25.03.2025, 11:50
sorry for the late reply Selur 
here the debug log .. i just installed the latest dev version deleting any folder present before
http://www.wcn.it/debug2025.zip
the preview is showing the same thing.
maybe i'm doing something wrong..
i place the clip.. select the output as MKV, add the audio track... set the quantization to 12 (constant 1 pass)
open CUSTOM tab (vapoursynth)
select "INSERT BEFORE END"
added the code.

here the debug log .. i just installed the latest dev version deleting any folder present before
http://www.wcn.it/debug2025.zip
the preview is showing the same thing.
maybe i'm doing something wrong..
i place the clip.. select the output as MKV, add the audio track... set the quantization to 12 (constant 1 pass)
open CUSTOM tab (vapoursynth)
select "INSERT BEFORE END"
added the code.