Re: [Cellar] normative references

[Jerome Martinez <[e-mail]>]

On 26/09/2022 20:34, Moritz Bunkus wrote:
> hmm, without the MatroskaCodec documentation you cannot really decode most
> of the content as it describes the format of the codec's initialization
> data stored in the CodecPrivate element as well as the format of the
> contents of the BlockGroup and SimpleBlock elements.

The split is fine because the "core" of the format is there, and codec 
private data, if any, is not part of this spec.
A basic format like WAC has no list of the codec identifiers used:
"wFormatTag     A number indicating the WAVE format category of the 
file. The content of the <format-specific-fields> portion of the fmt 
chunk, and the interpretation of the waveform data, depend on this value."
And that's (nearly, they list 4 basic values in their first spec) all.
MP4 does something similar.

So it is true that that decoding is not possible with this doc alone, 
but it does not prevent to publish this document as an independent 
document as it describes the container format, just saying that the 
description of the transported content is not part of this document, so 
MatroskaCodec may be informative only (we don't need it for checking the 
duration, for checking if it is UHD or SD, for removing an audio stream 
or for splitting a file, for example).

IMO MatroskaCodec and MatroskaTags should be informative.

AES (FIPS.197), TwoFish, WebMEncryption: really optional, so informative 
too.

Jérôme