i have a bunch of mp4s. all im trying to do is desaturate them a bit, tone down the contrast a bit, and then dub them with some other mp3s. seems like it should be really simple to do but im having trouble finding a simple, free program to do it with. windows movie maker just crashes. suggestions?
Try Avidemux. Set the left menu as desired then choose a video filter. If you want to replace the audio, click on 'Audio' on the top menu and select audio from 'external source'.
