From d790f18ac0c3ef82459ebb526039d42b1ea73bc2 Mon Sep 17 00:00:00 2001
From: Nicolas George <george@nsup.org>
Date: Mon, 19 Jun 2017 10:28:41 +0200
Subject: [PATCH] lavfi: print the error message when threading init fails.

---
 libavfilter/avfiltergraph.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavfilter/avfiltergraph.c b/libavfilter/avfiltergraph.c
index 598e50a077..4304c06847 100644
--- a/libavfilter/avfiltergraph.c
+++ b/libavfilter/avfiltergraph.c
@@ -193,7 +193,7 @@ AVFilterContext *avfilter_graph_alloc_filter(AVFilterGraph *graph,
         } else {
             int ret = ff_graph_thread_init(graph);
             if (ret < 0) {
-                av_log(graph, AV_LOG_ERROR, "Error initializing threading.\n");
+                av_log(graph, AV_LOG_ERROR, "Error initializing threading: %s.\n", av_err2str(ret));
                 return NULL;
             }
         }