Thanks so much for the dev versions!
2020.06.30.1 fixes the AviSynth crash.
However, the Vapoursynth problem remains. On my test, it ran what looked to be normally at about 45 fps until it gets to 100%. Then it keeps going, and speeds up, as estimated file size goes down. I stopped it at over 2000%, running at 323 fps, with estimated file size of 2.38 mb.
[attachment=926]
2020.06.30.1 fixes the AviSynth crash.
However, the Vapoursynth problem remains. On my test, it ran what looked to be normally at about 45 fps until it gets to 100%. Then it keeps going, and speeds up, as estimated file size goes down. I stopped it at over 2000%, running at 323 fps, with estimated file size of 2.38 mb.
[attachment=926]