Feature List:
Supported formats depend on Operating System and installed codecs. Below is a table outlining the currently supported formats by OS.

Input Formats	Windows	Linux	OSX
iyuv/i420, yv12 and yuv9 avi, mjpg avi, mpng avi, wav, jpg, png, bmp	x	x	x
Other avi files (depending on installed codecs)	x
aif, snd, ico, cur, gif	x
pnm, pbm, pgm, ppm, xpm, xbm	x	x
Output Formats
i420/iyuv-avi, motion-jpg avi, motion-png avi, wav	x	x	x

If you find that your files are incompatible, check out t@b Media Converter, a graphical front-end for mencoder and sox.

Note: On Windows only DV type 2 avi files are supported.  DV type 1's will need to be converted using t@b Media Converter or some other program.