Re: audio/video chunk sequence in avi file

Thank you very much!

On 5/8/08, Burkhard Plaum <[email protected]> wrote:
>
> Hi,
>
> Gerry Fan schrieb:
> > When I look at the mjpg avi file, audio and video are interleaved in
> > movi. What is the rule for the audio and video chunk sequence?  is it
> > like this:
> >  audio_chunk  for one period ( say x seconds )
> >  video_chunk1
> >  video_chunk2
> >  ....
> >  all video_chunks for the play time equavlent to the previous
> > audio_chunk ( x second )
> >
> >  audio_chunk2
> >  video_chunks
> > .... ( all video_chunks for play time equavelent to audio_chunk2)
> >
> >
> > in other words, video chunks will not be encoded to place in avi
> > file where it is ahead of its corresponding audio chunk. Is this correct?
>
> There is no such rule. Audio chunks vary from one video frame duration up
> to
> 1 second or so. I even saw an AVI file (DivX), which had all video chunks
> followed by all audio chunks. When I encode AVIs or Quicktime, I make
> the audio chunks about 0.5 seconds long.
>
> Shorter audio chunks make seeking more efficient, longer audio chunks
> decrease
> the overhead. Software decoders usually never have problems, hardware
> decoders
> (like DivX players) might screw up, if the required buffer size becomes to
> large.
>
> Burkhard
>
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