There seems to be an issue with too many threads with uvg266. While testing uvg266 I noticed that contrary to expectations encoding the same file with exactly the same parameters does not produce the same output file. Even the file sizes differ.
I used the newest 0.4.1 release and on linux and macos I did compile it myself, but on windows I used @Barough's precompiled binary. However specifying "--threads 8" does fix this issue and then uvg does produce same bitstream every time. Seems that 32 threads with Ryzen 5950x is too many for uvg, this should be fixed. If you need help, I can provide some time & effort for testing.
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