Converting Dolby Vision to HDR10

[gnattu]

The one-liner is known to work bad with the mkv muxer of ffmpeg because ffmpeg's own mkv muxer tries to do too many smart things during stream coping and it will fail the process when the dolby vision metadata is removed for some videos. You have to remux to a better implemented muxer like mp4, and then from that mp4 to remux back to mkv.