-diff -u a/libavfilter/formats.c b/libavfilter/formats.c
---- a/libavfilter/formats.c 2018-11-02 18:17:29.000000000 -0600
-+++ b/libavfilter/formats.c 2019-04-09 14:12:01.659501027 -0600
+diff -ru a/libavfilter/formats.c b/libavfilter/formats.c
+--- a/libavfilter/formats.c 2019-07-08 11:45:25.000000000 -0600
++++ b/libavfilter/formats.c 2019-08-08 18:20:27.709164671 -0600
@@ -107,11 +107,13 @@
possibly causing a lossy conversion elsewhere in the graph.
To avoid that, pretend that there are no common formats to force the