ffmpeg and x265 allow you to do this too. frame-threads=1 will use 1 thread per frame addressing the issue OP mentioned, without big perf penalty, in contrary t

ffmpeg and x265 allow you to do this too. frame-threads=1 will use 1 thread per frame addressing the issue OP mentioned, without big perf penalty, in contrary to 'pools' switch which sets the threads to be used for encoding.