Thanks for the feedback, most issues are solved now:
- hangs while running minimized
- wrong GOP size for some fixed GOPs
- artifacts at the right side of some frames
The artifacts were caused because motion vectors could point out of the frame by half a pixel, some decoders don't like that...
Still one issue left, using Avisynth DirectShowSource with the WMV decoder sometimes won't read the stream correct during the second pass, it can skip frames or even jump back.
HC016 latest release at:
http://hcencoder.bitburners.com/