Pros: No need to install it, this program could be used to watch flv videos directly. Supports zoom 1x, 2x and FullScreen.

Cons: BitComet FLV Player does resize its video window automatically according to the video size of the window. However, it is not well enough, there still some black borders encircling the videos. No loop function.

BitComet is best known for its torrent-downloading program, but this FLV player is not a bad entry into that field, either. It is quite easy to use, see a screenshot of this program: 


BitComet FLV Player is a standalone application to play Flash Video files - including .flv file and .swf file. There is no button listed on the panel, so, if you wanna watch a video, you could select "Open" from the menu or just drag the video file to the play window.

It is very easy on system resources. When I used this program to watch a video, it only occupied 36KB RAM, too little to affect other program normal working.

It supports zoom 1x, 2x, and FullScreen, and you could adjust the window size according to your need. it also allows you to control the video (i.e. forword and backward).

Conclusion:
I've tried several FLV players, such as Easy FlV Player, Sothink Flv Player, and some others. They all have their own merits. Bit FLV Player is a quite nice choice when you need a FlV player - small size, no need to install, and it hardly takes systerm rescource. According to its performance, it deserves recommended.