With the advent of IDL 6.3 my old AVI routines stopped working. Rather than trying to rework the old code I decided to start fresh. This new dll has several new features that will be of use to the IDL community. The new codec keyword allows you specify the compression codec directly. If this keyword is undefined then the user chosen value will be passed back to the IDL code. This dll will also work with the avisynth frameserver (www.avisynth.org) allowing IDL to read/write MPEG and Quicktime files. Please see the example programs in the zip file below to see how these work.