case IMGFMT_IYUV: return IMGFMT_I420;
case IMGFMT_I420: case IMGFMT_IYUV: return IMGFMT_YV12;
static int remove_dup_fourcc(int fourcc){	switch(fourcc)	{	    case IMGFMT_IYUV: return IMGFMT_I420;	    case IMGFMT_Y8  : return IMGFMT_Y800;	    case IMGFMT_IF09: return IMGFMT_YVU9;	    default: return fourcc;	}}