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• mkv extract full DTS HD Master and Dolby True HD in flac or wav

  11 novembre 2016, par esposito

  I have some mkv files with audio in DTS Master 5.1 / 7.1 and Dolby True HD.

  I like to extract the full lossless audio 24/96 (core + residual part) in one flac or wav.

  If I do this :

  ffmpeg.exe -i input.mkv -map 0:2 output.dts

  or this :

   ffmpeg.exe -i input.mkv -map 0:2 output.flac

  it will extact only a lossy part. For dolby true HD there is the some problem I suppose.

  There is a way to extact full "lossless" audio in flac or wav directly ?

  I don’t like extact 2 files (core + residual) but "merge" All in one flac/wav file.

  thank you !

• how to add reference movie into ffmpeg psnr filter in codes (computing psnr)

  15 octobre 2016, par user1317278

  I just want to find out how to use the psnr filter in ffmpeg in codes.

  I have followed the codes stated in https://ffmpeg.org/ffmpeg-filters.html#psnr :

  sprintf(args, "movie=ref_movie.avi [main];[main][ref] psnr=\"stats_file=stats.log\" [out]");
  
  err = avfilter_graph_create_filter(&psnrCtx,  psnrFilter, "psnr", args, NULL, m_filterGraph);
  
  if ( err < 0 ) {
  
      avfilter_graph_free(&m_filterGraph);
  
      m_filterGraph = NULL;
  
      return false; }

  But the error message return to me :

  Option 'movie' not found

  I also try this :

  sprintf(args, "stats_file=stats.log");
  
  err = avfilter_graph_create_filter(&psnrCtx,  psnrFilter, "psnr", args, NULL, m_filterGraph);
  
  if ( err < 0 ) {
  
     avfilter_graph_free(&m_filterGraph);
  
     m_filterGraph = NULL;
  
     return false; }
  
  err = avfilter_link(last_ctx, 0, psnrCtx, 0);
  
  if ( err < 0 ) {
  
     avfilter_graph_free(&m_filterGraph);
  
     m_filterGraph = NULL;
  
     return false;}
  
  
  
  ...  
  
  err = avfilter_graph_config(m_filterGraph, NULL);
  
  if ( err < 0 ) {
  
     avfilter_graph_free(&m_filterGraph);
  
     m_filterGraph = NULL;
  
     return false;
  
  }

  but the error message return to me :

  Input pad "reference" with type video of the filter instance "psnr" of psnr not connected to any source

  I search psnr filter in codes but there is not much information about it. Can anyone help on this ?

• recompiling audio from a movie source

  4 novembre 2016, par jkushner

  Is it possible to recompile movie files to re-stream the audio so they all have the same volume level ? We’ve got users submitting videos and to me it seems some are higher in volume whereas others are not, and they all have the same volume level on the controls, and i’d like to standardize this so all movie files have the same volume levels.

  I was thinking of ffmpeg although I only have novice knowledge of this technology and haven’t done my research in it yet.

  Anyway if there’s anything available I’d love to know.

  Thanks !