[vorbis-dev] embedding a lot of vorbis comments

[Scott Wheeler]

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On Tuesday 11 May 2004 10:20, Christoph Rupp wrote:
> Dear list,
> 
> i want to embed some meta data in an ogg stream, which contains 
> additional commands for the ogg player like setting the volume, panning 
> etc. I.e. for fading out a song i would send several commands like "set 
> volume to 99%", "set volume to 98%", "set volume to 97%" etc etc.
> 
> I thought using vorbis comments could be a good idea. But they would be 
> spread over the whole file. Is this possible with vorbis comments? it 
> seems that i can only send them when calling vorbis_analysis_headerout()...

The first thing that comes to mind is what the spec has to say about comments:

  The Vorbis text comment header is the second (of three) header packets that 
  begin a Vorbis bitstream. It is meant for short, text comments, not 
  arbitrary metadata; arbitrary metadata belongs in a separate logical 
  bitstream (usually an XML stream type) that provides greater structure and 
  machine parseability. 

  The comment field is meant to be used much like someone jotting a quick note 
  on the bottom of a CDR. It should be a little information to remember the 
  disc by and explain it to others; a short, to-the-point text note that need 
  not only be a couple words, but isn't going to be more than a short 
  paragraph. The essentials, in other words, whatever they turn out to be, 
  [...]

http://www.xiph.org/ogg/vorbis/doc/v-comment.html

It would seem that what you're trying to do is something of an abuse of 
comments; my understanding is that tthey should all map to something that's 
meaningful to a human reader.

- -Scott

- -- 
New Orleans food is as delicious as the less criminal forms of sin.
 --Mark Twain
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