lipsync AC3 soundtrack?

[shun]

What kind of tools can be used to sync up an avi with AC3 sound, or at least mp3 sound?

[guns1inger]

In what way ?
In what type of container ?

If the audio is out by a constant amount then all that is needed is a simple delay adjustment. DelayCut can do this, as can many authoring tools and virtualdub.

If the audio drifts out over time, perhaps because of a poor format conversion, it becomes a bit more complex. Audacity or BeSweet can be used, depending on the file and the need.

However to be more specific requires a lot more information from you

[shun]

what if the sound is slower than (trailing behind) the video and is in an mkv?

[guns1inger]

Use MKVExtract (with mkvtoolnix in the same folder) to extract the audio and video streams.

Using Media Player Classic : File -> Open, open the video stream using the Open field, and the audio stream using the Dub field. Play the pair (don't scrub, just play), and use the + and - keys on the numpad to work out the delay.

Once you have the delay, use DelayCut to change the delay on the AC3 file.

Finally, use mkvMerge GUI to create a new mkv file with the audio and video no in sync.

[shun]

that was great, thanks.