Merge remote-tracking branch 'cigaes/master'

* cigaes/master:
  lavfi/buffersrc: fix failed requests count.

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

libavfilter/buffersrc.c

@@ -123,6 +123,8 @@ static int attribute_align_arg av_buffersrc_add_frame_internal(AVFilterContext *
     AVFrame *copy;
     int ret;
 
+    s->nb_failed_requests = 0;
+
     if (!frame) {
         s->eof = 1;
         return 0;