[osflash] FLV Audiodata tag and ffmpeg

[Shawn Svacha]

Hi everyone.  I am studying the FLV file format and have a couple of questions that I hope you all might be able to shed some light on.
   
  The audio data that I have a question on is as follows: 00100110
   
  If I understand this correctly, this translates to:
   
  MP3     11kHz  16bit     mono
  0010        01       1          0
   
  Am I correct?
   
  The reason I ask is that when I use ffmpeg (such as ffmpeg -i test.flv test.mp3)
   
  I get an error stating that 11kHz is not compatible with mp2.  If I change the audio bit to read 22050, though, it converts. (i.e., ffmpeg -i test.flv -ab 22050 test.mp3)
   
  What I don't understand is that if the audio is already a mp3 in the flv file, why does ffmpeg not like its current format?  Seems to me is should convert just fine since it is already an mp3 -- am I misunderstanding something?
   
  Also on a different note, in the official specification from Adobe on the swf and flv format, it reads that the tag type for a flv file can be 8 for audio, 9 for video, and 18 for script data (see page 269), however I understand that metadata has a tag value of 12 -- is script data and meta data two different things?
   
  Thanks in advance!
   
  Shawn

       
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