The audio on my MP4 video starts fine, gets progressively slower

[gallant205]

at about 90 minutes, the audio is 200 ms slow. Obviously when I fixed it at the end, the beginning was off. I used to know and had a permanent software fix. Have lost it- don't even know if it worked on MP4's, maybe just AVI's. Help?

[babygdav]

You'd have to extract the audio, restretch it to match the video.

Or restrech the video to match the audio.

Audacity, audition etc can work on the audio.

Any good video editor can retime the video.