on_border</samp>&rsquo;</dt>
<dd><p>Set the region border thickness if &lsquo;<samp>-show_region 1</samp>&rsquo; is used.
Range is 1 to 128 and default is 3 (XCB-based x11grab only).
</p>
<p>For example:
</p><div class="example">
<pre class="example">ffmpeg -f x11grab -show_region 1 -framerate 25 -video_size cif -i :0.0+10,20 out.mpg
</pre></div>

<p>With <var>follow_mouse</var>:
</p><div class="example">
<pre class="example">ffmpeg -f x11grab -follow_mouse centered -show_region 1 -framerate 25 -video_size 