The desync issue is probably caused by different frame rates. For example, an American movie is 60 FPS, while a Greek one is 50 FPS. That leads to a slow desyncining of the audio throughout the video.
If you know about this problem, then I think it’s quite easy to fix while merging the two files.
I think you need to manually adjust the length of the audio stream after you extracted it, they are usually of the common fixed sample rates (like 44.1kHz or 48kHz) and are not tied to the frame rate of the video stream (other than being the same length in time).
For such a small percentage change (a few seconds over something like an hour long) “Change Speed” in an audio editor should be good enough, the shift in pitch should not be noticeable.
The desync issue is probably caused by different frame rates. For example, an American movie is 60 FPS, while a Greek one is 50 FPS. That leads to a slow desyncining of the audio throughout the video.
If you know about this problem, then I think it’s quite easy to fix while merging the two files.
Yeah that’s what I figured, but I have no idea how to adjust the frame rate when extracting the audio stream :-(
I think you need to manually adjust the length of the audio stream after you extracted it, they are usually of the common fixed sample rates (like 44.1kHz or 48kHz) and are not tied to the frame rate of the video stream (other than being the same length in time).
For such a small percentage change (a few seconds over something like an hour long) “Change Speed” in an audio editor should be good enough, the shift in pitch should not be noticeable.
https://www.youtube.com/watch?v=pkPF8uN0bE8
I’ll give that a try, thanks!