Currently BBC One is using these to serve live coverage of their World Cup footage.
<?xml version="1.0" encoding="UTF-8"?>
<!-- bbc_one_london.html r13490 -->
<playlist xmlns="http://bbc.co.uk/2008/emp/playlist" revision="1">
<config>
<plugin name="iPlayerLiveStats"/>
<plugin name="spacesReporting"/>
</config>
<id>tag:bbc.co.uk,2009:simulcast:bbc_one_london:playlist</id>
<link rel="alternate" href="http://www.bbc.co.uk/bbcone/"/>
<title>BBC One</title>
<summary>-</summary>
<link rel="holding" href="http://www.bbc.co.uk/iplayer/images/tv/bbc_one_london_640_360.jpg" width="640" height="360" type="image/jpeg"/>
<updated>2009-09-24T12:10:00Z</updated>
<item kind="programme" live="true" simulcast="true" identifier="bbc_one_london" group="bbc_one_london">
<id>tag:bbc.co.uk,2009:simulcast:bbc_one_london</id>
<service id="bbc_one_london" href="http://www.bbc.co.uk/bbc_one_london">BBC One London</service>
<masterbrand id="bbc_one" href="http://www.bbc.co.uk/iplayer/bbc_one">BBC One</masterbrand>
<media kind="video" width="688" height="386" bitrate="1500" type="video/mp4" encoding="h264">
<connection kind="akamai" application="live" identifier="bbc1_inlet_1500@s13633" server="cp80627.live.edgefcs.net" tokenIssuer="akamaiUk" />
</media>
<media kind="video" width="640" height="360" bitrate="800" type="video/mp4" encoding="h264">
<connection kind="akamai" application="live" identifier="bbc1_inlet_800@s13632" server="cp80627.live.edgefcs.net" tokenIssuer="akamaiUk" />
</media>
<media kind="video" width="640" height="360" bitrate="480" type="video/mp4" encoding="h264">
<connection kind="akamai" application="live" identifier="bbc1_inlet_500@s13631" server="cp80627.live.edgefcs.net" tokenIssuer="akamaiUk" />
</media>
</item>
</playlist>
It would be nice if we could work out what else is needed to support these. I've tried commenting out the skip and using latest rtmpdump, but without success thus far.