vf_yadif: fix missing error handling for avfilter_poll_frame()

diff --git a/libavfilter/vf_yadif.c b/libavfilter/vf_yadif.c
index 12b37836f8d0d87a724864ffa70336ad9441a55c..790dda5a0b5903841584c97ad9f23acaafdb48f9 100644 (file)
--- a/libavfilter/vf_yadif.c
+++ b/libavfilter/vf_yadif.c
@@ -316,11 +316,15 @@ static int poll_frame(AVFilterLink *link)
         return 1;
 
     val = avfilter_poll_frame(link->src->inputs[0]);
+    if (val <= 0)
+        return val;
 
     if (val==1 && !yadif->next) { //FIXME change API to not requre this red tape
         if ((ret = avfilter_request_frame(link->src->inputs[0])) < 0)
             return ret;
         val = avfilter_poll_frame(link->src->inputs[0]);
+        if (val <= 0)
+            return val;
     }
     assert(yadif->next || !val);