From 3d3134f39932da90e18e4f0651162952811a1651 Mon Sep 17 00:00:00 2001
From: Michael Kessler <michaelk@image-engine.com>
Date: Wed, 21 Jan 2015 16:55:16 -0800
Subject: [PATCH 1/2] Allows for the option of recording no audio.

---
 audio.py    | 4 ++++
 recorder.py | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/audio.py b/audio.py
index aaf8525..b652a3c 100644
--- a/audio.py
+++ b/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):
 
diff --git a/recorder.py b/recorder.py
index 1b886b7..8c61434 100644
--- a/recorder.py
+++ b/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 ' + \

From f34f9cf93dbea869585a6eb23bc5a8fa61ba3171 Mon Sep 17 00:00:00 2001
From: Michael Kessler <michaelk@image-engine.com>
Date: Wed, 21 Jan 2015 17:54:02 -0800
Subject: [PATCH 2/2] Ignores audio channel for output arguments when using "No
 Audio"

---
 recorder.py | 29 ++++++++++++++++++++---------
 1 file changed, 20 insertions(+), 9 deletions(-)

diff --git a/recorder.py b/recorder.py
index 8c61434..1eb862d 100644
--- a/recorder.py
+++ b/recorder.py
@@ -84,15 +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
 
 # =============================================================================