VirtualDub has spawned several forks, one being the abandoned VirtualDubMod which includes features such as Matroska (MKV), OGM, and Dolby AC-3 support, none of which are present in VirtualDub without the use of third-party plugins.[27][28][29] VirtualDubMod is a unification of several earlier projects/forks, including: VirtualDub-MPEG2, VirtualDubOGM, VirtualDubAVS and more.[28][29][30][31] Another example of a fork is Nandub, which enabled use of Smart Bitrate Control.[32]