I had a bad recorded file on my sony A7IV. It was a rsv file. I tried the free untrunc method and this made my rsv file back into a mp4. ALso tried wondershare recoverit and also here the preview was out of sync. So both in untrunc and wondershare the audio was out of sync.

So I thought no problem to fix this in vegas. I removed the audio from the video with "U" so i could move the audio a bit forward or backward to match the video. The problem is a few minutes further in the footage the audio already not matches again the footage from the same camera (from the side view -> A7IV)

Because this was a multicam I now tried to match the footage on the same spot with the footage from the front camera and using the audio from the front camera.

Again this worked (see samples pics) but after a few minutes again they are going out of sync. So how can fix this?

Maybe when recovering it the playback speed of the video was a bit slower or faster?