gfavored
Nov 2003
BANNED
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safetydance hi,
What has to be done is each dat file gets converted to an mpeg file first, so that you start with 4 mpeg files.
After converting you will notice that it is not cd4 that has the worst sync, but cd1, and that being right from the start. The opposite to the orig dat's, or original final playback.
To correct the playback one must correct the skew, seeing the sync is off from the beginning of the files, but the skew must be corrected for each file. You must be very careful to make sure that the audio has been synced, when making the adjustments. See how your correction plays at different parts of the file,(beginning, middle, and end), as you preview, preferably where there is a closeup of someone talking, +or- 50ms can throw off the final audio playback in the whole movie,even though it was off only in one file, but it would be gradual.
What we are doing is not a matter of just syncing one part of the file or another part. When interleaving, and adjusting skew, the physical audio blocks of the entire file are affected, either by every 1 frame or by every 1 ms.
1000ms = 1sec
In the original encode there were more than likely bad key frames resulting from the file splits, these can cause a movie file to play back slower than it should as the movie progresses. Hence causing a sync problem with the audio of the whole movie.
I hope this helps
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02-13-2004 10:29 AM
