The image is 512x384, perfectly valid resolution. Applying avisynth filters requires the internal, cropped video to be multiples of 2,4 or 8 as well sometimes, make sure you hit the requirements there! (I mean, internal resolution before resizing to 512x384...) Switch to the actual build and make sure you hit "load defaults" once and disable bframes by setting them to -1. Hm, that's all I can think of. Do you have a SMP machine? Maybe that threaded code is buggy... Regards, Koepi