What is the difference between AVI and AVI with alpha?

An AVI file with alpha has an alpha transparent channel, and through this channel, the AVI with alpha file can be added to other video files by video editing software to do alpha blending.

Source----AVI Knowledge Originate from Moyea software

What is FLV? How does the generated SWF file work as FLV player?

FLV, a short term for Flash Video, is a kind of video format that is commonly used by many websites and users. Videos from websites like YouTube and Google Video are in FLV format. FLV can not be played directly by Flash Player or browser. If you select to generate SWF file to play outside FLV, the SWF file would works as a shell and enable the FLV to play on Flash Player.

Source:Flash Knowledge

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