Free tool to sync audio and video files?

[yetanotherlogin]

Hello,

I'd like to replace the bad audio in an MP4 file with a better copy available as a separate audio file.

Is there a good, easy to use (Windows) application to sync audio and video?

Thank you.

[hech54]

How long is the video?
Something like a single music video, not so bad....an entire movie? Not something I would want to try.
Are the run times/duration of the two files even remotely similar to each other?

[yetanotherlogin]

It's just a 10mn file of a conference.

There's about 30s extra at the beginning of the video file that I'll trim with eg. ffmpeg.

Ideally, I'm looking for a GUI-based solution that makes it easy to shift the audio a bit until it's in sync, and save the combo as a new file.

[jagabo]

Try VirtualDub Filtermod. Enable: View -> Audio Display.

[yetanotherlogin]

Thanks.

[hech54]

I use an old version of AviDemux to replace audio. No re-encoding of video if done properly.

[yetanotherlogin]

I'll give it a shot.