Why does the sound stutter during playback? You cannot crop in direct stream copy mode - the cropped video must be recompressed. You can sometimes get more natural results by applying the blur/sharpen/etc. The reason you can crop before any filter is that filters that are spatial (area-based) tend to exhibit artifacts at the edge of the image, where the area filters are poorly defined. If you don't have any video filters you want to run, add a "null transform" filter and then add cropping to that. VirtualDub allows you to crop at the beginning of any video filter you can do it by clicking on a video filter and then "cropping." This option is called "clipping" in versions prior to 1.4. VirtualDub documentation: Processing There are a few areas of VirtualDub that are rougher than they should be.
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