How to capture image of Video Stream (iOS)

[Jaim Zuber]

All,

I'm trying to capture an image from a video stream on an iOS device. Has anyone done this?

I'm considering two approaches:

1. Get image data from the RTCEAGLVideoView.  

Unfortunately, the standard 

- (void)renderInContext:(CGContextRef)ctx;

doesn't render any of the video content. It only renders the background of the view.

2. Capture frame and convert it

Add an object as a Renderer

Convert the received RTCI420Frame data to RBG

Create image with CGImageCreate

Save image

My questions:

Approach 1 doesn't capture the video image. Is there a way to get it to render video data?

Does approach 2 sound reasonable? Will a single YUV frame be usable to create an RBG image?

Thanks for any advice.

Jaim

[Alvaro Gil]

Jaim Zuber, did you were able to do it?

I was trying to do the same but notice that is not possible to add a new output to the AVCaptureSession instance webrtc is using.

[Han Woz]

 approach 2 can work.On Android devices,you can capture a frame in this method:

SurfaceViewRenderer.renderFrame(VideoRenderer.I420Frame frame)

like this：http://www.webrtcbbs.com/forum.php?mod=viewthread&tid=304&page=1&extra=#pid578

If you captureToTexture,the frame's type is "oes texure",It is hard to change a image.Now I'm searching  the answer.

在 2015年11月5日星期四 UTC+8上午7:49:11，Jaim Zuber写道：

[Alvaro Gil]

Hi Jaim,

Hope this helps, is the easiest I can found, sadly not through the API.

- (UIImage *)captureFrameFromRTCView {
    UIView *view;
    for (UIView *v in _localVideoView.subviews) {
        if ([v isKindOfClass:[GLKView class]]) {
            view = v;
        }
    }

    if (!view) {
        return nil;
    } else {
        return [(GLKView *)view snapshot];
    }
}

[devil 2010]

hello, i can not found GLKView, can you help?

Vào lúc 20:32:53 UTC+7 ngày Thứ Tư, 13 tháng 4, 2016, Alvaro Gil đã viết: