Another observation - error I originally got was: x265 [error]: maxCUSize must be the same for all encoders in a single process
So, I looked at log x265 generated for different presets, and I found out that following presets: ultrafast, superfast, and veryfast, show: x265 [info]: CU size : 32 whereas, following presets: faster, fast, medium, slow, slower, veryslow, and placebo show: x265 [info]: CU size : 64 Now coming back to the original error x265 shows: "x265 [error]: maxCUSize must be the same for all encoders in a single process" This probably solves the problem (temporarily). Presets mentioned above have their own CU size, hence not all of them are interchangeable. I can see this feature is currently not available fully with libx265 - maybe it will be added later on.
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