MediaCoder is known to be fully standalone and not dependent on any splitters, decoders, and filters that have to be installed in the system. However, in some cases, we do need to make use of those stuffs to achieve some goals. AviSynth is the bridge between splitters/decoders/filters and multimedia applications. There are two ways for using AviSynth with MediaCoder. Of course, as a precondition, you need to install AviSynth and possibly a codecs pack (e.g. K-lite) which contains a bunch of splitters and decoders.