If needed, you can determine whether or not this constraint is supported by checking
the value of
MediaTrackSupportedConstraints.frameRate as returned by a
MediaDevices.getSupportedConstraints(). However, typically this
is unnecessary since browsers will ignore any constraints they're unfamiliar with.
ConstrainDouble describing the acceptable or required value(s) for a
video track's frame rate, in frames per second.
If this value is a number, the user agent will attempt to obtain media whose frame rate
is as close as possible to this number given the capabilities of the hardware and the
other constraints specified. Otherwise, the value of this
will guide the user agent in its efforts to provide an exact match to the required frame
exact is specified or both
are provided and have the same value) or to a best-possible value.
See the Constraint exerciser example.
|Media Capture and Streams |
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