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Re: [Cellar] shepherd review of Matroska: part 1

Michael Richardson <mcr+ietf@sandelman.ca> Wed, 06 July 2022 17:45 UTC

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From: Michael Richardson <mcr+ietf@sandelman.ca>
To: Steve Lhomme <slhomme@matroska.org>, cellar@ietf.org
In-Reply-To: <01ddd325-18a0-a9be-f3c1-1995bfa97e8b@matroska.org>
References: <1216608.1654521891@dooku> <a0de8e0c-b163-efbf-3c76-9cfd38faa4bc@matroska.org> <01ddd325-18a0-a9be-f3c1-1995bfa97e8b@matroska.org>
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Date: Wed, 06 Jul 2022 13:45:17 -0400
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Subject: Re: [Cellar] shepherd review of Matroska: part 1
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The IDNITS has a few complaints:

https://www6.ietf.org/tools/idnits?url=https://www.ietf.org/archive/id/draft-ietf-cellar-matroska-11.txt

A bunch of downref concerns which are probably all just missing references.
Let me know if I can help track those down.

Miscellaneous warnings:
----------------------------------------------------------------------------

  == The expression 'MAY NOT', while looking like RFC 2119 requirements text,
     is not defined in RFC 2119, and should not be used.  Consider using 'MUST
     NOT' instead (if that is what you mean).

     Found 'MAY NOT' in this paragraph:

     Cluster Elements contain the content for each track, e.g., video
     frames.  A Matroska file SHOULD contain at least one Cluster Element. The
     Cluster Element helps to break up SimpleBlock or BlockGroup Elements and
     helps with seeking and error protection.  Every Cluster Element MUST
     contain a Timestamp Element.  This SHOULD be the Timestamp Element used
     to play the first Block in the Cluster Element.  Cluster Elements contain
     one or more block element, such as BlockGroup or SimpleBlock elements.
     In some situation, a Cluster Element *MAY NOT* contain any block element,
     for example in a live recording when no data has been collected.

I suggest rewording:

     In some situation, a Cluster Element *MAY* contain no block element,
     for example in a live recording when no data has been collected.

--
Michael Richardson <mcr+IETF@sandelman.ca>   . o O ( IPv6 IøT consulting )
           Sandelman Software Works Inc, Ottawa and Worldwide

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