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x265 Encoding Issue with MP4Box
#1
I've been using Hybrid for years without issues, but in the most recent builds I've run into a bug when using MP4 Box with HEVC encoded files.  After muxing the first GOP is completely black (i.e. first 250 frames), as if the I-frame data is missing entirely.  When I switch to ffmpeg as the mp4 muxer I end up with stuttering playback of 20fps.

I've been using as a workaround a render into .mkv and then remuxing the mkv into .mp4 using ffmpeg on the command line and that worked well until the last two versions, when the HDR metadata I need to be embedded in the hevc stream stopped being embedded into the matroska file.

As part of my troubleshooting I did a full setting reset and reinstall of the latest Hybrid version.  MP4 box crashed when the Signal PAR 1:1 was flagged, and then output video that would not decode until I flagged off RDO in the HEVC settings.

I've attached the log files for both the mp4 box and the ffmpeg encodes, and have available the output and source files in a Dropbox folder I can send you.Please, read the 'Infos needed to fix&reproduce bugs,..'-sticky before you post about a problem.
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x265 Encoding Issue with MP4Box - by sbilodeau - 29.06.2017, 23:33

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