Few factors affect while repairing an AVI file. However, this situation happens only when the AVI file is severely corrupted beyond repairing. The software does repair the AVI file to its efficient. The reason for the blank video may be the video frames got severely corrupted. We recommend using the demo version before purchasing the full version. Using the demo version you can preview the repaired file, if the file can be repaired successfully.
We would still help you to repair the AVI file if you could contact our Technical Support.