Erik Slagter <erik@slagter.name> wrote:
> Are you saying that avi's produced by mencoder always their audio AND
> video start at the first frame list entry AND that these are always a
> video and audio sync that actually belong to the same moment in time?
Yes, mencoder skips and/or duplicates frames to keep the video perfectly
synchronized with audio. There is one minor exception (see
-audio-delay) but it's quite rare.
> That is not my experience, two years ago I used mencoder to create
> avi's with mpeg4-2 for my media player, and they always had a/v sync
> issues while mplayer played them fine. This looks like a/v skew in
> the file.
Mencoder simply doesn't have any code that could do what you're accusing
it of doing. What you describe must have been the result of a bug
somewhere.
> I'd really like mencoder to produce two raw streams at the same time
> (either transcoded or original) while mencoders takes care that the
> a/v sync as expressed in the timestamps of the input file, are
> reflected in the raw output files, by dropping or repeating audio or
> video frames.
What else could Mencoder possibly do? It either does exactly that to
maintain A/V sync, or it does nothing at all (upon request).
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