avfilter/vf_fspp: Add GBRP and gray8 support

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavfilter/vf_fspp.c

@@ -509,6 +509,7 @@ static int query_formats(AVFilterContext *ctx)
         AV_PIX_FMT_YUV410P,  AV_PIX_FMT_YUV440P,
         AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ422P,
         AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ440P,
+        AV_PIX_FMT_GBRP, AV_PIX_FMT_GRAY8,
         AV_PIX_FMT_NONE
     };
     ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));