audio/video chunk sequence in avi file

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?

Thank you so much!

Gerry

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