Adobe AIR camera slow

I am having issues with using the camera on Adobe AIR mobile devices.

The performance of the camera is ok on newer phones, but on galaxy s2 for example it is impossible to use. I am using the camera like this:

 _camera = Camera.getCamera("0");
    if (_camera != null)
    {

//      _video = new Video();
        _video = new Video(_camera.width, _camera.height);
//      _video.width = _cameraHeight;
        _video.width = _cameraHeight;
        _video.height = Starling.current.nativeStage.fullScreenWidth;
        _camera.addEventListener(ActivityEvent.ACTIVITY, onCameraActivity);
        _camera.setMode( _video.width,_video.height, 30 );
        _video.attachCamera(_camera);
        _videoContainer.addChild(_video);
    }

Does anyone have any recommendations?

EDIT: The problem is that the framerate drops to around 1 on Galaxy S2 and the app crashes. On my galaxy S3 it works around 30fps. I also tried uploading the video to the GPU on every frame using

flash.display3D.textures.Texture(image.texture.base).uploadFromBitmapData(bmd);

it gets better on my galaxy s3 then, fps is around 50-60, but on galaxy s2 still terrible and unusable(around 1 fps)

If you are actually using Starling, this is what I've used before (project about half an year old, don't know if things changed that much):

camera = Camera.getCamera();
camera.setLoopback(false);
camera.setMode(640, 640, 15);
var cropping:Rectangle = new Rectangle(0, 0, getLowerPowerOfTwo(camera.width), getLowerPowerOfTwo(camera.height));
webcamVideo = new WebcamVideo(  camera, 
                                new Rectangle(
                                    (camera.width - cropping.width) * .5,
                                    (camera.height - cropping.height) * .5,
                                    cropping.width,
                                    cropping.height),
                                false,
                                 WebcamVideo.DRAW_BITMAPDATA|WebcamVideo.UPLOAD_FROM_BITMAPDATA);

The frame rate is set to 15, but if you try you can see that the result is not that bad. And I've set it to 15, because of the fact that I was testing on an old HTC Sensation (3 years old), S2 and another one old that I forgot. You can check the hardware and boost up if needed. On HTC One it works like a charm at 30.

Give it a try, I hope it helps! :)