The 2 parameter is the "preroll":
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The preroll should be set to at least the number of frames the filter needs to pre-process to fill its buffers and/or updates its internal variables. This last argument is used in some filters like: SmartBob?, SmartDeinterlace?, TemporalCleaner? and others. The reason is that due to filtering architecture of Virtual Dub the future frames can't be accessed by a filter. Dividee reports: "In the "Add filter" dialog of VirtualDub, some filters have a "Lag:" value in their description. I think this is the value that must be used as preroll. Unfortunately, this indication is not always present. In those cases you have to guess." Of course you can always ask the creator of the filter.
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The Delogo filter is for
removing logos whereas it sounds like you want to apply a logo. You want to get my Logo filter from the URL below and import that.