diff --git a/pandora_client/extract.py b/pandora_client/extract.py
index 0adf7b8..b3f4625 100644
--- a/pandora_client/extract.py
+++ b/pandora_client/extract.py
@@ -257,13 +257,15 @@ def video_cmd(video, target, profile, info):
             video_settings += ['-map', '0:%s,0:%s' % (info['audio'][0]['id'], n)]
             mono_mix = False
         audio_settings = ['-ar', str(audiorate), '-aq', str(audioquality)]
-        if not mono_mix:
+        if mono_mix:
+            ac = 2
+        else:
             ac = info['audio'][0].get('channels', audiochannels)
-            if ac:
-                ac = min(ac, audiochannels)
-            else:
-                ac = audiochannels
-            audio_settings += ['-ac', str(ac)]
+        if ac:
+            ac = min(ac, audiochannels)
+        else:
+            ac = audiochannels
+        audio_settings += ['-ac', str(ac)]
         if audiobitrate:
             audio_settings += ['-ab', audiobitrate]
         if format == 'mp4':