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Fundamentally, it's based on your editing needs, and extras like rating, platform, additional functions, pricing also matter. With so many MKV video editors around, it's significant to select a proper MKV editor for video editing. Disable unwanted MKV audio and subtitle tracks

Going back to the MP4 HEVC spec, it specifically states only SEIs are allowed to go into the header which apply to the entire stream without exception - and HDR metadata for example can technically change (even if current HDR10 standards don't allow that, the bitstream does).Free Download for Mac OS X 10.6 or later Table of Contents The reason SEI is in-band with the bitstream is that it can change on a per-GOP basis, but unlike SPS/PPS etc its not directly referenced by the frames with a numeric ID, so the active SEI is infered by the position in the bitstream (ie. I do not know if -repeat-headers is required to repeat SEI, but from this logic it shouldn't be. check the MP4 H264 config box, it doesn't hold SEI, and Matroska models after the MP4 format, although it appears HEVC does, but limits the types of SEI that are allowed to be in there). SEI is not technically meant to go into the headers, only SPS/PPS/VPS are (ie. So for x265 users planning on using HDR the -repeat-headers parameter is recommended. But mkvmerge doesn't do this (maybe it should?). Or the muxer would need to put the SEI into the header of e.g.

Video metadata editor mkv