Re: [Cellar] On the multiplicity of Info elements

[Moritz Bunkus <[e-mail]>]

Hey,

> From a sample set of 59,881 Matroska files uploaded to archive.org
> only 119 of them include CRC-32 Elements. Almost 0.2%! Additionally
> the webm Document Type lists the CRC-32 Element as unsupported. So I
> think it’s true that it’s rarely bothered with. The implementation of
> CRC-32 Elements does add many complications and perhaps demand has
> been too low to resolve them. Moritz may have comments here.

That's pretty much spot on. The CRC32 element was added comparatively
late; a lot of muxers had already been created by that time.

Most requests I've received where more concerned with error recovery
than with error detection. This is something that CRC32 wasn't meant
for; additionally CRC32 elements weren't meant to be written in the
cluster elements which make up the bulk of a Matroska file's data.

Yes, there is a feature request[1] for adding support in mkvmerge and
mkvinfo. It has been created in 2010, but except for those two people
mentioned in the bug I haven't really received any other requests for
such a functionality.

Kind regards,
mosu

[1] https://github.com/mbunkus/mkvtoolnix/issues/543