dd><p>Force a specific decoder implementation for the stream identified by
<var>media_specifier</var>, which can assume the values <code>a</code> (audio),
<code>v</code> (video), and <code>s</code> subtitle.
</p>
</dd>
<dt>&lsquo;<samp>-acodec <var>codec_name</var></samp>&rsquo;</dt>
<dd><p>Force a specific audio decoder.
</p>
</dd>
<dt>&lsquo;<samp>-vcodec <var>codec_name</var></samp>&rsquo;</dt>
<dd><p>Force a specific video decoder.
</p>
</dd>
<dt>&lsquo;<samp>-scodec <var>codec_name</var></samp>&rsquo;<