Huffyuv - Lossless Video Codec Why Huffyuv? What is Huffyuv ? Aside from VirtualDub, the only thing you may need/want to actually install is the Huffyuv codec (for most systems) or Huffyuv-Multithreaded (for dual-core and quad-core computers). These are "lossless" (not compressed) video codecs for retaining high quality on your newly-filtered or intermediary video. Huffyuv64 is available too, although it's generally not needed, as Huffyuv and Huffyuv-MT still work fine on both Windows Vista 64 and Windows 7 64-bit. Installing Huffyuv To install Huffyuv, simply unRAR the correct file, and then right-click and install the INF file. If you can't tell the difference between the DLL and the INF file, you have Windows setup to hide file extensions -- something that I suggest against.