Full HD videos crawling ugly

[rvm]

Maybe then it's a problem in that particular file only.

[VPupkin]

It's not about a corrupt file, it's about that demux mode I mentioned. Why does it cause a problem?

[rvm]

I don't know. If there's something new in the format I guess mpv and mplayer will eventually support it.

[VPupkin]

I removed that demuxing mode by converting the file with mkvmerge, but the problem remained. Then I ran the mkclean tool on the converted file and it still showed some warnings about cluster timecodes and void data, so I guess demux mode was not the problem of the file - it was generally badly compressed.
As for this header stripping, it's not new. I read the Matroska site and it says that this option has been a part of the format for a long time: