---
url: https://doc.moq.dev/bin/srt.md
description: SRT contribution and playback
---

# SRT

`moq import srt` accepts SRT pushes (`--listen`) or pulls from a remote SRT
source (`--connect`); `moq export srt` serves SRT to players or pushes to a
remote. The payload is MPEG-TS, so the same codecs as [`import ts`](/bin/cli)
apply: H.264/H.265 video and AAC, MP2, AC-3, or E-AC-3 audio. Ingest logs the
same per-stream lines as `import ts`, under an `srt{path=...}` span: an
elementary stream that stopped delivering access units, audio frame sync lost,
and damaged units refused. Damage drops that unit and keeps the session alive;
video closes its group at the break and resumes at its next keyframe, freezing
for up to one GOP.

```bash
# Accept a contribution feed and publish it
moq --connect https://relay.example.com/anon --broadcast event.hang import srt --listen '[::]:9000'

# Serve a broadcast to SRT players
moq --connect https://relay.example.com/anon --broadcast event.hang export srt --listen '[::]:9000'
ffplay srt://localhost:9000

# Pull from a remote encoder
moq --connect https://relay.example.com/anon --broadcast event.hang import srt --connect 'srt://encoder.example.com:9000?streamid=live/cam'
```

A multi-program feed is refused, as with `import ts`, unless `--program`
picks one: `--program 2` imports program 2 alone, and `--program all`
publishes each program as its own broadcast (`event.hang` becomes
`event/1.hang`, `event/2.hang`, and so on).

```bash
moq --connect https://relay.example.com/anon --broadcast event.hang import srt --listen '[::]:9000' --program all
```

`--latency` sets the SRT receive buffer and doubles as the skip threshold on
export. Export paces each SRT payload on the media clock, and re-anchors that
pacing on a declared marker, so a restarted timeline plays out from the
live edge instead of stalling until it catches up. A `--connect` URL needs a `streamid` query or a path; a listener
bridges one `--broadcast` and ignores the stream id it is offered. The
library is [`moq-srt`](https://docs.rs/moq-srt).