demux/ebml: Allow uint elements to have length 0 - #18351
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Section 7.2 of the current ebml spec (rfc 8794) states that uint elements with length 0 are permitted. There was a previous commit ef020c1 about 11 years ago that addressed this issue for several elements. The uint element was among these; functions like ebml_read_uint were changed, but it seems this particular section may have been overlooked. Prior to this change, mkv files with 0-length uint elements were not playable by mpv. These same files were otherwise playable or parsable without issues by other applications like ffplay, vlc, mkvinfo, etc.
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Section 7.2 of the current ebml spec (rfc 8794) states that uint elements with length 0 are permitted.
There was a previous commit ef020c1 about 11 years ago that addressed this issue for several elements. The uint element was among these; functions like ebml_read_uint were changed, but it seems this particular section may have been overlooked.
Prior to this change, mkv files with 0-length uint elements were not playable by mpv. These same files were otherwise playable or parsable without issues by other applications like ffplay, vlc, mkvinfo, etc.
Thanks.