Quote:
Originally Posted by Mosu
That's because the vp8.mkv sample is not a Matroska/WebM file despite its file extension (it doesn't start with an EBML signature etc). Maybe it's a raw bitstream. Those are not supported yet by mkvtoolnix, mostly because the official tools only output into Matroska/WebM anyway.
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Oops, you're right, it's a raw bitstream, not MKV.