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Old 24th November 2007, 13:31   #448  |  Link
J_Darnley
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foxyshadis is correct. The mkvmerge docs say:
Quote:
-y, --sync
Synchronize manually, delay the audio track with the id TID by d ms. The track IDs are the same as the ones given with −−identify (see section TRACK IDS).
d > 0: Pad with silent samples.
d < 0: Remove samples from the beginning.
o/p: adjust the timestamps by o/p to fix linear drifts. p defaults to 1000 if omitted. Both o and p can be floating point numbers.
Defaults: no manual sync correction (which is the same as d = 0 and o/p = 1.0).
This option can be used multiple times for an input file applying to several tracks by selecting different track IDs each time.
The silent sample only apply to vorbis tracks for AAC, AC3, DTS and MP3 it will duplicate the first frame. The docs say this list is outdated so Mosu or someone else will need to confirm.

Basically this means that once you use mkvmerge to manually sync an audio track it will be altered to be (approximately) that much longer or shorter so that if you ever need to remux you do not need to specify a delay for that track.
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