1. Download and install Advanced Renamer
  2. Open Advanced Renamer.  Add – Directory and choose the folder that contains the sequential set of files.
  3. Add method.  Choose ‘New Name’ from the dropdown list.
  4. In the entry box, use a name like the following:
  5. This will create 4 digit sequential filenames ending in BMP.  The first file name will be 1731.bmp
  6. Click ‘Start Batch’ (you can use ‘Test Batch’ if you want to check the results of the rename process first).

These sequential bitmaps can then be joined into a AVI file.  Refer to the main post entitled Distributed Parallel Rendering in Revit.