diff --git a/ext/ffmpeg/gstffmpegdemux.c b/ext/ffmpeg/gstffmpegdemux.c
index 4c32ea2d9e..fba3dc2bd5 100644
--- a/ext/ffmpeg/gstffmpegdemux.c
+++ b/ext/ffmpeg/gstffmpegdemux.c
@@ -1891,7 +1891,8 @@ gst_ffmpegdemux_register (GstPlugin * plugin)
 
     /* these don't do what one would expect or
      * are only partially functional/useful */
-    if (!strcmp (in_plugin->name, "aac") || !strcmp (in_plugin->name, "wv"))
+    if (!strcmp (in_plugin->name, "aac") ||
+        !strcmp (in_plugin->name, "wv") || !strcmp (in_plugin->name, "ass"))
       goto next;
 
     /* Don't use the typefind functions of formats for which we already have
diff --git a/ext/ffmpeg/gstffmpegmux.c b/ext/ffmpeg/gstffmpegmux.c
index b0544af222..143cd72661 100644
--- a/ext/ffmpeg/gstffmpegmux.c
+++ b/ext/ffmpeg/gstffmpegmux.c
@@ -830,7 +830,8 @@ gst_ffmpegmux_register (GstPlugin * plugin)
         (!strncmp (in_plugin->name, "image", 5)) ||
         (!strncmp (in_plugin->name, "mulaw", 5)) ||
         (!strncmp (in_plugin->name, "alaw", 4)) ||
-        (!strncmp (in_plugin->name, "h26", 3))
+        (!strncmp (in_plugin->name, "h26", 3)) ||
+        (!strncmp (in_plugin->name, "ass", 3))
         ) {
       GST_LOG ("Ignoring muxer %s", in_plugin->name);
       goto next;