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  1. Member
    Join Date: Sep 2009
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    I'm Syncing .avi Audio To .MKV Video

    I'm using mkvmerge & I don't know what numbers to put in the stretch & delay fields. . .

    I have a video file that's 1:45:25.944 & the audio is 1:45:24.359, which is a difference of 1.585

    What settings do I put on the audio to make it sync perfectly?

    Thanks.
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  2. Member
    Join Date: Sep 2007
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    Try the ratio , not difference. If that doesn't work, try the reciprocal

    If they are out of sync at the beginning you may need a delay as well
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  3. Member
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    Originally Posted by poisondeathray
    Try the ratio , not difference. If that doesn't work, try the reciprocal

    If they are out of sync at the beginning you may need a delay as well
    How???


    I don't know how to do this stuff , I need instructions. . .

    all I know is I put the audio on successfully, & it is out of sync. . .

    but I am totally unfamiliar with this program....
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  4. Member
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    With the video & audio loaded, highlight the audio track, go to the format specific options tab, and enter the ratio in "the stretch by" box, press start muxing

    How bad is it out of sync? Judging from the #'s you gave it should be barely perceptible. If it's way off, you have other problems

    Is the audio correct? i.e. are you sure it's the correct version?

    Does it have errors/dropouts? If so, you won't get it in sync using this method

    Does it start in sync? and slowly go out of sync? if it's out of sync at the beginning you probably have to enter a delay as well
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  5. Member
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    it's not that off. . .I'm just nit picky. . .but it's off by half a second throughout. . .& the sounds seem to to fall behind (in sequence) as the video goes on. . .but only by a little. But as the video goes on it becomes slightly more noticeable.
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  6. Member
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    If it's a constant delay scenario, video ahead of audio, you can delay the video by that set amount at the beginning

    Similar instructions: highlight video track, format specific options tab, enter delay in ms, press start muxing

    But since it seems like you have both (different offset and different lengths), you will have to do a combination of both
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  7. Member
    Join Date: Sep 2009
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    I don't know what numbers to put in the delay & stretch fields
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  8. Member
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    Originally Posted by ThreatTV
    I don't know what numbers to put in the delay & stretch fields
    I can help you any more with specfics without examining it myself. You can't do this perfectly with only the information you've provided.

    You have to try some values, there will be some testing with trial and error involved here

    You said about 1/2 second throughout so try 500ms for the video delay. If it's off, try a bit more or a bit less etc...

    Try getting the inital sync first (at the beginning), then the stretch.
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