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Specify Video Constraints for iOS v2.x


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Warning

This page is for reference only. We are no longer onboarding new customers to Programmable Video. Existing customers can continue to use the product until December 5, 2024(link takes you to an external page).
We recommend migrating your application to the API provided by our preferred video partner, Zoom. We've prepared this migration guide(link takes you to an external page) to assist you in minimizing any service disruption.

You can customize the properties of the video produced by a TVIVideoCapturer using TVIVideoConstraints. Constraints allow you to choose at runtime between one of the many TVIVideoFormats that are supported by the capturer. The included TVICameraCapturer class exposes formats based upon what your device's cameras are capable of.

Constraints allow you to filter by several criteria including size, frame rate, and aspect ratio. While constraints are used to resolve the actual capture format, the video sent to other Participants may be downscaled (temporally or spatially) in response to network and device conditions.

In Swift


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// Create camera object
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let camera = TVICameraCapturer(source: .frontCamera)
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// Setup the video constraints
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let videoConstraints = TVIVideoConstraints { (constraints) in
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constraints.maxSize = TVIVideoConstraintsSize960x540
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constraints.minSize = TVIVideoConstraintsSize960x540
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constraints.maxFrameRate = TVIVideoConstraintsFrameRateNone
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constraints.minFrameRate = TVIVideoConstraintsFrameRateNone
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}
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// Add local video track with camera and video constraints
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localVideoTrack = TVILocalVideoTrack(capturer: capturer,
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enabled: true,
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constraints: videoConstraints,
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name: "Screen")
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// If the constraints are not satisfied, a nil track will be returned.
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if (localVideoTrack == nil) {
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print ("Error: Failed to create a video track using the local camera.")
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}

In Objective-C


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// Create camera object
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TVICameraCapturer *camera = = [[TVICameraCapturer alloc] init];
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// Setup the video constraints
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TVIVideoConstraints *videoConstraints = [TVIVideoConstraints constraintsWithBlock:
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^(TVIVideoConstraintsBuilder * _Nonnull builder) {
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builder.maxSize = TVIVideoConstraintsSize960x540;
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builder.minSize = TVIVideoConstraintsSize960x540;
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builder.maxFrameRate = TVIVideoConstraintsFrameRateNone;
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builder.minFrameRate = TVIVideoConstraintsFrameRateNone;
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}];
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// Add local video track with camera and video constraints
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TVIVideoTrack *localVideoTrack = [TVILocalVideoTrack trackWithCapturer:camera
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enabled:YES
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constraints:videoConstraints
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name:@"Camera"];
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// If the constraints are not satisfied, a nil track will be returned.
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if (localVideoTrack == nil) {
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NSLog(@"Error: Failed to create a video track using the local camera.");
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}


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