.mkv exporting problems

[VHS_UK]

Okay, so 50fps works and 60fps doesn't.
-> How much memory is used when running the encoding, could it be you are running out of memory?
(when not using avs2yuv SalFPS3 crashes when using ffmpeg and current Avisynth, as does avsViewer -> with a bit of luck pinterf might compile a new version of the motion.dll that is used in SalFPS3)

I have 32GB of RAM, I presume that's enough memory?

I managed to do a job on the same video thanks to avs2yuv and switching to Interframe and target frame rate to 60 fps. (See debug)