how to enable transcoding

Can I get instructions on how to enable video transcoding on FreeSWITCH 1.6? I did not see this covered in the books. I tried the following: sip_profiles/internal.xml: <param name="disable-transcoding" value="false"/> <param name="inbound-late-negotiation" value="true"/><param name="inherit_codec" value="true"/> vars.xml: <action application="set" data="media_mix_inbound_outbound_codecs=true"/><action application="set" data="proxy_media=false"/> And I enabled some different video codecs. Also tried: "Mixing Media/Codecs on different legs (transcoding)" from  Codec Negotiation - FreeSWITCH - Confluence but these instructions seem odd, for example I think you would want "late-negotiation".