Cinepak? Wow, that's a blast from the past! Cinepak is 15+ years old right now, and is almost unbelivablly primative compared to anything anyone under 30 has ever seen. But hey, it could do 320x240 15 fps on a 50 MHz computer! And only took 80 minutes to encode a minute of video on that era's fastest computer...
It was the start of the vector quantization era of multimedia codces, which ended with Sorenson Video 3.
The guy who designed it is now the CTO of Microsoft's MediaRoom (IPTV) group.
http://en.wikipedia.org/wiki/Cinepak
.flv uses either H.263 or VP6. How about you back up a bit and tell us what your content is like and what you want to do with it.
Ben Waggoner
Principal Video Strategist, Silverlight
Microsoft Corporation
Compression Blog: on10.net/blogs/benwagg/
Compression Classes at Stanford and PSU: on10.net/blogs/benwagg/21622/