@@ -28,7 +28,7 @@

 #define LIBAVFILTER_VERSION_MAJOR  1

 #define LIBAVFILTER_VERSION_MINOR 73

-#define LIBAVFILTER_VERSION_MICRO  0

+#define LIBAVFILTER_VERSION_MICRO  1

 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

                                                LIBAVFILTER_VERSION_MINOR, \

@@ -34,6 +34,8 @@ AVFilterGraph *avfilter_graph_alloc(void)

 void avfilter_graph_free(AVFilterGraph *graph)

 {

+    if (!graph)

+        return;

     for (; graph->filter_count > 0; graph->filter_count --)

         avfilter_free(graph->filters[graph->filter_count - 1]);

     av_freep(&graph->scale_sws_opts);

@@ -79,7 +79,7 @@ int avfilter_graph_create_filter(AVFilterContext **filt_ctx, AVFilter *filt,

 int avfilter_graph_config(AVFilterGraph *graphctx, AVClass *log_ctx);

 /**

- * Free a graph and destroy its links.

+ * Free a graph and destroy its links, graph may be NULL.

  */

 void avfilter_graph_free(AVFilterGraph *graph);