Select filter

select limits which tracks or participants flow through a component.

Where it appears

Component	Location
RTC sources (livekit, jitsi, daily, agora)	Inside config.select
Nodes and sinks	Top-level select field (sibling of name, type, inputs)

Fields

Field	Type	Description
mediaType	string	video, audio, both (default), or caption where supported
identities	string[]	Include only these participant identities
excludeIdentities	string[]	Exclude these identities
trackSources	string[]	e.g. camera, microphone, screen_share
trackNames	string[]	Include tracks with these names
trackSids	string[]	Include tracks with these SIDs

RTC source example

select lives inside the source config:

{
  "name": "room_src",
  "type": "livekit",
  "config": {
    "serverUrl": "wss://your-project.livekit.cloud",
    "token": "eyJ...",
    "select": {
      "mediaType": "both",
      "identities": ["host"],
      "trackSources": ["camera", "microphone"]
    }
  }
}

Node / sink example

select is a top-level field on the component:

{
  "name": "mix_video",
  "type": "video_mixer",
  "inputs": ["room_src"],
  "select": {
    "mediaType": "video",
    "identities": ["presenter"]
  },
  "config": { }
}

Notes

• On RTC sources, select controls network subscription — fewer tracks means less bandwidth.
• On nodes and sinks, select controls processing — different downstream views from the same source.
• Omitted fields mean no filter for that dimension.