The Reason for effects like this are basically, that a DTV audio MPEG-2
stream may have "gaps" of varying length in the audio. If you simply decode
as a stream the gaps disappear and sync disappears.
Another common Problem is problems caused by varying pull-down in the
original. If you have some 3:2 pulldown material (say some Ads) where one
field of a frame is repeated at playback time simply decoding frame-by-frame
and re-encoding will affect timing.
Basically, its pretty complex and to get transcoding to work right all the
time you need a carefully written transcode decoder that communicates the
pulldown information to the video encoder and silence pads the audio stream
being sent to the audio encoder at the right places.
>
> Why does it go out of sync when I encode it?
> How can it go out of sync?
> Can I somehow force synchronicity? (sp?)
Andrew
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