When you install a DVD playback software, it comes with a DVD video decoder, and a DVD audio decoder. If the AC3 of DVD’s is the same as the AC3 of divx-like videos (*.avis, etc), can the DVD Audio decoder decode this AC3 track inside the divx videos, instead of the AC3 Filter () ? Not that simple. Unless the decoder supports it directly (as AC3 Filter does) you would need an AC3/AVI parser filter, otherwise the decoder can’t connect to the avi splitter. MPC has a built in parser though. AC3FILTER IS INTRUSIVE! IT PUTS ITSELF INTO EVERY DIRECTSHOW GRAPH!! The best thing to do is to lower its merit from the AC3 Filter control pannel (not from a DirectShow filter explorer). Go to the “system” tab and check “prefer other decoders”. If you check the filter merit value in a DirectShow filter explorer, like BsPlayer, lowering the value in the AC3Filter options from “prefer AC3Filter” to “prefer other deocdeers” will switch the value from 10000000 to 0040000