I found the problem, it was the buffer setting from my Rme soundcard, it was on maximum because I've worked on a very demanding project before exporting the videos. Anyway I think it's a strange behavior, it's not normal to get out of sync and have a scrambled video just because the buffer was set at 4048.Not sure is related with the soundcard drivers, I don't see any relation between the buffer and the video output.
Maybe you should check it with other soundcards .
Tnx for your support .
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