XviD is a codec based on the MPEG-4 standard. The codec distorts colors but it has high definition in dynamic scenes. XviD is constantly updating because it is an open source codec and anyone who is interested can participate in the development of the program. Using XviD may be illegal in some countries because the compression methods used in MPEG-4 are patented.

WavPack lossless audio compression. Note that, when converting .wav to this format and back again, the RIFF header is not necessarily preserved losslessly (though the audio is).