[BUG] Audio sync problem

[Selur]

On audio tab see a preview, and there was synced.

That preview is meant to be able to listen to the original audio to know the language&co even when the streams are not flagged.
It has nothing to do with the processed output

Looking at the debug output, the Vapoursynth script contains:

....
# cutting from frame 22500 to 24000  - WARNING: This might cause synch issues
clip = core.std.Trim(clip=clip, first=22500, last=24000)
...

audio is cut using:

ffmpeg -y -ss 00:14:00.000 -threads 8 -i "F:\Be\!UPCBox\Torz\Broadway Szilveszter 2009 - 1.mpg" -map 0:1 -vn -sn -ss 00:01:00.000 -t 00:01:00.000 -acodec copy -map_metadata -1 -metadata encoding_tool="Hybrid 2021.04.12.1" "F:\Vidtemp\iId_6_aid_0_2021-05-11@19_08_12_9910_01.mp2"

Audio extraction&cutting doesn't show any errors and the audio length is reported as time=00:00:59.97.
NVEncC reports it encoded 1501 frames, which would be correct (+/- 1 frame can happen due to lots of reasons).

I can fix the problem that Vapoursynth produces one frame too much, but that probably won't fix the sync issue and I don't see a way to fix it.
(such strange things is why 'Cut Support' is *experimental*)

I'll create a dev version which will lower the 'last' frame in the Trim call by one and send you a link, but like I wrote I don't think this will fix the issue.

Cu Selur

Ps.: send link via pm.