One more quick question,
(before I google it

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I once noticed during a complex edit, only after the final cut, that the audio was shifted by a few seconds everywhere.
I then managed to synchronize it via audio using the muted audio track of the film.
I synchronized the original audio track with the audio track of the video clips.
This gave me a full hour of audio, with the corresponding video clips on top.
I then cut out the unnecessary audio sections and was saved.
Can you synchronize two video tracks based on the video information? If there is no timecode?