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Which settings to use to get video/audio in sync

post #1 of 8
Thread Starter 
I ripped some video from a Sony Handcam into an .avi file. I have been trying to convert it to another format, basically anything smaller that can be edited by someone else. Towards the end of the converted videos the sound is no longer in sync and a second or so behind the video.. What do I need to do to fix that?

I'm not sure what all I need to change, I have options for fps, bitrates, sample rate, etc.

The .avi itself is fine and looks good, so the source should be fine...
post #2 of 8
super video converter is imho the best and easiest freeware.

unfortunately, you have to wade through their bad website to find the dl link.

http://www.erightsoft.com/SUPER.html
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post #3 of 8
MMG is very light weight and I use it all the time for syncing audio/video.
http://www.bunkus.org/videotools/mkv...downloads.html

Drag the video to the program or click the add button.
Select the audio and change the number in the red box and click Start muxing.

Takes almost no time to do since it isn't converting anything but changing the time of the audio.




If you have VLC you can use that to test your sync.
Click whats in the blue box, then go to synchronization and the number in the red box just use that for MMG.


Edited by LiLChris - 2/17/11 at 11:50am
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post #4 of 8
Thread Starter 
Hmm, its strange though, I think the beginning of the vid. the sound is in sync, but it gradually gets farther and farther out of sync until the end it is way out.. Wouldn't that be more of a fps or bitrate issue?
post #5 of 8
Oh you got me there, no idea on bitrate but you shouldn't have to mess with FPS since that might change the quality of your video.
That happen to me on one of my videos I never got around fixing it.
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post #6 of 8
Thread Starter 
Well supposedly I am using the source settings, same FPS, resolution, etc. I don't really know what bitrate does but it doesn't seem to change the timing, with anything I set it at..
post #7 of 8
Adding a static delay mkvmerge won't help - the fact it's drifting apart means the video and audio are playing at different rates.

You probably assumed a different FPS (that is, "defined" a FPS - just told the video to play at a different rate without changing the video itself) or sample rate while converting and now it's drifting out of sync. If your video is long enough, even something like 30 fps vs 30000/1001 fps (29.97~) can do that. It takes like 5 hours for a noticeable difference to manifest with that little difference, though.

Another possibility is whatever you used to convert is dropping video frames or audio samples regularly for some reason, so it drifts out of sync. The solution is to use a different converter because it sucks.
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post #8 of 8
Thread Starter 
Quote:
Originally Posted by Coma View Post
Adding a static delay mkvmerge won't help - the fact it's drifting apart means the video and audio are playing at different rates.

You probably assumed a different FPS (that is, "defined" a FPS - just told the video to play at a different rate without changing the video itself) or sample rate while converting and now it's drifting out of sync. If your video is long enough, even something like 30 fps vs 30000/1001 fps (29.97~) can do that. It takes like 5 hours for a noticeable difference to manifest with that little difference, though.

Another possibility is whatever you used to convert is dropping video frames or audio samples regularly for some reason, so it drifts out of sync. The solution is to use a different converter because it sucks.
Ah that makes sense, I had noticed a it dropped a few frames during recording. But even if it ended up dropping a total of 30, at 30fps that's 1 sec lag. Probably the problem right there, didn't think of that though..
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