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FFmpeg/Libav require a "key=value" format so it requires a "=1". So for your example: avconv -i input.mp4 -c:v libx265 -x265-params lossless=1 -c:a copy output.mp4 To confirm if it works (via command line) you should see the following log: x265 [info]: Rate Control : Lossless Refs: http://forum.videohelp.com/threads/372625-...



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