Allows for No Audio to be selected in the audio devices.

audio.py

@@ -54,6 +54,10 @@ def __init__(self):
 
                 device = Device()
 
+        nullDevice = Device()
+        nullDevice.name = "No Audio"
+        self._devices.append(nullDevice)
+
     # =========================================================================
     def deviceSet(self, index):
 

recorder.py

@@ -71,6 +71,10 @@ def videoArgs(self):
     @property
     def audioArgs(self):
 
+        # Return no arguments for audio if we are using no audio device.
+        if not self._audioDevice.api or not self._audioDevice.source:
+            return ""
+
         return '-f {f} '.format(f=self._audioDevice.api) + \
                '-ac 1 ' + \
                '-ar 48000 ' + \
@@ -80,15 +84,26 @@ def audioArgs(self):
     @property
     def outputArgs(self):
 
-        return '-map 0:0 ' + \
-               '-map 1:0 ' + \
-               '-vcodec mpeg4 ' + \
-               '-qscale:v 1 ' + \
-               '-acodec pcm_s16be ' + \
-               '-qscale:a 1 ' + \
-               '-f segment ' + \
-               '-segment_time 300 ' + \
-               '{d}recording.%04d.mov '.format(d=self._workDir)
+        # Mapping and output codecs need to be omitted with no audio.
+        hasAudio = self._audioDevice.api and self._audioDevice.source
+
+        output = '-map 0:0 '
+
+        if hasAudio:
+            output += '-map 1:0 '
+
+        output += '-vcodec mpeg4 ' + \
+                  '-qscale:v 1 '
+
+        if hasAudio:
+            output += '-acodec pcm_s16be '
+
+        output += '-qscale:a 1 ' + \
+                  '-f segment ' + \
+                  '-segment_time 300 ' + \
+                  '{d}recording.%04d.mov '.format(d=self._workDir)
+
+        return output
 
 # =============================================================================