Good, efficient and free video converters are in short supply on Macs but FLV Crunch is a definite contender.
FLV Crunch is based on the ffmpegX engine and converts your video files with ease from multiple formats to FLV which you can play on your iPhone or iPod. FLV Crunch supports conversion to and from most major formats including MPG, AVI, MP4, WMV and 3GP. Although the interface is very basic and retro looking, it is quite powerful and feature packed.
To use it, select the files you want to convert from the Menu. From there, you can select the output format and then click Start to convert. If you want, you can make changes to the frame rate (the number of frames per second), the bit rate (speed of data transfer) and resolution before you convert. There's also some useful presets for iPods, VGA, and higher definition conversions depending on what you're using the conversion for. If a conversion doesn't work, an Error Log helps you find out what went wrong - very useful if you're batch processing which FLV Crunch also supports.
FLV Crunch is a straightforward, free and powerful converter to convert media files between multiple formats on your Mac.