what is the difference from a flash video file and a source file
The difference is the compression used. Flash video format, or FLV (or sometimes F4V) is a compression format used specifically for flash videos. A source file, can be compressed using any number of techniques, and using any number of encoders. Some of the most common type of video compression use the file formats AVI, MP4, or a few others.
A quick overview look at the different formats can show some features, and benefits generally, but the format that works best depends on your users. When distributing online, FLV and flash players are pretty much you're only option since the WebM format is still a little ways out from common adoption. A few others have adopted the
.mov file format for quicktime streaming, and others have gone with silverlight for video encoding, which (I believe) plays
.wmv formatted files.
Hopefully that gives you a little insight into this. I'd recommend doing a bit of research on the topic as my experience is mostly offline based when it comes to video compression, storage, and streaming.
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