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• Extracting MP3 Data from Generic Movie Files using FFMPEG

  21 février 2017, par MoonKnight

  I am using FFMPEG via MediaToolkit to extract MP3 data (to .mp3 file) from different movie files (merely .mp4 and .mov for now).

  MediaToolkit is just a C# wrapper for FFMPEG which calls FFMPEG via Process.Start, so to do this I am using the method

  public static string GenerateMp3FromVideoFile(string filePath)
  
  {
  
      string mp3Path = String.Empty;
  
      using (var engine = new Engine())
  
      {
  
          mp3Path = Path.GetFileNameWithoutExtension(filePath);
  
          mp3Path = Path.Combine(Utils.GetBuildRoamingAppDataDirectory(), mp3Path);
  
          mp3Path = Path.ChangeExtension(mp3Path, ".mp3");
  
          string paramString = String.Format(
  
              //"-i \"{0}\" -q:a 0 -map a \"{1}\"",
  
              //"-i \"{0}\" -ar 320K \"{1}\"",
  
              //"-i \"{0}\" -acodec libmp3lame -ar 44100 -b:a 192k -id3v2_version 3 -write_id3v1 1 \"{1}\"",
  
              //"-i \"{0}\" -vn -ar 44100 -ac 2 -ab 192k -f mp3 \"{1}\"",
  
              "-i \"{0}\" -acodec libmp3lame \"{1}\"",
  
              filePath,
  
              mp3Path);
  
          engine.CustomCommand(paramString);
  
      }
  
      return mp3Path;
  
  }

  All of the options I have tried above for the command line arguments passed to FFMPEG have worked for .mp4 video files and create the desired .mp3 output. However, for the .mov file I have I am getting the following System.Exception

  69 : video:0kB audio:1059kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead : 0.030074%Conversion failed !

  I have tried a number of different methods to perform this extraction with varing control via the arguments passed to FFMPEG, but with no luck for the .mov file.

  Looking at https://linuxconfig.org/ffmpeg-audio-format-conversions it seems as though there is not conversion to MP3 from .mov files, so I have looked at first converting the .mov to .mp4 via

  ffmpeg -i mymovie.mov -vcodec copy -acodec copy out.mp4

  and then extracting the audio, but this is expensive for large files. Is there a way of extracting the MP3 data directly from the .mov file ?

  Thanks for your time.

  ---

  When the above command is run from FFMPEG.exe, the output is :

  [aac @ 00000000021b00a0] Inconsistent channel configuration.
  [aac @ 00000000021b00a0] get_buffer() failed
  Error while decoding stream #0:1 : Invalid argument
  [aac @ 00000000021b00a0] Reserved bit set.
  [aac @ 00000000021b00a0] Number of bands (6) exceeds limit (5).
  Error while decoding stream #0:1 : Invalid data found when processing input
  [aac @ 00000000021b00a0] Number of bands (16) exceeds limit (13).
  Error while decoding stream #0:1 : Invalid data found when processing input
  [aac @ 00000000021b00a0] channel element 3.7 is not allocated
  Error while decoding stream #0:1 : Invalid data found when processing input
  [aac @ 00000000021b00a0] channel element 3.8 is not allocated
  Error while decoding stream #0:1 : Invalid data found when processing input
  [aac @ 00000000021b00a0] Reserved bit set.
  [aac @ 00000000021b00a0] TNS filter order 28 is greater than maximum 12.
  Error while decoding stream #0:1 : Invalid data found when processing input
  [aac @ 00000000021b00a0] Number of bands (26) exceeds limit (18).
  Error while decoding stream #0:1 : Invalid data found when processing input
  [aac @ 00000000021b00a0] Sample rate index in program config element does not match the sample rate index configured by
  the container.
  [aac @ 00000000021b00a0] Too large remapped id is not implemented. Update your FFmpeg version to the newest one from Git
  . If the problem still occurs, it means that your file has a feature which has not been implemented.
  [aac @ 00000000021b00a0] If you want to help, upload a sample of this file to ftp://upload.ffmpeg.org/incoming/ and cont
  act the ffmpeg-devel mailing list. (ffmpeg-devel@ffmpeg.org)
  Error while decoding stream #0:1 : Not yet implemented in FFmpeg, patches welcome
  [aac @ 00000000021b00a0] Reserved bit set.
  [aac @ 00000000021b00a0] Prediction is not allowed in AAC-LC.
  Error while decoding stream #0:1 : Invalid data found when processing input
  [aac @ 00000000021b00a0] Reserved bit set.
  [aac @ 00000000021b00a0] ms_present = 3 is reserved.
  Error while decoding stream #0:1 : Invalid data found when processing input
  [aac @ 00000000021b00a0] Number of bands (3) exceeds limit (2).
  Error while decoding stream #0:1 : Invalid data found when processing input
  [aac @ 00000000021b00a0] SBR was found before the first channel element.
  [aac @ 00000000021b00a0] channel element 3.14 is not allocated
  Error while decoding stream #0:1 : Invalid data found when processing input
  [aac @ 00000000021b00a0] Sample rate index in program config element does not match the sample rate index configured by
  the container.

• doc : clarify option on looping infinitely in movie filter

  2 février 2017, par Werner Robitza

  doc : clarify option on looping infinitely in movie filter
  Clarify that setting loop=0 is required to make the stream loop infinitely, rather than saying that a value "less than 1" is needed.
  Signed-off-by : Lou Logan <lou@lrcd.com>
  

  • [DH] doc/filters.texi

• FFmpeg : real-time buffer[ ] [input] too full or near too full (101% of size : 3041280 [rtbufsize parameter]) frame dropped

  5 janvier 2017, par lostin2010

  I use the library of ffmpeg to decode stream from [TTQ HD Camera] and encode it to a rtmp stream.
  but I receive a lot of warnings like the picture below.
  i try to set qmin and qmax , it seems a little better. but still not totally resolve the problem.

  encoder_context->qmin = 10;
  
  encoder_context->qmax = 51;

  who knows this is why ?

  [dshow @ 04bfc640] real-time buffer [TTQ HD Camera] [video input] too full or near too full (101% of size: 3041280 [rtbufsize parameter])! frame dropped!