Use ImageReader surface for video stream without Camera2 API

Question

I'm trying to get the video stream of a camera into an imagereader surface to be able to process these images. I found a lot of examples that deal with the camera2 API but I don't use that because my video stream comes from an external camera.

Ideally, I would have two surfaces: one as a preview and and one from the ImageReader to process the image. Similar to this. I understand that you combine the two surfaces with a CaptureRequest.Builder and then .addTarget(surface). The problem is that I don't have a CamerDevice to make the createCaptureRequest.

The code I am using can be found here.

I tried to just create an ImageReader and its surface and pass it to the startDecoding function. But this didn't work quite well as I got this error:

E/JNI: close+++++++
E/BufferQueueProducer: [ImageReader-1280x720f32315659m16-17834-0] dequeueBuffer: BufferQueue has been abandoned
E/ACodec: NATIVE_WINDOW_MIN_UNDEQUEUED_BUFFERS query failed: No such device (19)
E/ACodec: Failed to allocate output port buffers after port reconfiguration: (-19)
E/ACodec: signalError(omxError 0x80001001, internalError -19)
E/MediaCodec: Codec reported err 0xffffffed, actionCode 0, while in state 6
E/AccessHeadCameraActivity: Error has occured.
                            java.lang.IllegalStateException
                            at android.media.MediaCodec.native_dequeueOutputBuffer(Native Method)
                            at android.media.MediaCodec.dequeueOutputBuffer(MediaCodec.java:2379)

Any hint into the right direction would be nice!

Update 1:

The error results from the return value of dequeueOutputBuffer, as this has the value of -1. According to the docs on the MediaCodec, this means that the call timed out. But why does that happen?

Update 2

I don't have the surfaceCreated (because I don't have the SurfaceView anymore), so that code moved into the onCreate. Everthing else is pretty much the same as in here

@Override
public void onCreate(Bundle savedInstanceState) {

    getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_acess_headcamera);
    mediaManager = (MediaManager) getUnitManager(FuncConstant.MEDIA_MANAGER);

    setupImageReader();

    StreamOption streamOption = new StreamOption();
    streamOption.setChannel(StreamOption.MAIN_STREAM);
    streamOption.setDecodType(StreamOption.HARDWARE_DECODE);
    streamOption.setJustIframe(false);
    mediaManager.openStream(streamOption);

    surface = imageReader.getSurface();
    startDecoding(surface);

    initListener();
}

private void setupImageReader() {
    imageReader = ImageReader.newInstance(width, height, ImageFormat.YV12,
            IMAGE_READER_BUFFER_SIZE);
    imageReader.setOnImageAvailableListener(onImageAvailableListener, backgroundHandler);
}