The MediaTrackConstraints
dictionary's frameRate
property is a ConstrainDouble
describing the requested or mandatory constraints placed upon the value of the frameRate
constrainable property.
If needed, you can determine whether or not this constraint is supported by checking the value of MediaTrackSupportedConstraints.frameRate
as returned by a call to MediaDevices.getSupportedConstraints()
. However, typically this is unnecessary since browsers will simply ignore any constraints they're unfamiliar with.
Syntax
var constraintsObject = { frameRate: constraint }; constraintsObject.frameRate = constraint;
Value
A 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 ConstrainDouble
will guide the user agent in its efforts to provide an exact match to the required frame rate (if exact
is specified or both min
and max
are provided and have the same value) or to a best-possible value.
Example
See "Example: Constraint exerciser" in Capabilities, constraints, and settings for an example.
Specifications
Specification | Status | Comment |
---|---|---|
Media Capture and Streams The definition of 'frameRate' in that specification. |
Editor's Draft | Initial specification. |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Microsoft Edge | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|---|
Basic support | (Yes) | 50 (50) | ? | No support | (Yes) | ? |
Feature | Android | Android Webview | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile | Chrome for Android |
---|---|---|---|---|---|---|---|
Basic support | ? | (Yes) | 50.0 (50) | No support | ? | ? | (Yes) |