This shows that media session samples are correctly oriented, but that mfmediaengine renders them upside down.
-- v2: mfmediaengine: Remove vertical flipping of video frames. mfmediaengine/tests: Check IMFMediaEngine_TransferVideoFrames output orientation. mfmediaengine/tests: Pass a device and output format to create_media_engine. mf: Avoid clearing media session command list while it is running. mf/tests: Check sample grabber RGB / NV12 orientation. mf/tests: Factor test grabber callback implementations.