Remove debugging messages

diff --git a/src/ffmpeg b/src/ffmpeg
index 393f0349bfb53860d5b44e8b936395bd5727914c..cdf15dec5cfb777438a30a2df7dd6c215e0dac74 160000 (submodule)
--- a/src/ffmpeg
+++ b/src/ffmpeg
@@ -1 +1 @@
-Subproject commit 393f0349bfb53860d5b44e8b936395bd5727914c
+Subproject commit cdf15dec5cfb777438a30a2df7dd6c215e0dac74