From 1f863e6d6d1ba8aee084cf700215451fe65d76eb Mon Sep 17 00:00:00 2001
From: Edward Hervey <edward@centricular.com>
Date: Thu, 25 Mar 2021 10:29:41 +0100
Subject: [PATCH] decodebin3: Don't insert duplicated streams in collection

Filter out the ones which are already present. Can happen with several input
stream which have identical collections

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/1083>
---
 gst/playback/gstdecodebin3.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/gst/playback/gstdecodebin3.c b/gst/playback/gstdecodebin3.c
index 48d2c847f..1a242252d 100644
--- a/gst/playback/gstdecodebin3.c
+++ b/gst/playback/gstdecodebin3.c
@@ -1302,7 +1302,9 @@ get_merged_collection (GstDecodebin3 * dbin)
       for (i = 0; i < nb_stream; i++) {
         GstStream *stream =
             gst_stream_collection_get_stream (input->collection, i);
-        unsorted_streams = g_list_append (unsorted_streams, stream);
+        /* Only add if not already present in the list */
+        if (!g_list_find (unsorted_streams, stream))
+          unsorted_streams = g_list_append (unsorted_streams, stream);
       }
     }
   }