lavf/vividas: Do not increase extradata_size after allocation.

Avoids a crash in avcodec_parameters_from_context().

diff --git a/libavformat/vividas.c b/libavformat/vividas.c
index e199b05d69899ef284de1c73ab96a06d1891663f..00a1a0f6efad9203d524821f7666eba2fcd7ac6d 100644 (file)
--- a/libavformat/vividas.c
+++ b/libavformat/vividas.c
@@ -392,7 +392,8 @@ static void track_header(VividasDemuxContext *viv, AVFormatContext *s,  uint8_t
                 offset += data_len[j];
             }
 
-            st->codecpar->extradata_size = offset;
+            if (offset < st->codecpar->extradata_size)
+                st->codecpar->extradata_size = offset;
         }
     }