PTS adjustment in FFmpeg

[ubitux]

It is possible to adjust pts with the [a]setpts filters. Unfortunately, it requires re-encoding.

It would be handy if the timestamps could be adjusted at formats level only, so it would only require remuxing to, for instance, shift timestamps.

Such option would be similar to the -y option in mkvmerge. Using our eval system would provide advanced usage.

[ubitux]

I wonder I could have missed the -itsoffset option, which allows the shift feature...