Update ms2 (ffmpeg)

[linphone] / mediastreamer2

diff --git a/mediastreamer2 b/mediastreamer2
index 1a69168c1f30a7be439606069bd8dc4d5becac02..47483a49a55765197c855eefd29c9d382eaa329a 160000 (submodule)
--- a/mediastreamer2
+++ b/mediastreamer2
@@ -1 +1 @@
-Subproject commit 1a69168c1f30a7be439606069bd8dc4d5becac02
+Subproject commit 47483a49a55765197c855eefd29c9d382eaa329a