added all codecs from totem, only using gst-libav for now tho; added gst-vaapi, further research required

pkgs/flatpak/codecs/gst-plugins-bad-927.patch

@@ -0,0 +1,28 @@
+From 40ab4538575dffc7791c7d289d60d30153723307 Mon Sep 17 00:00:00 2001
+From: Nicolas Dufresne <nicolas.dufresne@collabora.com>
+Date: Thu, 19 Dec 2019 15:19:29 -0500
+Subject: [PATCH] autoconvert: Fix lock-less exchange or free condition
+
+Before this change, we would free the list we just have saved.
+
+Fixes #1158
+---
+ gst/autoconvert/gstautoconvert.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/gst/autoconvert/gstautoconvert.c b/gst/autoconvert/gstautoconvert.c
+index 46bec1314..7bf7cac3c 100644
+--- a/gst/autoconvert/gstautoconvert.c
++++ b/gst/autoconvert/gstautoconvert.c
+@@ -895,7 +895,7 @@ gst_auto_convert_load_factories (GstAutoConvert * autoconvert)
+ 
+   g_assert (all_factories);
+ 
+-  if (g_atomic_pointer_compare_and_exchange (&autoconvert->factories, NULL,
++  if (!g_atomic_pointer_compare_and_exchange (&autoconvert->factories, NULL,
+           all_factories)) {
+     gst_plugin_feature_list_free (all_factories);
+   }
+-- 
+2.22.2
+