Are you getting an error message or is the player not showing up at all?
I've got my player installed and working with the demo but not with my implementation on my site.
It's working on the demo with this code:
http://www.cravenswarren.com/insurance/plugins/osflv/demo.php
<script charset='ISO-8859-1' src='/insurance/plugins/osflv/rac.js' language='javascript'></script><script language='javascript'>
var src = 'player';
if(!DetectFlashVer(9, 0, 0) && DetectFlashVer(8, 0, 0))
src = 'player8';
AC_FL_RunContent('codebase', 'http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,0,0', 'width', 400, 'height', 340, 'src', src, 'pluginspage', 'http://www.macromedia.com/go/getflashplayer', 'id', 'flvPlayer', 'allowFullScreen', 'true', 'movie', src, 'FlashVars','movie=video.flv&autoload=off&volume=70');
</script>
<noscript>
<object width='400' height='340' id='flvPlayer'>
<param name='allowFullScreen' value='true'>
<param name='movie' value='/insurance/plugins/osflv/player.swf?movie=video.flv&autoload=off&volume=70'>
<embed src='/insurance/plugins/osflv/player.swf?movie=video.flv&autoload=off&volume=70' width='400' height='340' allowFullScreen='true' type='application/x-shockwave-flash'>
</object>
</noscript>
But it's not working here with this code:
http://www.cravenswarren.com/insurance/mediaserve.php?serve=play|252|/insurance_videos/Property_Insurance_001.flv
<script charset='ISO-8859-1' src='/insurance/plugins/osflv/rac.js' language='javascript'></script><script language='javascript'>
var src = 'player';
if(!DetectFlashVer(9, 0, 0) && DetectFlashVer(8, 0, 0))
src = 'player8';
AC_FL_RunContent('codebase', 'http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,0,0', 'width', 480, 'height', 310, 'src', src, 'pluginspage', 'http://www.macromedia.com/go/getflashplayer', 'id', 'flvPlayer', 'allowFullScreen', 'true', 'movie', src, 'FlashVars','movie=../../assets/files/insurance_videos/Property_Insurance_001.flv&fgcolor=0x601142&bgcolor=0x999999&autoload=off&volume=70');
</script>
<noscript>
<object width='480' height='310' id='flvPlayer'>
<param name='allowFullScreen' value='true'>
<param name='movie' value='/insurance/plugins/osflv/player.swf?movie=../../assets/files/insurance_videos/Property_Insurance_001.flv&fgcolor=0x601142&bgcolor=0x999999&autoload=off&volume=70'>
<embed src='/insurance/plugins/osflv/player.swf?movie=../../assets/files/insurance_videos/Property_Insurance_001.flv&fgcolor=0x601142&bgcolor=0x999999&autoload=off&volume=70' width='480' height='310' allowFullScreen='true' type='application/x-shockwave-flash'>
</object>
</noscript>
As you can see the code for both is nearly identical (only the flv files change)
The link to the player and file work by themselves...
http://www.cravenswarren.com/insurance/plugins/osflv/player.swf?movie=../../assets/files/insurance_videos/Property_Insurance_001.flv
So why aren't they working in the script?
