 OSX &gt;= 10.7 as well as on iOS.
</p>
<p>The input filename has to be given in the following syntax:
</p><div class="example">
<pre class="example">-i &quot;[[VIDEO]:[AUDIO]]&quot;
</pre></div>
<p>The first entry selects the video input while the latter selects the audio input.
The stream has to be specified by the device name or the device index as shown by the device list.
Alternatively, the video and/or audio input device can be chosen by index using the
&lsquo;<samp>
    -video_device_index &lt;INDEX&