GStreamer Plugin

Two elements: moqsink publishes a pipeline to a relay, moqsrc subscribes to a broadcast and exposes one source pad per rendition.

# Inspect (Nix bundles the plugin with gst-launch)
nix shell github:moq-dev/moq#moq-gst --command gst-inspect-1.0 moq

# Play the public test broadcast
nix shell github:moq-dev/moq#moq-gst --command gst-launch-1.0 -e \
  moqsrc name=s url=https://cdn.moq.dev/demo broadcast=bbb.hang \
  s.video_0 ! queue ! decodebin3 ! videoconvert ! autovideosink \
  s.audio_0 ! queue ! decodebin3 ! audioconvert ! autoaudiosink

# Publish a test pattern
gst-launch-1.0 -e videotestsrc is-live=true ! x264enc tune=zerolatency ! h264parse \
  ! video/x-h264,stream-format=byte-stream,alignment=au ! mux.sink_0 \
  moqsink name=mux url=https://cdn.moq.dev/anon broadcast=<your-name>.hang

Install via apt install gstreamer1.0-moq or dnf install gstreamer1-moq (Install), or build with cargo build -p moq-gst and point GST_PLUGIN_PATH_1_0 at the output. http:// URLs pin the relay's certificate fingerprint automatically, so local development needs no TLS setup. That scheme is for localhost only: the fingerprint is fetched unauthenticated and the WebSocket fallback runs as cleartext ws://, so use https:// for anything else.

moqsink

Codec	Caps
H.264, H.265, AV1, VP8, VP9	video/x-h264, video/x-h265, video/x-av1, video/x-vp8, video/x-vp9
AAC, MP3, Opus	audio/mpeg, audio/x-opus
Opaque data	application/octet-stream (raw bytes on a named track, one group per buffer)

Each sink_%u request pad is one track. Pad properties: track names it (default: after the codec), container=loc publishes it as LOC instead of the legacy hang container, and track-status/track-error report its lifecycle. Element properties: url, broadcast, tls-disable-verify, quic-idle-timeout, quic-keep-alive, and read-only status, connected, moq-version, and estimated-send-bitrate. The sink reconnects for as long as the pipeline runs and only reports failed on an answer redialing can't change, such as a rejected token.

moqsrc

Pads are named by kind and appear as the catalog announces renditions: video_0, video_1, audio_0. Link the pad you want by name; the terse moqsrc ! decodebin3 form links only the first pad offered, which may be audio. Each pad sends EOS when its rendition ends. Properties: url, broadcast, tls-disable-verify.

Debug with GST_DEBUG=*:4 for GStreamer and RUST_LOG=debug for the plugin.