Incorrect FourCC code for YUY2 format while recording from UVC camera

While recording from standard UVC camera to file VLC player writes 'yuy2' instead of 'YUY2'. \ That leads to fail opening this file by any programs including VLC player itself. Corresponding forum thread: https://forum.videolan.org/viewtopic.php?f=14&t=152042&p=499486#p499486

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