Media Recorder with Google Vision API

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Solution 1: From Android Lollipop, a MediaProjection API was introduced which in conjunction with MediaRecorder can be used to save a SurfaceView to a video file. This example shows how to output a SurfaceView to a video file.

Solution 2: Alternatively, you can use one of the neat Encoder classes provided in the Grafika repository. Note that this will require you to port the FaceTracker application so that it is using OpenGL to perform all rendering. This is because Grafika samples utilise the OpenGL pipeline for fast read and write of texture data.

There is a minimal example which achieves exactly what you want using a CircularEncoder in the ContinuousCaptureActivity class. This provides an example of Frame Blitting, simultaneously displaying frame buffer data to the screen and outputting to a video.

The major change would be to utilise a Grafika WindowSurface instead of a SurfaceView for the FaceTracker application, this sets up the EGL Context allowing you to save frame buffer data to a file via the Encoder. Once you can render everything to the WindowSurface, it is trivial to set up recording in the same way as the ContinuousCaptureActivity class.

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