AES67 Target

AES67 Target properties for Script Engine. Streams the scene audio as uncompressed PCM (L24 or L16, 48 kHz) over RTP multicast, the open AES67 Audio-over-IP standard. Use it for professional, low-latency, high-quality audio monitoring and contribution outside Composer Desktop — including on the headless Linux runtime — to receivers such as ffplay, VLC, software AES67/RAVENNA sound cards, and Dante networks (which interoperate with AES67). The session is described by an SDP that is written to a file, shown in the panel, and announced via SAP for auto-discovery. Note: this version derives RTP timing from the engine audio clock and is not yet PTP-locked, so a single stream plays everywhere but multiple AES67 sources cannot be sample-accurately cross-locked.

Property	Type	Access	Description
`ShowAdvancedOptions`	`bool`	`get/set`	Reveals advanced/expert properties in the panel. Off by default — flip to On to see fields like TTL, payload type, SDP file path and the extra channel pairs.
`AutoStart`	`bool`	`get/set`	When On, the AES67 target connects automatically when the project loads. Useful for unattended studio machines or automation rigs.
`MulticastAddress`	`string`	`get/set`	The IPv4 multicast group the RTP audio is sent to (224.0.0.0–239.255.255.255). AES67 deployments commonly use the 239.x range. Can only be changed before the target starts.
`Port`	`int`	`get/set`	UDP port for the RTP stream (default 5004, the AES67 convention).
`Ttl`	`int`	`get/set`	Multicast time-to-live (hop limit). 1 keeps traffic on the local subnet; raise it to cross routers. Also used for SAP announcements.
`PayloadType`	`int`	`get/set`	RTP dynamic payload type (96–127, default 96). Only change if a receiver requires a specific value.
`BitDepth`	`Aes67BitDepth`	`get/set`	PCM bit depth on the wire. L24 (default) is the AES67-preferred 24-bit payload; L16 is offered for receivers that handle 16-bit more reliably (e.g. VLC).
`SessionName`	`string`	`get/set`	Session name advertised in the SDP and via SAP. Shown by receivers when they discover the stream.
`SdpFilePath`	`string`	`get/set`	Path the generated .sdp file is written to. Leave empty to write a default file in the system temp folder. Point ffplay/VLC at this file to play the stream.
`AnnounceViaSap`	`bool`	`get/set`	When On, announce the session via SAP (RFC 2974) so SAP-aware receivers auto-discover it. The .sdp file is written regardless.
`AudioPairOneEnabled`	`bool`	`get/set`	Include audio pair 1 in the stream.
`AudioPairOneMapping`	`AudioChannelMapping`	`get/set`	Scene audio channel pair routed to AES67 pair 1.
`AudioPairTwoEnabled`	`bool`	`get/set`	Include audio pair 2 in the stream.
`AudioPairTwoMapping`	`AudioChannelMapping`	`get/set`	Scene audio channel pair routed to AES67 pair 2.
`AudioPairThreeEnabled`	`bool`	`get/set`	Include audio pair 3 in the stream.
`AudioPairThreeMapping`	`AudioChannelMapping`	`get/set`	Scene audio channel pair routed to AES67 pair 3.
`AudioPairFourEnabled`	`bool`	`get/set`	Include audio pair 4 in the stream.
`AudioPairFourMapping`	`AudioChannelMapping`	`get/set`	Scene audio channel pair routed to AES67 pair 4.
`ConnectionStatus`	`ConnectionStatus`	`get`	Current connection status (Disconnected, Connecting, Connected). Read-only.
`StartCommand`	`Command`	`get`	Begins streaming the audio over multicast and announcing the session.
`StopCommand`	`Command`	`get`	Stops the stream and removes the session announcement.
`StartedDateTime`	`DateTime`	`get`	Timestamp of when the target last started streaming (read-only).
`ChannelCount`	`int`	`get`	Number of audio channels currently being sent (read-only).
`SentPackets`	`int`	`get`	Total RTP packets sent since the target started (read-only, debug).
`PacketRate`	`string`	`get`	Current packet send rate (read-only). At ptime 1 ms this should sit near 1000 packets/sec when streaming.
`OutputBitrate`	`string`	`get`	Approximate output audio bitrate (read-only). For L24 stereo this is ~2.3 Mbps; scales with channel count and bit depth. A quick sanity check that the channel/bit-depth config matches what you expect.
`SendQueueDepth`	`int`	`get`	Number of audio frames waiting to be sent (read-only). Should hover near zero; a steadily growing value means the sender is falling behind the render loop.
`PacingCatchups`	`int`	`get`	Count of packets sent in catch-up mode because a render frame arrived late (read-only, debug). Steadily climbing indicates pacing bursts — the usual cause of receiver "jitter buffer full" glitches.
`SilentInputFrames`	`int`	`get`	Count of render frames that carried no audio (read-only, debug). A non-zero value points to an engine-side audio gap rather than a network problem.
`Ssrc`	`string`	`get`	RTP SSRC of the current session in hex (read-only). Match this against a receiver's view to confirm it is locked onto this exact stream.
`SdpText`	`MultilineText`	`get`	The generated SDP session description (read-only). Save this to a .sdp file or hand it to a receiver to play the stream.

Inherits from: AbstractTarget, NamedModel.

See also: AES67 Target in Targets — user-facing introduction, screenshots, and section summaries.