static int query_format(struct vf_instance *vf, unsigned int fmt) { /* FIXME - really any YUV 4:2:0 input format should work */ switch (fmt) { case IMGFMT_YV12: case IMGFMT_IYUV: case IMGFMT_I420: return ff_vf_next_query_format(vf, IMGFMT_YV12); } return 0; }