Feature request: Data stream support

Hello,

Matroska does not currently support data tracks. From my experience working
in a moving image archive, a lot of quicktime files from Final Cut Pro can
end up with a timecode data track. I can't remember off the top of my head
if AVID MC does this as well.

The timecode always seems to exist as metadata in the actual AV streams so
the information isn't lost when the data track doesn't exist. It would be
nice if matroska supported it, though. It would be preferable to maintain
all streams within the original file when migrating to the matroska
container.

If I'm converting a v210 quicktime with multiple audio tracks to ffv1.mkv
with ffmpeg, I end up using `-map 0 -dn` (`-map 0:a -map 0:v` would also
work, but an extra condition would have to be scripted if some embedded
subtitles existed in some files).


Best regards,

Kieran O'Leary

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