Composer Reference Guide R3-2026-2.7.9774.35170-prerelease

SRT input 16 channel audio

SRT Input.

Property Type Access Description
ShowAdvancedOptions bool get/set Show advanced options
SrtInputConfigurationTemplate SrtInputConfigurationTemplate get/set Select a template
ListenerAddress string get/set Remote server address
AutoStart bool get/set Start listener when loaded
AutoRestart bool get/set Restart listener on timeouts and errors
WarnOnBufferUnderRun bool get/set Warn when buffer under run occurs (Video or audio buffer length reaches zero)
ReconnectInterval ReconnectInterval get/set How long to wait before trying a failed or dropped connection again. [default=5 seconds]. Applies when a connection is refused, fails, or drops after it was established. It does NOT apply to a listener waiting for its first connection: an input in mode=listener is waiting to be connected TO, and goes on waiting for as long as the project runs, whatever this is set to. (Never) leaves the input down after a failure until it is connected by hand, the same as turning Restart on timeouts and errors off — either switch stops a caller after its first failed attempt, and neither one ends a listener's wait.
SrtBufferLength SrtBufferLength get/set Buffer length (ms).
Synchronize bool get/set Synchronize this SRT input with other synchronized SRT inputs. [default=false]. Off by default. When enabled, this input joins the shared studio sync group so genlocked cameras arriving with different network latency are presented frame-aligned on the same output frame. Deepens the receive buffer (see Max sync buffer (ms)), adding latency equal to the slowest stream.
MinSyncBufferMs int get/set Minimum receive buffer kept while synchronizing, in milliseconds. [min=100, max=2000, default=250].
MaxSyncBufferMs int get/set Maximum receive buffer used while synchronizing, in milliseconds. [min=250, max=3000, default=1500]. The largest inter-stream latency spread the group can absorb; exceeding it raises a warning and prevents lock.
SyncLockState SrtSyncLockState get Live synchronization state of this input relative to the studio group (read-only).
SyncOffsetMs double get How far this input is running ahead of / behind the group target, in milliseconds (read-only).
SyncBufferUsedMs int get How much hold-back buffer this input is currently using, in milliseconds (read-only).
SyncBufferUsedFrames int get How many video frames this input is currently holding back for synchronization (read-only).
SyncBufferTargetMs int get The target buffer depth this input is buffering toward while synchronizing, in milliseconds (read-only).
SyncBufferUsedVramMb double get Estimated GPU memory the synchronization hold-back buffer is currently using, in megabytes (read-only). Approximated from the buffered frame count and the video resolution (~1.5 bytes/pixel for the NV12 decoder output).
UseHardwareDecoding bool get/set Use hardware decoding (nvdec).
HardwareDecodingUsed string get Hardware decoding active
UseSecondaryAudio bool get/set Use secondary audio (channels 5-8)
FreezeFrameOptions FreezeFrameOptions get/set Freeze frame handling when connection is lost
StartListenerCommand Command get Start Srt listener
StopListenerCommand Command get Stop Srt listener
SrtInputStreamState SrtInputStreamState get SRT Input State
ListenerStatus ListenerStatus get Current state of listener (listener/caller)
ComponentLog ComponentLog get Multiline component log
VideoCodecName string get Friendly name of the incoming video codec (e.g. "hevc", "h264"), taken from the negotiated stream (read-only). Empty until the source has been negotiated.
NumConnectAttempts long get Total number of connection attempts made since the input was started, failed ones included (read-only). A number that climbs while the input never reaches Started means the endpoint is refusing or unreachable. libsrt reports its handshake rejections on stderr, which on Linux reaches journald and never the Composer log, so this is the Composer-side evidence that a connection is being attempted and refused.
NumAutoReconnectsPerformed int get Automatic reconnects performed
SrtBufferingState NetworkBufferingState get Current buffering state
NumPacketsReceived long get Number of packets received
RenderedFramesCounter int get # Rendered Frames Counter
IncomingVideoBitRate string get Incoming video bitrate
VideoAudioSync double get Audio video sync (ms)
VideoBufferSizeFrames int get Video buffer size (frames)
VideoBufferSizeMs int get Video buffer size (ms)
AudioBufferSizeMs int get Audio buffer size (ms)
NumBufferUnderRuns int get Number of buffer under-runs (any stream)
NumFlushIterations long get Number of buffer flushes performed
NumVideoDecodeErrors int get Number of video decode errors
NumPtsSyncFlushIterations string get Number of sync flushes performed
NumSyncRetries int get Number of pts sync retries
BufferSizes Dictionary<string, object> get Streams buffer sizes (ms)
NumFlushesPerformed int get Number of flushes performed
StreamTime TimeCode get Stream time
CapturedTimeCode TimeCode get SMPTE timecode embedded in the incoming stream, read back frame-by-frame (read-only). This is the source's own timecode — unlike StreamTime, which counts elapsed time since this connection went live. Null when the stream carries no embedded timecode. In-stream SEI/S12M timecode is typically only present on HEVC (software-decode) sources, but SMPTE ST 2038 ancillary timecode is read codec-agnostically, so H.264 sources that carry it also report a timecode. Named to match the Blackmagic input's captured timecode for cross-input consistency.
VideoStreamInfo Dictionary<string, object> get Video stream info
AudioStreamInfo Dictionary<string, object> get Audio stream info

Inherits from: AbstractInput, AbstractAudioProcessing, AbstractAudioMetering, NamedModel.

See also: SRT input 16 channel audio in Inputs — user-facing introduction, screenshots, and section summaries.