AC4 Codec Mapping

[optimiz]

AC4 Codec Mapping

[dericed]

I suggest referencing the proposal on the CELLAR list serv. For support for an AC4 Mapping, the codec spec document at https://github.com/Matroska-Org/matroska-specification/blob/master/codec_specs.md would need adjustment., to clarify what private data to store, make the id official, and describe it.

[mbunkus]

I appreciate you getting the ball rolling. I so second @dericed in that the discussion should probably be had on the mailing list for improved visibility. A good starting place would be the mapping for MP4 (I assume that it exists already).

[optimiz]

Will do, @dericed, thanks. Yes, @mbunkus, the mapping for MP4 and 3GPP is in Annex E of the ETSI Digital Audio Compression (AC-4) Standard Part 1 v1.2.1 linked above, under the heading "AC-4 Bitstream Storage in the ISO Base Media File Format", as registered with Apple's MP4 Registration Authority. I'll be sure to include this info to the mailing list.

FYI - The specific "code point" registration link is...
MP4 Registration ETSI AC-4