Document: draft-ietf-cellar-codec
Title: Matroska Media Container Codec Specifications
Reviewer: Mallory Knodel
Review result: Ready

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Document: draft-ietf-cellar-codec-??
Reviewer: Mallory Knodel
Review Date: 2026-06-01
IETF LC End Date: 2026-05-29
IESG Telechat date: Not scheduled for a telechat

Summary: This document describes how to map codecs into the Matroska container
format. The draft is well written and clear in purpose.

Major issues: None. Thanks for the document. The biggest challenge I faced
while reviewing this was to do my best to check out all of the different
reference documents (there are so many! and from many other standards bodies).
I guess that this is the core function of this work, to bring together many
different codecs into one standard framework. Caveat that this is a general
review and not a technical review.

Minor issues:

 * Decide whether codec is plural and if so delete all "codecs" (love an
 invariable noun).

 * There is confusion for a new reader between "Block Addition" and "Block
 Additional", both a kind of necessary mapping. What seems to be the difference
 is that the latter is about mapping additional /data/, not about adding a
 block of data. That's a nuance. It would be helpful to define this in an
 introductory paragraph. This sort of introductory paragraph can also provide a
 guide to the table of contents-- why there are mappings of codecs and blocks,
 both for audio and video, and how to handle the data within them. That
 high-level architectural explanation is missing from the doc. If it exists
 elsewhere, you could link to that and summarize.

Nits/editorial comments:

 * Also on the plural tack: You could probably say "Codec Mapping" rather than
 the plural form in most cases, just for consistency, and for the title of
 section 3 specifically, but not, say, 3.2. or 3.3..

 * 3.3.1: "doesn't contains"


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