Testing VirtualDub FilterMod release 39005 on Win10 x64 I keep getting this error when attempting to encode to x264.mp4 (8 or 10 bit) with the integrated x264 compressors:
No problem encoding to other formats, only x264.
Edit: Same with version 39148 released today.
Edit: But no such issue with the 64-bit VeeDub64.exe