[vorbis] Multiple tracks per file, or continuous audio support

[Mark Hetherington]

Playing with XMMS it sounds fine. But I think XMMS does a MUCH better job 
with mp3s that continue into each other. (You barely notice the jump but it's 
there). Of course with ogg, it's not there.

On Sun, 4 Nov 2001 17:40, you wrote:
> --- Michael Smith <msmith at labyrinth.net.au> wrote:
> > Vorbis has the same problem, BUT has a technique to
> > deal with it correctly.
> > In the bitstream, there's sufficient information
> > that the decoder knows
> > (this has worked since beta1, and even earlier)
> > which bits to discard from
> > the start and end - the output is, as a result,
> > exactly the same length (in
> > samples) as the original input.
>
> Is this the same thing though?  Just because it
> truncates the file to a certain length, can you be
> sure the waveform will match properly with the
> beginning of the next track?  Wouldn't it be better if
> there was a special way to tell the Ogg encoder what
> the first couple of milliseconds of the next track
> were, so the frames could be encoded more towards
> meeting the signal later?  Maybe that's overkill.  I'm
> not sure what influence the zero-padding has backwards
> on the signal.
>
> > Vorbis actually gives you BOTH of these - as I
> > described above, the
> > individual tracks work fine. Also, vorbis lets you
> > have multiple streams in
> > a single file, following each other - so you could
> > have one file with a
> > seperate stream for each track, which gives you
> > everything you wanted
> > (although player UI typically makes this hard to
> > take full advantage of -
> > write your own player if that's a problem :-)
>
> Yeah, actually I wouldn't be above writing some
> management tools that would split a multiple-track
> "archive" (properly handling continuity and track
> identity) into many little tracks.  I would seriously
> recommend "encouraging" players to figure this out on
> their own, though.  I can't believe this hasn't been a
> bigger issue than it seems (I really haven't heard
> much about this problem).  Even MiniDisc had this
> right from day one.
>
> I guess I'm skeptical of the first solution.  I *did*
> encode two tracks that play continuously, and played
> them back in Ogg-enabled Winamp.  There's a small pop.
>  This could be the player, though, cheating with its
> own zero frames.
>
> Anyone know of a way to check this out?  Any players
> that are especially Ogg-smart, in that they drop
> silence/breaks/etc.?
>
> Thanks again...
>
> Mike
>
>
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