{"json_modified": "2016-10-19T18:56:02.266957", "uuid": "0678d33a-575c-4c78-ac73-7789c29cd0a8", "title": "MediaTrackConstraints.aspectRatio", "url": "/en-US/docs/Web/API/MediaTrackConstraints/aspectRatio", "tags": ["aspectRatio", "API", "MediaTrackConstraints", "WebRTC", "Reference", "Constraints", "Property", "Media Streams API", "getusermedia", "Media Capture and Streams API", "Media"], "translations": [], "modified": "2016-10-19T18:56:02", "label": "MediaTrackConstraints.aspectRatio", "localization_tags": [], "locale": "en-US", "id": 196755, "last_edit": "2016-10-19T10:13:15", "summary": "The <a href=\"/en-US/docs/Web/API/MediaTrackConstraints\" title=\"The MediaTrackConstraints dictionary is used to describe a set of capabilities and the value or values each can take on. A constraints dictionary is passed into applyConstraints() to allow a script to establish a set of exact (required) values or ranges and/or preferred values or ranges of values for the track, and the most recently-requested set of custom constraints can be retrieved by calling getConstraints().\"><code>MediaTrackConstraints</code></a> dictionary's <code><strong>aspectRatio</strong></code> property is a <a href=\"/en-US/docs/Web/API/ConstrainDouble\" title=\"The ConstrainDouble type is used to specify a constraint for a property whose value is a double-precision floating-point number. It extends the DoubleRange dictionary (which provides the ability to specify a permitted range of property values) to also support an exact value and/or an ideal value the property should take on. Additionally, you can specify the property's value as a simple floating-point value, in which case the user agent does its best to match the value once all other more stringent constraints are met.\"><code>ConstrainDouble</code></a> describing the requested or mandatory constraints placed upon the value of the <a href=\"/en-US/docs/Web/API/MediaTrackSettings/aspectRatio\" title=\"The MediaTrackSettings dictionary's aspectRatio property is a double-precision floating-point number indicating the aspect ratio 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.aspectRatio property you provided when calling either getUserMedia() or MediaStreamTrack.applyConstraints().\"><code>aspectRatio</code></a> constrainable property.", "sections": [{"id": "Quick_Links", "title": null}, {"id": "Syntax", "title": "Syntax"}, {"id": "Value", "title": "Value"}, {"id": "Example", "title": "Example"}, {"id": "Specifications", "title": "Specifications"}, {"id": "Browser_compatibility", "title": "Browser compatibility"}, {"id": "See_also", "title": "See also"}], "slug": "Web/API/MediaTrackConstraints/aspectRatio", "review_tags": []}