I also see /dev/video12 and 13 which support a lot more pixel formats but I am not sure what these are for. It looks like it may be selected automatically based on output, but if I add "-pix_fmt rgba" or similar to the end of the command line, it just tells me " No accelerated colorspace conversion found from yuv420p to rgba" which looks like it's trying to convert the pixel data rather than configure the decoder to select a different pixel format. I followed your instructions and found the RGB565 output as you mentioned above, but I could not work out how to get ffmpeg to select it to see if it made any difference performance-wise. You mentioned there that /dev/video10 is the hardware decoder, and 11 is the encoder. I found your post about listing M2M devices which was very interesting.
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