diff --git a/2014/make.py b/2014/make.py
index e07116a..e87ab2b 100755
--- a/2014/make.py
+++ b/2014/make.py
@@ -236,7 +236,7 @@ def render(infile, outfile, sequence, parameters={}, workdir='artwork'):
 
 	# invoke avconv aka ffmpeg and renerate a lossles-mp4 from the frames
 	#  if we're not in debug-mode, suppress all output
-	os.system('cd {0} && avconv -f image2 -i .frames/%04d.png -target pal-dv "{1}"'.format(workdir, outfile) + ('' if debug else '>/dev/null 2>&1'))
+	os.system('cd {0} && avconv -ar 48000 -ac 2 -f s16le -i /dev/zero -f image2 -i .frames/%04d.png -target pal-dv "{1}"'.format(workdir, outfile) + ('' if debug else '>/dev/null 2>&1'))
 
 	# as before, in non-debug-mode the thread-worker does all progress messages
 	if debug: