Consider...
Placing the AVI on the timeline, then splitting it and deleting most of the file, so only a single thirty-second segment remains.
Click FILE|SAVE AS PORTABLE PROJECT, saving to a convenient folder on your PC.
Sign up for a free account at GoogleDrive or DropBox, then upload the file you saved and publicly share it, posting the link here.
This will allow folks to duplicate your efforts, and note whether the saturation issue appears.