X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavfilter%2Fvf_fieldhint.c;h=2b845e7330583dc873475ab567fc18ce59fd74da;hb=7a2b9dd060b6f057758a1ac7820b66d6c1ad1e49;hp=bdba77f90b4bcf1146fb2d3781e2f47d849ea114;hpb=a454ad670c770902f739012ff9ed4178bd9e6feb;p=ffmpeg

diff --git a/libavfilter/vf_fieldhint.c b/libavfilter/vf_fieldhint.c
index bdba77f90b4..2b845e73305 100644
--- a/libavfilter/vf_fieldhint.c
+++ b/libavfilter/vf_fieldhint.c
@@ -18,6 +18,7 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include "libavutil/avassert.h"
 #include "libavutil/imgutils.h"
 #include "libavutil/internal.h"
 #include "libavutil/opt.h"
@@ -173,13 +174,15 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
 
     switch (s->mode) {
     case 0:
-        top    = s->frame[1 + tf - outlink->frame_count];
-        bottom = s->frame[1 + bf - outlink->frame_count];
+        top    = s->frame[tf - outlink->frame_count + 1];
+        bottom = s->frame[bf - outlink->frame_count + 1];
         break;
     case 1:
         top    = s->frame[1 + tf];
         bottom = s->frame[1 + bf];
         break;
+    default:
+        av_assert0(0);
     }
 
     switch (hint) {