The MediaTrackSettings
dictionary's latency
property is a double-precision floating-point number indicating the estimated latency (specified in seconds) of the MediaStreamTrack
as currently configured. This lets you determine what value was selected to comply with your specified constraints for this property's value as described in the MediaTrackConstraints.latency
property you provided when calling either getUserMedia()
or MediaStreamTrack.applyConstraints()
.
This is, of course, an approximation, since latency can vary for many reasons including CPU, transmission, and storage overhead.
If needed, you can determine whether or not this constraint is supported by checking the value of MediaTrackSupportedConstraints.latency
as returned by a call to MediaDevices.getSupportedConstraints()
. However, typically this is unnecessary since browsers will ignore any constraints they're unfamiliar with.
Because RTP doesn't include this information, tracks associated with a WebRTC RTCPeerConnection
will never include this property.