ffdshow is completely different, really. This community doesn't have much love for ffdshow so it isn't part of this pack and I keep it off of my testbeds. Not sure why your decoding path is looping like that; mine is fine. Please list this info for the affected video: 4CC, compatible video codecs, and stream type. This is all reported by gspot for a properly encoded file. AFTER you get this data, click on RENDER, wait for it to finish, and then click on "Rendering successful (click for details)". I'd be interested to hear what is in there as well. Although it may be for naught with ffdshow on your machine now...it tends to hijack most types of multimedia streams. 3ivx is not part of this pack.