 desktop.
</p>
<p>Note that the offset calculation is from the top left corner of the primary monitor on Windows. If you have a monitor positioned above your primary monitor, you will need to use a negative <var>offset_y</var> value to move the region to that monitor.
</p>
</dd>
</dl>

<a name="iec61883"></a>
<h2 class="section"><a href="ffmpeg-devices.html#toc-iec61883">3.11 iec61883</a></h2>

<p>FireWire DV/HDV input device using libiec61883.
</p>
<p>To enable this input device, you need libiec61883, libr