Index: renderer/CinematicFFMpeg.cpp
===================================================================
--- renderer/CinematicFFMpeg.cpp	(revision 6935)
+++ renderer/CinematicFFMpeg.cpp	(working copy)
@@ -829,7 +829,7 @@
 	_path = qpath;
 	_looping = looping;
 	_withAudio = withAudio;
-	_channels = 2;
+	_channels = 1;
 
 	bool res = false;
 	if (r_cinematic_checkImmediately.GetBool()) {
Index: sound/snd_cache.cpp
===================================================================
--- sound/snd_cache.cpp	(revision 6935)
+++ sound/snd_cache.cpp	(working copy)
@@ -433,7 +433,7 @@
 	cinematic = cin;
 
 	objectInfo.wFormatTag = WAVE_FORMAT_TAG_STREAM_CINEMATICS;
-	objectInfo.nChannels = 2;	//stereo
+	objectInfo.nChannels = 1;	//mono
 	objectInfo.nSamplesPerSec = PRIMARYFREQ;	//44100 hz
 	objectInfo.nAvgBytesPerSec = 0;	//nobody cares
 	objectInfo.nBlockAlign = sizeof(float) * objectInfo.nChannels;