Xamarin.Essentials Screenshot.CaptureAsync() not working for video view

Question

Xamarin.Essentials Screenshot.CaptureAsync() not working for video view

Torit Schneider 1

I use this function to capture my video screen:

var screenshot = await Screenshot.CaptureAsync();

But the image created is not updated,
The view changes at runtime, and the image created is the initial image of the view.

How can I fix it?

Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 36,436 Reputation points Microsoft External Staff

2021-12-10T06:18:05.543+00:00
I check the source code in Xamarin.Essentials, it uses UIScreen.MainScreen.Capture() to get the image in iOS. But when I check the API, I see the below message :

// Remarks: // This API will only capture UIKit and Quartz drawing, because it uses the screen's // CALayer's RenderInContext method to perform the screenshot. It will not capture // OpenGL ES or video content. // If you want to capture an OpenGL ES or video content use the OpenTK.Platform.iPhoneOS.iPhoneOSGameView.Capture // method. public UIImage Capture();

So, we couldn't capture the video screen by this method. I'm not clear about your video player and the view ,would you mind sharing more information? You could also try to use iPhoneOSGameView.Capture in iOS.
Torit Schneider 1 Reputation point

2021-12-20T09:53:51.983+00:00

This is a video call view that I try to make a screen capture of the other user's video during the call,
The solution you gave is suitable for iOS, do you know a solution for Android as well?
Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 36,436 Reputation points Microsoft External Staff

2021-12-21T07:57:56.64+00:00

There is a sample of how to use Media Projection API to capture device screen, you could refer to https://learn.microsoft.com/en-us/samples/xamarin/monodroid-samples/android50-screencapture You could also create a new thread for Android.
Torit Schneider 1 Reputation point

2021-12-22T10:06:32.087+00:00

But how do I implement this in xamarin forms?
Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 36,436 Reputation points Microsoft External Staff

2022-01-05T07:07:15.667+00:00

You could try using custom renderers to implement and access native APIs.

Your answer

Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 36,436 Reputation points Microsoft External Staff

2021-12-10T06:18:05.543+00:00

I check the source code in Xamarin.Essentials, it uses UIScreen.MainScreen.Capture() to get the image in iOS. But when I check the API, I see the below message :

// Remarks: // This API will only capture UIKit and Quartz drawing, because it uses the screen's // CALayer's RenderInContext method to perform the screenshot. It will not capture // OpenGL ES or video content. // If you want to capture an OpenGL ES or video content use the OpenTK.Platform.iPhoneOS.iPhoneOSGameView.Capture // method. public UIImage Capture();

So, we couldn't capture the video screen by this method. I'm not clear about your video player and the view ,would you mind sharing more information? You could also try to use iPhoneOSGameView.Capture in iOS.
Torit Schneider 1 Reputation point

2021-12-20T09:53:51.983+00:00

This is a video call view that I try to make a screen capture of the other user's video during the call,
The solution you gave is suitable for iOS, do you know a solution for Android as well?
Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 36,436 Reputation points Microsoft External Staff

2021-12-21T07:57:56.64+00:00

There is a sample of how to use Media Projection API to capture device screen, you could refer to https://learn.microsoft.com/en-us/samples/xamarin/monodroid-samples/android50-screencapture You could also create a new thread for Android.
Torit Schneider 1 Reputation point

2021-12-22T10:06:32.087+00:00

But how do I implement this in xamarin forms?
Wenyan Zhang (Shanghai Wicresoft Co,.Ltd.) 36,436 Reputation points Microsoft External Staff

2022-01-05T07:07:15.667+00:00

You could try using custom renderers to implement and access native APIs.

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Xamarin.Essentials Screenshot.CaptureAsync() not working for video view

Your answer