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Overview

TransportParams is the base configuration class for all Pipecat transports. It controls audio input/output settings, video settings, and voice activity detection. Every transport’s params class (DailyParams, LiveKitParams, WebsocketServerParams, etc.) inherits from TransportParams. You typically pass these via the transport’s params argument: 
from pipecat.transports.daily import DailyTransport, DailyParams

transport = DailyTransport(
    room_url,
    token,
    "Bot",
    params=DailyParams(
        audio_in_enabled=True,
        audio_out_enabled=True,
        audio_out_sample_rate=24000,
        video_out_enabled=True,
        video_out_width=1280,
        video_out_height=720,
    ),
)

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Audio Output

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audio_out_enabled
bool
default:"False"
Enable audio output streaming.
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audio_out_sample_rate
int
default:"None"
Output audio sample rate in Hz. When None, uses the default rate from the TTS service.
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audio_out_channels
int
default:"1"
Number of output audio channels.
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audio_out_bitrate
int
default:"96000"
Output audio bitrate in bits per second.
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audio_out_10ms_chunks
int
default:"4"
Number of 10ms chunks to buffer before sending output audio. Higher values increase latency but reduce overhead.
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audio_out_mixer
BaseAudioMixer | Mapping[str, BaseAudioMixer]
default:"None"
Audio mixer instance for combining audio streams, or a mapping of destination names to mixer instances.
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audio_out_destinations
List[str]
default:"[]"
List of audio output destination identifiers for routing audio to specific participants or endpoints.
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audio_out_end_silence_secs
int
default:"2"
Seconds of silence to send after an EndFrame. Set to 0 to disable.

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Audio Input

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audio_in_enabled
bool
default:"False"
Enable audio input streaming.
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audio_in_sample_rate
int
default:"None"
Input audio sample rate in Hz. When None, uses the transport’s native rate.
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audio_in_channels
int
default:"1"
Number of input audio channels.
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audio_in_filter
BaseAudioFilter
default:"None"
Audio filter to apply to incoming audio (e.g., noise suppression).
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audio_in_stream_on_start
bool
default:"True"
Start audio input streaming immediately when the transport starts. Set to False to manually control when audio input begins.
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audio_in_passthrough
bool
default:"True"
Pass input audio frames downstream through the pipeline. When False, audio is consumed by VAD but not forwarded.

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Video Output

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video_out_enabled
bool
default:"False"
Enable video output streaming.
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video_out_is_live
bool
default:"False"
Enable real-time video output. When True, frames are sent as they arrive rather than buffered.
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video_out_width
int
default:"1024"
Video output width in pixels.
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video_out_height
int
default:"768"
Video output height in pixels.
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video_out_bitrate
int
default:"800000"
Video output bitrate in bits per second.
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video_out_framerate
int
default:"30"
Video output frame rate in frames per second.
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video_out_color_format
str
default:"RGB"
Video output color format string.
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video_out_codec
str
default:"None"
Preferred video codec for output (e.g., VP8, H264, H265).
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video_out_destinations
List[str]
default:"[]"
List of video output destination identifiers.

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Video Input

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video_in_enabled
bool
default:"False"
Enable video input streaming.

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Transport Subclasses

Each transport extends TransportParams with provider-specific fields:
TransportParams ClassAdditional Fields
DailyTransportDailyParamsapi_key, api_url, dialin_settings, transcription_enabled, transcription_settings
LiveKitTransportLiveKitParams(no additional fields)
SmallWebRTCTransportTransportParamsUses base class directly
WebsocketServerTransportWebsocketServerParamsadd_wav_header, serializer, session_timeout
FastAPIWebsocketTransportFastAPIWebsocketParamsserializer, session_timeout