[pitivi] Update gst-transcoder submodule

[Thibault Saunier <tsaunier src gnome org>]

commit 07f9805286c144109a7b3abcde5f0afd0b57064a
Author: Thibault Saunier <tsaunier gnome org>
Date:   Mon Aug 1 16:51:19 2016 -0400

    Update gst-transcoder submodule

 subprojects/gst-transcoder |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/subprojects/gst-transcoder b/subprojects/gst-transcoder
index a0f5a4e..db82989 160000
--- a/subprojects/gst-transcoder
+++ b/subprojects/gst-transcoder
@@ -1 +1 @@
-Subproject commit a0f5a4e184c9b4ee427e1d6037ba80a907c372f6
+Subproject commit db82989f7d9532406d24a4dfba1456819edba505