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• Extract undecoded audio payload from song file ?

  19 février, par Gabriel

  What tools are available to extract the raw undecoded audio payload from a song file ?

  



  I am looking for a solution that will work on wma, m4a, mp3, and ogg files.

  



  One of the purposes is to be able to calculate the md5sum of the audio payload.

  



  I tried ffmpeg -i <song file="file"> -f md5 -</song> but this actually does a decoding pass which is not desired. Also this seems to produce different results depending on the versions of the decoders in use.

  



  I tried ffmpeg -i <song file="file"> -acodec copy - > <raw payload="payload" file="file"></raw></song> but ffmpeg complains that it does not know the desired output format even though copy is explicitly specified.

  



  I've tried various incarnations of -map_metadata -1 but the documentation is obtuse at best.

  



  In the end the ideal is to have an stdout of the raw UNdecoded audio portion of a song file.

  



  Any ideas ?

  


• Extract undecoded audio payload from song file ?

  6 juin 2012, par DataSurfer

  What tools are available to extract the raw undecoded audio payload from a song file ?

  I am looking for a solution that will work on wma, m4a, mp3, and ogg files.

  One of the purposes is to be able to calculate the md5sum of the audio payload.

  I tried ffmpeg -i <song file="file"> -f md5 -</song> but this actually does a decoding pass which is not desired. Also this seems to produce different results depending on the versions of the decoders in use.

  I tried ffmpeg -i <song file="file"> -acodec copy - > <raw payload="payload" file="file"></raw></song> but ffmpeg complains that it does not know the desired output format even though copy is explicitly specified.

  I've tried various incarnations of -map_metadata -1 but the documentation is obtuse at best.

  In the end the ideal is to have an stdout of the raw UNdecoded audio portion of a song file.

  Any ideas ?

• Word-by-word display of subtitles in FFMPEG ?

  10 mars 2020, par ThaDon

  I am trying to burn subtitles into a video such that they appear in a word-by-word fashion instead of all at once.

  What I mean by this is, a word will appear, then another word will appear next to it, and so on. Eventually the line will clear, then repeat.

  Example :

  

  I thought I could create an Advanced Substation Alpha file where subtitles share the same end-time but differing start times, however FFMPEG doesn’t seem to cope very well when rendering the file :

  [Script Info]
  
  ; Script generated by FFmpeg/Lavc57.107.100
  
  ScriptType: v4.00+
  
  PlayResX: 384
  
  PlayResY: 288
  
  
  
  [V4+ Styles]
  
  Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
  
  Style: Default,Arial,16,&Hffffff,&Hffffff,&H0,&H0,0,0,0,0,100,100,0,0,1,1,0,2,10,10,10,0
  
  
  
  [Events]
  
  Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
  
  Dialogue: 0,0:00:00.00,0:00:03.46,Default,,0,0,0,,I'm
  
  Dialogue: 0,0:00:01.00,0:00:03.46,Default,,0,0,0,,a
  
  Dialogue: 0,0:00:01.50,0:00:03.46,Default,,0,0,0,,subtitle

  The idea being that I'm would appear, then 1 second later a would show up next to it followed by subtitle a half second later