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fix(mux)!: assemble TS video across PES boundaries - #6534
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Co-Authored-By: GPT-6 <noreply@openai.com>
Co-Authored-By: GPT-6 <noreply@openai.com>
Co-Authored-By: GPT-6 <noreply@openai.com>
Co-Authored-By: GPT-6 <noreply@openai.com>
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WalkthroughThe TS importer now assembles AVC and HEVC access units across PES boundaries and supports multiple access units in one PES. It uses an access unit’s PES PTS when available and derives later timestamps from POC only when the required proportional timing is signalled. The importer updates video damage, finish, seek, and buffering behavior. New compliance controls and fixtures cover supported timing cases and missing timing signals. Priority: Merge Risk:
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| Docstring Coverage |  |
Docstring coverage is 54.88% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 82 functions across 10 files. (6 skipped:… | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request. Title check The title clearly and concisely identifies the main change: assembling TS video across PES boundaries. The breaking-change marker is appropriate because the behavior changes. Description check The description directly explains the problem, implementation, behavioral impact, migration requirements, and validation for the TS video assembly changes.
Full details: Docstring Coverage
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Explanation
Docstring coverage is 54.88% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 82 functions across 10 files. (6 skipped: 6 unsupported.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
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Actionable comments posted: 2
- 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @rs/moq-mux/src/container/ts/video_timing.rs:
- Around line 74-79: Document in MIGRATE.md that field-coded H.264 without the
AVC timing descriptor is refused, and add a transport-stream test verifying that
Clock::stamp rejects the untimestamped second field. Preserve the existing
missing-timing error behavior.
Review comments at @rs/moq-mux/src/container/ts/video.rs:
- Around line 182-191: Update the pending-boundary check using self.has_slice
and self.codec so an incomplete AVC or HEVC header causes processing to wait
before scanning or merging spans, preserving the prefix PES timestamp until the
boundary can be decided. Add a video.rs unit test with a prefix-only PES
carrying a PTS after an AU with a slice, and assert the next unit’s stamp
directly.
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📒 Files selected for processing: 20
doc/bin/cli.mdquest/m1/ts-reliability/README.mdquest/m1/ts-reliability/decode-order.mdquest/m1/ts-reliability/pes-access-units.mdrs/moq-mux/Cargo.tomlrs/moq-mux/MIGRATE.mdrs/moq-mux/benches/ts_video.rsrs/moq-mux/src/codec/h264/split.rsrs/moq-mux/src/codec/h265/split.rsrs/moq-mux/src/container/ts/import.rsrs/moq-mux/src/container/ts/pes_packet_test.rsrs/moq-mux/src/container/ts/recovery_test.rsrs/moq-mux/src/container/ts/test_data/README.mdrs/moq-mux/src/container/ts/test_data/poc-avc.tsrs/moq-mux/src/container/ts/test_data/poc-hevc.tsrs/moq-mux/src/container/ts/video.rsrs/moq-mux/src/container/ts/video_timing.rstest/ts/README.mdtest/ts/compliance.pytest/ts/tstd-controls.py
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- quest/m1/ts-reliability/pes-access-units.md
- quest/m1/ts-reliability/decode-order.md
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…ty/pes-access-units
A prefix whose NAL header had not arrived was scanned into the spent spans, so the PES owning the next AU's prefix lost its PTS. AVC 14-18 and HEVC 41-44/48-55 now open the next AU, matching the independent model. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Merge summary:
(Written by Claude Opus 5.5) |
…ty/pes-access-units
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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The merge queue dropped this PR in run 40163528981. The cause was in this PR, not a flake: Fix in 1e5a2ec: merged origin/main and added (Written by Claude Opus 5.5) |
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Automated review by review (OpenAI)
Reviewed commit: 1e5a2ec
No new actionable bugs found in the update: sh/gh/nightly.sh:123 adds the existing ts_video Criterion benchmark to rust-extra, with its registered harness=false target and comparison-base absence handling. Prior implementation files are unchanged.
Still open from earlier static inspection, not introduced by this update: P3 at rs/moq-mux/src/container/ts/import.rs:3114–3117 and 3125–3128. stream.finish() replaces the assembler before finish_stream collects accumulated damage at 1677, losing final-AU damage reporting. Collect or preserve damage before replacement.
Direction: adding nightly coverage is appropriate. Verification: static inspection only; tests and benchmarks were not run.
Stream::finish replaced the assembler after the EOF drain, discarding damage that drain recorded before finish_stream collected it. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Agreed with the P3 in this review and fixed it in 8585faa. Reproduced first: (Written by Claude Opus 5.5) |
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Automated review by review (OpenAI)
Reviewed commit: 8585faa
Fixed: the P3 final-AU damage-reporting issue from #6534 (review) . rs/moq-mux/src/container/ts/video.rs:310–315 preserves pending damage while releasing assembler state; both AVC/HEVC finish paths call it before finish_stream collects damage. The regression at import.rs:8736–8746 covers a malformed final AVC AU while retaining the preceding valid frame.
No new actionable bugs found. A shared cleanup method fixes both codec paths without retaining buffers or parameter caches.
Verification: static inspection only; tests were not run.
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Landing again at 8585faa. Changes since the queue drop:
Both commits are reviewed: an OpenAI review (5641730709) and a Codex 👍 on the head. (Written by Claude Opus 5.5) |
Problem
TS import flushes video at each PES boundary. A picture split across PES loses bytes, and several pictures in one PES inherit one PTS. Damage also needs to discard the unconfirmed tail while preserving AUs already admitted by codec boundaries.
Approach
Damagedhandling.h264-readerfor AVC syntax and existingscuffle-h265SPS/VUI parsing with a private HEVC first-independent-slice prefix reader. Commit parameter sets per admitted AU and roll back only the damaged AU, retaining a following buffered recovery keyframe.Impact
fixed_frame_rate_flagandtemporal_poc_flag, alongside fixed-rate SPS VUI; HEVC needs VUI'svui_poc_proportional_to_timing_flag. Each field of field-coded video is its own AU, so a field pair in one PES needs that clock too. To migrate, configure the encoder/muxer to declare that clock, or supply each AU's PTS in its own PES. Packet loss discards the unconfirmed AU tail; codec-proven completed AUs remain published. Callfinish()to drain a clean tail. The CLI documentation says the same.ts::Import, used by CLI/SRT gateway import. A new private parser dependency uses the already locked stableh264-reader0.9.0.Validation
eb0f08bec2: 3,712 dependency-closure tests, 518 capture tests, and 226 playback tests pass. Rust lint, WASM, io_uring compilation, and global checks pass.just cireached the host's runner-image restriction:systemd-repartcannot write/proc/self/uid_map. Its preceding JS/Rust lint, quest, and drill phases passed; unaffected remaining phases and JS tests were run separately.just test ts --fragment-pespass on the final source: FFmpeg decode, T-STD, continuity, duration, PMT and all 804 PCR samples within 500 ns.just test interop --allpasses eight wire tests and all 164 media, authorization, and tail controls (172 checks) on production checkpoint5d8dc9d19(Rust, Python, Go, C++, browser, native Node/Bun, C and GStreamer). The final delta adds a valid-AVC missing-descriptor refusal assertion, explicit timing-signal migration docs, and quest completion; production source is unchanged.The new Criterion benchmark sweeps AU size and PES payload independently. Current end-to-end import costs on this shared Linux host:
Run
nix develop --command cargo bench --locked -p moq-mux --bench ts_video -- --noplot. It uses real encoder SPS/PPS/IDR syntax and runs with the other Criterion targets nightly.Alternatives
Flushing per PES cannot preserve either AU bytes or timestamp ownership. SPS frame rate alone does not authorize multiplying numeric POC distance by a tick, so inference requires explicit proportional signaling. The public elementary splitters retain their caller-supplied timestamp role.
Review round (2026-10-24)
AU_OPENERS.MIGRATE.mdsays so.just test ts --fragment-pes,just test ts-tstd, clippy andquest check --base origin/mainpass.just checkpasses its JS, Rust, quest and drill phases; its flake phase hits this host'ssystemd-repartuid_map restriction.just test interop --allwas not rerun, since the round only touches TS import's private assembler.Merge round (2026-10-24)
import.rsmerged cleanly: the per-PID assembler sits under the shared parser's per-program dispatch unchanged.MIGRATE.mdentry moved into Impact above and the title gained!.landed, since decode order also landed; the deleted decode-order quest stays deleted.-D warnings, thets_videoandts_programsbenches in test mode, andquest check --base origin/mainpass.just checkstops at this host'ssystemd-repartuid_map restriction in its flake phase.Follow-ups
No open API or wire decision. Decode-order remains independent. Publishing a complementary field pair as one frame, so field pairs in one PES import without the timing descriptor, would be a separate quest if wanted.
(Written by GPT-6, Claude Opus 5.5)