I was playing with porting of code of aio-grab for prismcube (ArmV7)
it seems that there the grab of osd can work
but i cannot find a solution about the grab of the video because of lack of informations about registeroffset, chr_luma_stride, chr_luma_register_offset, mem2memdma_register.
Please let me know if someone have any idea or suggestion about how to retrieve these informations or to try alternative methods (/dev/video is not available too).