ffplay - specify a input pixel format from UVC cam (via V4L2)

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I develop a UVC device that can stream the video but its output format is RGB565, and UVC is not supported RGB.
So, I declare my output is YUV422 (also 16 bit per pixel), now I can see my image but its color is incorrect (of course..).

Is it possible to use any tool (ffplay/vlc/mplayer/etc..) to force the input pixel format without to reference v4l2 device capability? Thanks everyone.

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