MPEG4 Modifier is a tool that lets you alter AVI attributes without re-encoding. The compatible video file format is MPEG4 ASP, which belongs to the XviD and DivX codices. You may modify the aspect ratio, for both the presentation and pixels. It is also possible to modify the user data or alter the interlaced field order. MPEG4 modifier helps with a few other functions, including the ability to delete or add ‘packed bitstream’, show data about the used quantity of B-VOPs, and ascertain if the video incorporates GMC or QPel.