Phone, tablet and screen recordings are usually saved with a variable frame rate: the device drops or repeats frames when it’s busy, and a heavy game makes that worse. Some editors handle that badly, so the picture slowly slides away from the audio and it gets worse the longer the clip runs.
What fixes it for me:
- Before importing, convert the recording to a constant frame rate. In HandBrake: Video tab, set Framerate to the source rate (30 or 60) and tick “Constant Framerate”. Keep quality high (RF 18 to 20), it’s only a working copy.
- If game audio and voice are recorded separately, give yourself one obvious sync point at the start: a clap or a loud tap on screen. Matching one spike is much faster than matching by eye.
- Cut long sessions into 10 to 15 minute chunks before editing. If anything still drifts, it drifts less, and you can nudge each chunk by a few frames.
- Check sync at the end of a clip, not the start. If the last minute is fine, the whole clip is fine.
If your recording app has a fixed 30 fps option, locking it there often stops the drift at the source.
Has anyone found a mobile recorder that never does this?
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