Bug with multipass and HDR

[afm72]

Hi, Using 2-pass with HDR sources and the option --multi-pass-opt-rps

enabled, glitches appear in every minute of encoded video. tried this with x265 versions from 2.7 up to 3.4 and it gets fixed by disabling option --multi-pass-opt-rps. by glitch I mean dropping 4 to 5 frames as can be seen in the attached video multi-pass-opt-rps.mkv at frame number 242 it jumps to 247 and this issue is not in the second video no-multi-pass-opt-rps.mkv that isn’t using --multi-pass-opt-rps.

Thanks for all your work and providing this free encoder.

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