how to play flv videos on mac

Install Perian.

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Another way is to convert FLV videos to MOV, I used the iOrgsoft FLV video converter to do this job.

like Niel said, install Perian: you do not have to do anything anymore when you encounter the next flv (or other). Converting has the disadvantage, that it will degrade the quality (more or less), and you have to do it for each next time you encounter a flv (or other) that you want to play.

Perian works fine in OSX including mountain Lion.