mpeg4 format preferred.
If you are looking for having large media files, opt for a host that can give you streaming media support on your account. Unfortunately though you wouldn't find many 3$/Mo unlimited everything hosting accounts truely supporting streaming media. If you are on your own dedicated box, install Darwin Streaming Media Server. This would also enable you to play with H.264 format and start broadcasting too.

Other alternative to Darwin Streaming Media server is Helix Universal Server but support for mpeg4 is only available in PAID version.

Would need a high bandwidth server in this case if you are really aiming at professional quality media streaming. Let me know if you need professional support on Streaming Media Server Projects.

Thanks
HyTC
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