Webcam pixel formats and Gstreamer caps filters

Up until now I have been using the standard (link) YUV 4:2:2 pixel format with my Logitech Webcam Pro 9000. This format is good for most cases; however, the framerate is limited to 15/2 fps at 1280×720 resolution, while the other supported formats (MJPG, RGB3, BGR3, YU12, YV12) support this reolution with up to 30 fps! So it was time for me to figure it out.

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