(under construction. Comments/corrections/additions are welcome)
| Comment | Skeleton in the closet | Compression ratio (*) | |
| DivX | Commercial MPEG4 video codec | MS Mpeg4 v3 | H 263:1 |
| XviD | Open-source MPEG4 video codec | OpenDivX | 220v:1 |
| XVD | Proprietary video codec | None | $330:1 |
| VXD | Virtual Device Driver | None | 1:1 |
(*) based on the test results provided by "Vasya Pupkin and Associates" independent test lab.