---
 avconv.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/avconv.c b/avconv.c
index 27dabc0..a1884ad 100644
--- a/avconv.c
+++ b/avconv.c
@@ -547,7 +547,7 @@ static FilterGraph *init_simple_filtergraph(InputStream 
*ist, OutputStream *ost)
 
 static void init_input_filter(FilterGraph *fg, AVFilterInOut *in)
 {
-    InputStream *ist;
+    InputStream *ist = NULL;
     enum AVMediaType type = avfilter_pad_get_type(in->filter_ctx->input_pads, 
in->pad_idx);
     int i;
 
@@ -599,6 +599,8 @@ static void init_input_filter(FilterGraph *fg, 
AVFilterInOut *in)
             exit_program(1);
         }
     }
+    av_assert0(ist);
+
     ist->discard         = 0;
     ist->decoding_needed = 1;
     ist->st->discard = AVDISCARD_NONE;
-- 
1.7.10

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