Face detection not working for Front Camera

So basically, i have this code,

        if(mCamera.getParameters().getMaxNumDetectedFaces()==0)
        {
            System.out.println("Face detection not avaliable");
        }
        else
        {
            System.out.println("Max faces: " + Integer.toString(mCamera.getParameters().getMaxNumDetectedFaces()));
        }

        mCamera.setFaceDetectionListener(new FaceDetectionListener() {

            @Override
            public void onFaceDetection(Face[] faces, Camera camera) {
                // TODO Auto-generated method stub
                System.out.println("Face detection callback called." + Integer.toString(faces.length));


            }


        });

After calling mCamera.startFaceDetection();, the callback is called, everything works as normal. However, if I change cameras, the same code results in the callback never being called. The getMaxNumDetectedFaces, returns 35 for both cameras, so I assume its supported on the front camera. I can change the camera back and forth, calling this code each time, and it will work for the back camera but not the front one.

Is there anything else I might be doing wrong?