r> or a valid size abbreviation.
</p>
</dd>
<dt>&lsquo;<samp>pixel_format</samp>&rsquo;</dt>
<dd><p>Select the pixel format (only valid for raw video input).
</p>
</dd>
<dt>&lsquo;<samp>input_format</samp>&rsquo;</dt>
<dd><p>Set the preferred pixel format (for raw video) or a codec name.
This option allows one to select the input format, when several are
available.
</p>
</dd>
<dt>&lsquo;<samp>framerate</samp>&rsquo;</dt>
<dd><p>Set the preferred video frame rate.
</p>
</dd>
<dt>&lsquo;<samp>list_formats</sa