DubMan can generate AviSynth scripts to use in the processing of video with VirtualDub. AviSynth must be installed for this feature to work (download from http://www.avisynth.org/). The AviSynth tab in the Add/Edit Jobs dialog contains a mini AviSynth script editor. You can load scripts from a file, or write it directly there. The script is stored within the job template. When writing the script, you can use %1 in the place of the input file. This will be replaced with the value of the Input File Name from the Standard tab. This allows the AviSynth script to work with bulk files and have its input verified by the file checker.
Refer to the AviSynth homepage (http://www.avisynth.org/) for information on using AviSynth and its scripting language.