Synchronizing audio to video (Dual audio)

[zuja9]

Hey,

I would like to make dual audio movies from two separate avi files which contain the same video, but different audio tracks. I put the audio tracks in one file using AVI-Mux GUI but the secondary audio track is quite out of sync. I'm gonna need a software to fine-tune the generated dual avi file's A/V delay (without re-encoding anything, of course). A graphical tool (where I can slide the audio tracks below each other or the video track) would be more helpful.

Any ideas?

Thanks
Zuja

[poisondeathray]

Most media players can impart a + or - delay with keys (usually the +/- keys) , so play your avi and figure out the delay in ms when it syncs up

Then in avimux-gui, enter that delay value

This will only work if it's a constant delay issue (AV offset).

If there is a progressively worsening delay, the A/V lengths probably don't match or there are glitches somewhere in the A/V or it's a different cut.

[zuja9]

Most media players can impart a + or - delay with keys (usually the +/- keys) , so play your avi and figure out the delay in ms when it syncs up

Yeah, I know I tried this in mplayer, but it's a misery. I'm gonna need something more efficient.

[poisondeathray]

Most media players can impart a + or - delay with keys (usually the +/- keys) , so play your avi and figure out the delay in ms when it syncs up

Yeah, I know I tried this in mplayer, but it's a misery. I'm gonna need something more efficient.

What do you mean "more efficient?" It takes a few seconds to do this, and maybe a minute to "fix" it in avimux gui

Unless you have a case of the other audio problems I mentioned...

You could use a NLE like vegas or premiere which shows it graphically on a timeline, but it will re-encode and you will lose quality

The fastest/easiest way with no quality lost is the method I described.

[zuja9]

The fastest/easiest way with no quality lost is the method I described.

Is this the way dual audio releasers do it (with movies available on e.g. torrent sites)?

[zuja9]

What if I have two audio tracks originating from movie clips with different FPS, so the delay won't be constant. I can't sync it with mplayer, what can I do?

[guns1inger]

Then you first have to adjust the audio that does not match the video's framerate using something like audacity's time stretch filter, then sync it to the video.

As for existing dual audio - most are manufactured that way, not created for torrent release with dual audio.