrate below 30 mb/s.

  My Current Settings for x264 are :

  if (x264_param_default_preset(&m_pParam, "ultrafast", "zerolatency") != 0){
  
      return false;
  
  }
  
  int fps = 24;
  
  m_pParam.i_threads = 1;
  
  m_pParam.i_fps_num = fps;
  
  m_pParam.i_fps_den = 1;
  
  m_pParam.i_width = m_iWidthOut;
  
  m_pParam.i_height = m_iHeightOut;
  
  
  
  // One keyframe per X frames:
  
  m_pParam.i_keyint_max = 60;
  
  
  
  //Rate control:
  
  m_pParam.rc.i_rc_method = X264_RC_CRF;
  
  m_pParam.rc.f_rf_constant = fps - 5;
  
  m_pParam.rc.f_rf_constant_max = fps + 5;
  
  //m_pParam.i_sps_id = 7;
  
  //For streaming:
  
  m_pParam.b_repeat_headers = 1;
  
  m_pParam.b_annexb = 1;
  
  m_pParam.b_intra_refresh = 1;
  
  
  
  if (x264_param_apply_profile(&m_pParam, "main") != 0) {
  
      return false;
  
  }
  
  
  
  return true;

  Changing the preset seems to only slow the encoding rate and consequently the frame rate.

  How can I get the bitrate below 30mb/s so I can stream to something like a phone ?