My previous post seems to have gone missing so here's take 2.
To play FLV files with TCPMP you need a plugin 'cause it can't handle it as is. The plugin is available here and I tried it out on my X30H and it worked fine playing a local file. (Though I downloaded the .zip file which only includes the two .plg files for TCPMP, not the exe they mention for downloading files off Youtube.)
SourceForge.net: TCPMP Plugin for Flash Video on PPC