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 StreamsThe definition of 'frameRate' in that specification. | Candidate Recommendation | Initial specification. |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
frameRate
|
Chrome
Full support 59 |
Edge
Full support ≤79 |
Firefox
Full support 50 |
IE
No support No |
Opera
Full support Yes |
Safari
? |
WebView Android
Full support 59 |
Chrome Android
Full support 59 |
Firefox Android
Full support 50 |
Opera Android
? |
Safari iOS
? |
Samsung Internet Android
Full support 7.0 |
Legend
- Full support
- Full support
- No support
- No support
- Compatibility unknown
- Compatibility unknown
See also
- Media Capture and Streams API
- Capabilities, constraints, and settings
MediaTrackConstraints
MediaDevices.getSupportedConstraints()
MediaTrackSupportedConstraints
MediaStreamTrack
MediaTrackConstraints.frameRate by Mozilla Contributors is licensed under CC-BY-SA 2.5.