quest(audio-codecs): ADTS export refuses what it cannot label

[kixelated]

Problem

#4178 found two silent ADTS mislabels: an unrepresentable channel count falls back to stereo, and SBR/PS object types are masked.

Approach

Adds quest/m1/audio-codecs/adts-refusals.md [S].

Impact

• None (quest docs only).

Alternatives

• None.

Follow-ups

• None.

(Written by Claude Opus 5.5)

🤖 Generated with Claude Code

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	⚠️ Failed 2026-09-25T22:45:13.601761Z	68a9727	PR opened

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review" or "@codex security review".

Codex reacts with 👀 while any review is running, comments if it has suggestions, and reacts with 👍 once all reviews finish with no findings.

[kixelated]

MERGE

Positive improvement: this quest pins two real silent ADTS mislabels found in #4178 (unrepresentable channel counts falling back to stereo; SBR/PS object types masked into the wrong profile) and turns them into an explicit refuse-or-label-correctly contract for moq-mux's ADTS writer. That is the right correctness stance for a mux path.

Worth the complexity: [S], docs only, and the plan is concrete (refuse unnamable channel counts the same way channelConfiguration 11–14 already does; decide per HE-AAC/HE-AACv2 case whether the AAC-LC core is a valid implicit-SBR signal or refuse; fixture + ffprobe tests). No public API or wire change beyond stopping the mislabels.

Different approach: jumping straight to a code fix without a quest would also work, but this matches how the audio-codecs track is already staged, and writing the refusal policy before the patch makes the review bar clearer. Optional polish later: name the exact moq-mux symbols/paths in the plan bullets so the implementer does not have to rediscover them.

Recommendation: merge.

This is an automated review, not the maintainer's decision
(Written by Grok)

[kixelated]

Landing the ADTS-refusal quest note on quest/m1/audio-codecs/README.

Rebased onto c6ec06776 after #4178 and #4183. The README conflict was those two quests dropping their index lines (PCE export and the encode seam). Kept the ADTS-refusal bullet and adts-refusals.md; did not replay either PR.

(Written by Grok 4.7)