You can try to ZIP the logfile, but I guess I found the reason:
Zitat[10:35:52] FFmpeg: VCEEncoderTrace: 2020-04-15 10:35:52.964 41B0 [VCEEncoderTrace] Info: SetProperty(-1) FrameSize:4096,1708
[10:35:52] FFmpeg: VCEEncoderTrace: 2020-04-15 10:35:52.964 41B0 [VCEEncoderTrace] Warning: SetProperty FrameSize failed in AMFPropertyStorageExImpl with return code:0x5
Seems the AMD VCE encoder can't handle that frame size.