Live777 Core (liveion)

A Pure Single SFU Server for WebRTC.

WHIP / WHEP protocols are supported by default. When built with the rtsp feature, liveion can also act as an RTSP server: push media in via ANNOUNCE/RECORD and pull media out via DESCRIBE/PLAY.

a core SFU server, If you need a single server, use this

Current support codecs

protocol	video codecs	audio codecs
WHIP	AV1, VP9, VP8, H265, H264	Opus, G722
WHEP	AV1, VP9, VP8, H265, H264	Opus, G722
RTSP	AV1, VP9, VP8, H265, H264	Opus, G722

Current client support

Application	AV1	VP9	VP8	H265	H264	OPUS	G722
Browser whip	⭐	⭐	⭐	⭐	⭐	⭐	⭐
Browser whep	⭐	⭐	⭐	⭐	⭐	⭐	⭐
Gstreamer whip	⭐	⭐	⭐	⭐	⭐	⭐	⭐
Gstreamer whep	📺 2	⭐	⭐	⭐	⭐	⭐	⭐
Gstreamer whipinto	📺 1	⭐	⭐	⭐	⭐	📺 1	⭐
Gstreamer whepfrom	📺 2	⭐	⭐	⭐	⭐	⭐	⭐
FFmpeg whipinto	💩	⭐	⭐	⭐	⭐	⭐	⭐
FFmpeg whepfrom	💩	⭐	⭐	⭐	⭐	⭐	⭐
VLC whipinto	💩	💩	⭐	⭐	⭐	⭐	💩
VLC whepfrom	💩	💩	⭐	⭐	⭐	⭐	💩
OBS Studio whip	📺 3	💩	💩	⭐	⭐	⭐	💩

• ⭐ It's working
• 💩 Don't support
• 💡 I don't know, No testing
• 📺 Note have some problem
  1. Working, But Browser can't player this video, Gstreamer to Gstreamer is working
  2. I don't know why av1 and whep error
  3. OBS av1 codec can't play

Authentication

No Authentication

DANGER

No Authentication is Default

If no set any about [auth] section in configuration file, There will no authentication

Bearer token

Static HTTP bearer token is super admin access, you should use in develop, test, debug or cluster manager

# WHIP/WHEP auth token
# Headers["Authorization"] = "Bearer {token}"
[auth]
# static JWT token, superadmin, debuggger can use this token
tokens = ["live777"]

JWT(JSON Web Token)

Use this authentication, the token include access, you can control stream, publish, subscribe...

# WHIP/WHEP auth token
# Headers["Authorization"] = "Bearer {token}"
[auth]
# JSON WEB TOKEN secret
secret = "<jwt_secret>"

Cascade

What is cascade?

Very large cluster

live777 Cascade have two mode:

• cascade-pull
• cascade-push

Static cascade-pull (WHEP source)

cascade-pull can also be declared as a static stream input instead of an API call. Build with the source-whep feature and add a whep:// source to a provisioned stream; it behaves like any other configured source (on_demand start/stop, reconnect, RTCP keyframe feedback):

[[stream.cam1.sources]]
url = "whep://edge-0:7777/whep/cam1"
# With Bearer auth:
# url = "whep://token@edge-0:7777/whep/cam1"

When this source is used with on_demand = true, live777 waits at least 35000ms for the upstream WHEP source to become ready, even if on_demand_start_timeout_ms is lower. This covers cold upstream on-demand pulls that may spend the WHEP HTTP request timeout before delivering media.

The outgoing WHEP peer gathers ICE candidates using the server's own [[ice_servers]] configuration and binds the UDP sockets from [webrtc] ice_udp_addrs (no hardcoded STUN server).

Chained on-demand pulls work one hop deep by default: this source's WHEP HTTP request waits up to 40000ms for the answer, covering an upstream that itself holds subscribes for up to 35000ms (an on-demand WHEP source). Deeper chains need their budgets aligned per deployment. Stopping this source (e.g. when the last subscriber leaves an on_demand stream) may wait out an in-flight WHEP HTTP request, bounded by that same 40000ms timeout.

Static cascade-push (WHIP target)

cascade-push can also be declared as a static stream output instead of an API call. Build with the target-whip feature and add a whip:// target to a provisioned stream:

[[stream.cam1.targets]]
url = "whip://edge-1:7777/whip/cam1"
# With Bearer auth:
# url = "whip://token@edge-1:7777/whip/cam1"

The push is media-driven: it is established when the stream gains a publisher (WHIP or a configured source) and torn down when the publisher goes away, so the downstream node sees ordinary publisher attach/detach cycles and its own auto_delete_*/on-demand strategies keep working. A configured target on an on_demand stream acts as standing demand: its sources are (re)started whenever the stream has neither a publisher nor a push session, so the relay recovers on its own once an unreachable downstream is back. A lost session (downstream close, ICE failure, provisioned-stream reset) is re-established with exponential backoff (5s doubling, 60s cap) — the same pacing bounds the on-demand source restarts, at roughly one attempt per minute.

DataChannel Forward

NOTE: About createDataChannel()

1. Live777 Don't support label, createDataChannel(label) this label is not used
2. Live777 Don't support negotiated, { id: 42, negotiated: true } this don't support

RTSP Server

Build with the rtsp feature to expose an RTSP server alongside WHIP/WHEP:

cargo build --release --bin live777 --features rtsp

Configure the listen URL in live777.toml. When credentials are present in the URL, Digest authentication is enabled automatically:

[rtsp]
# No auth:
listen = "0.0.0.0:8554"
# With Digest auth:
# listen = "rtsp://admin:secret@0.0.0.0:8554"

The same port handles both directions:

• Push media into a stream: rtsp://host:8554/{stream_id} (ANNOUNCE + RECORD)
• Pull media from a stream: rtsp://host:8554/{stream_id} (DESCRIBE + PLAY)

Both UDP and TCP (RTP/AVP/TCP) transports are supported. The first URL path segment is used as the liveion stream identifier.

Stream Hooks

Live777 can run external scripts on stream lifecycle events: stream creation/deletion, and publish start/stop (a WHIP/cascade publisher attaching, or a configured source starting/stopping). A typical use is on-demand source activation for devices live777 cannot drive directly: a hook starts a capture device / hardware encoder when media is actually wanted, and stops it when the last consumer leaves to save resources.

Built-in alternative: configured sources ([[stream.<name>.sources]]) support on_demand = true, which starts/stops the camera or RTSP pull automatically with subscriber presence — no scripts needed. See livehal — Provisioned streams and on-demand sources.

Which events signal "someone is watching"? For provisioned streams (any [stream.<name>] entry) stream-created fires once at startup, so it cannot drive power control — use publish-started / publish-stopped instead. Configured sources report their start/stop as publish events with the session id virtual-source. For dynamic streams (auto_create_whep), stream-created still coincides with first use.

# Global hooks, run for every stream.
[hooks]
timeout_ms = 5000    # per-script timeout, 0 disables
on_error = "stop"    # "stop" skips the remaining hooks of the same event;
                     # "continue" runs them anyway
on_stream_created = ["/etc/live777/hooks/notify.sh"]
on_stream_deleted = ["/etc/live777/hooks/notify.sh", "/etc/live777/hooks/cleanup.sh"]
on_publish_started = ["/etc/live777/hooks/camera-power.sh"]
on_publish_stopped = ["/etc/live777/hooks/camera-power.sh"]

# Per-stream hooks, run after the global ones.
[stream.cam1.hooks]
on_stream_created = ["/etc/live777/hooks/cam1-created.sh"]
on_stream_deleted = ["/etc/live777/hooks/cam1-deleted.sh"]
on_publish_started = ["/etc/live777/hooks/cam1-power-on.sh"]
on_publish_stopped = ["/etc/live777/hooks/cam1-power-off.sh"]

Execution guarantees:

• Hooks of one event run sequentially: global first, then per-stream, in configured order.
• Events are processed in a single FIFO queue — all hooks of an earlier event finish before any hook of a later event starts, so a stream's stream-created hooks always complete before its stream-deleted hooks begin.
• A failed script (non-zero exit, spawn error, timeout kill) is logged and handled per on_error; it never affects later events or the server.

Scripts are executed directly (no shell) and receive the event metadata both as argv and as environment variables:

argv	env	value
$1	LIVE777_EVENT	stream-created / stream-deleted / publish-started / publish-stopped
$2	LIVE777_STREAM	stream name
$3 (deleted/stopped only)	LIVE777_REASON	stream-deleted: api-deleted / publish-leave-timeout / subscribe-leave-timeout / orphaned / reset; publish-stopped: peer-closed / api-deleted / idle-timeout
—	LIVE777_SESSION	(publish events only) publisher session id; virtual-source for configured sources

Notes:

• Scripts should return quickly after initiating their work (e.g. launch an encoder in the background). A blocked script blocks the whole hook queue.
• Make scripts idempotent: a stream-deleted hook also runs when the publisher itself died (publish-leave-timeout), so stop scripts must tolerate an already-stopped device.
• For on-demand sources, combine with [strategy] auto_create_whep = true and a generous auto_delete_whep (e.g. 30000) so brief subscriber flapping does not cycle the hardware. Per-stream overrides live under [stream.<name>.strategy]. Streams configured with on_demand = true already debounce via on_demand_close_after_ms.
• No hooks fire on server shutdown (no stream-deleted events are emitted then).