feat(moq-cli): wire verbatim MPEG-TS carriage (mpegts catalog) through publish/subscribe

[t0ms]

Summary

#1815 landed generic verbatim MPEG-TS carriage in the moq-mux library (the mpegts
catalog section + per-PID verbatim tracks), but listed CLI wiring as out of scope.
Today moq-cli still uses the media-only Catalog<()> path, so SCTE-35 / teletext /
DVB AC-3 / private streams are dropped when you go through moq pub | relay | moq sub.
This issue wires the Ext (mpegts) catalog through the CLI so a contribution TS feed
keeps its ancillary streams end-to-end. Part of #1799.

Why

This is the only thing standing between the merged #1815 carriage and being able to
actually exercise it from the CLI. Without it the verbatim lane is library-only.

Changes (the library is already generic; this just selects Ext)

• rs/moq-cli/src/publish.rs: in the PublishFormat::Ts arm build a
  moq_mux::catalog::Producer::<moq_mux::container::ts::catalog::Ext>::new(..) and a
  ts::Import over it; change PublishDecoder::Ts to hold
  ts::Import<moq_mux::container::ts::catalog::Ext>. (The other formats keep ().)
• rs/moq-cli/src/subscribe.rs::run_ts: use ts::Export::with_ts(self.broadcast, self.catalog)? instead of Export::with_catalog_format(..) (.with_latency chains).
• Relay needs no change (it forwards the extra tracks + mpegts section transparently).

Acceptance criteria

• moq-cli publish ts | relay | moq-cli subscribe --format ts preserves the undecoded
  streams (SCTE-35 section PIDs, teletext/AC-3 PES) with original PIDs, PMT descriptors,
  and PES stream_ids, matching the feat(moq-mux): generic verbatim MPEG-TS carriage (mpegts catalog section) #1815 library round-trip.
• A round-trip integration test over a fixture with at least one verbatim PES and one
  section PID.

Out of scope

• DTS / B-frame timestamps (separate issue).
• PCR-PID preservation, MPTS (still SPTS-scoped per feat(moq-mux): generic verbatim MPEG-TS carriage (mpegts catalog section) #1815).
• Byte-for-byte transport fidelity (the opaque whole-mux lane, Option B in Proposal: broadcast contribution profile for MoQ (faithful TS / satellite replacement) #1799).

Branch

main (additive CLI usage; the moq-mux API already merged to main).
(Written by Claude)

[coderabbitai]

🔗 Related PRs

#1781 - fix(hang): omit empty HEVC constraint component in codec string [merged]
#1808 - moq-gst: fix plugin license + broadcast-aligned timestamps [merged]
#1809 - fix(moq-gst): deterministic moqsrc pad names so CMAF playback works [merged]
#1812 - fix(moq-mux): carry all distinct SPS/PPS/VPS through transmux, not just the last seen [merged]
#1815 - feat(moq-mux): generic verbatim MPEG-TS carriage (mpegts catalog section) [merged]

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[t0ms]

Verified end-to-end on main @ 6893b1c4 (#1815 + #1842 + #1843)

Re-ran a real broadcast capture through publish -> relay -> subscribe and compared the subscriber output to the source. Source is a live CNN International EMEA HD recording: 1080i H.264 + MPEG-1 audio + AC-3 + DVB teletext + 3x SCTE-35.

Test rig (matters): the feed is pushed byte-faithfully with TSDuck so every PID/PSI/timestamp reaches the publisher unaltered:

tsp -I file seg.ts -P regulate | moq-cli publish --url … --broadcast … ts
moq-relay localhost.toml
moq-cli subscribe --url … --broadcast … --format ts > sub.ts

Note for anyone reproducing: do not stage the feed through ffmpeg -c copy. ffmpeg's default stream selection silently drops the ancillary PIDs (AC-3/teletext/SCTE-35) and its mpegts muxer rewrites PIDs/timestamps, which makes it look like MoQ dropped them. Use raw TS (tsp, cat, or a real SRT/UDP source).

Verbatim carriage (#1835 / #1842 / #1815): PASS

All 7 elementary streams survive with their original PIDs:

Stream	Source PID	Subscriber PID
H.264 video	0x6f	0x6f
MPEG audio	0x79	0x79
AC-3	0x7b	0x7b
DVB teletext	0x83	0x83
SCTE-35	0x8d/0x8e/0x8f	0x8d/0x8e/0x8f

PCR PID preserved (0x6f). Publisher log shows the verbatim tracks 0.ts–4.ts created alongside 0.avc3 / 0.mp2, with no "unsupported / dropping" warnings. (Before the fix the same feed collapsed to 2 streams renumbered to 0x1001/0x1002.)

DTS / B-frames (#1836 / #1843): PASS

Over the captured GOPs: non_monotonic_dts = 0 and dts_gt_pts = 0 (DTS strictly increasing and <= PTS), a fully clean decode (ffmpeg -v error -i sub.ts -f null - prints nothing), and playback no longer needs -fflags +igndts. The reorder-depth reserve (PES DTS folded into the catalog jitter, import.rs) sizes correctly for this feed's ~5-frame reorder.

Both issues are confirmed fixed for native broadcast passthrough. Residual fidelity gaps that this lane does not yet preserve (SI/SDT service identity, constant mux-rate / PCR-accurate pacing, PMT PID, EIT/TDT) are written up separately so they don't muddy these two.

(Written by Claude)