Restore a check added in 440af105f2306d3c7b3b3f4d7530bab910d49cb9
but lost sometime after. avfilter_graph_set_auto_convert() will
have an effect once again.

Signed-off-by: Burt P <pbu...@gmail.com>
---
 libavfilter/avfiltergraph.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/libavfilter/avfiltergraph.c b/libavfilter/avfiltergraph.c
index 4275113..3af698d 100644
--- a/libavfilter/avfiltergraph.c
+++ b/libavfilter/avfiltergraph.c
@@ -507,6 +507,14 @@ static int query_formats(AVFilterGraph *graph, AVClass 
*log_ctx)
                 char scale_args[256];
                 char inst_name[30];
 
+                if (graph->disable_auto_convert) {
+                    av_log(log_ctx, AV_LOG_ERROR,
+                           "The filters '%s' and '%s' do not have a common 
format "
+                           "and automatic conversion is disabled.\n",
+                           link->src->name, link->dst->name);
+                    return AVERROR(EINVAL);
+                }
+
                 /* couldn't merge format lists. auto-insert conversion filter 
*/
                 switch (link->type) {
                 case AVMEDIA_TYPE_VIDEO:
-- 
2.7.4

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