From 81e91e54c16841e5f5e501ea98827724b953795f Mon Sep 17 00:00:00 2001
From: Jan Schmidt <thaytan@noraisin.net>
Date: Fri, 15 May 2009 15:48:35 +0100
Subject: [PATCH] ffmpeg: Don't add sink pad template to the muxers when not
 needed.

If the set of caps for either audio or video is completely empty, skip
adding that pad template to the class. Some muxers only support audio-only
or video-only and otherwise end up with EMPTY caps in the pad template.
---
 ext/ffmpeg/gstffmpegmux.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/ext/ffmpeg/gstffmpegmux.c b/ext/ffmpeg/gstffmpegmux.c
index 55369a8207..15cbaf4593 100644
--- a/ext/ffmpeg/gstffmpegmux.c
+++ b/ext/ffmpeg/gstffmpegmux.c
@@ -719,6 +719,10 @@ gst_ffmpegmux_get_id_caps (enum CodecID * id_list)
     if ((t = gst_ffmpeg_codecid_to_caps (id_list[i], NULL, TRUE)))
       gst_caps_append (caps, t);
   }
+  if (gst_caps_is_empty (caps)) {
+    gst_caps_unref (caps);
+    return NULL;
+  }
 
   return caps;
 }