This used to work, but now I can't find any way to import videos into Photoshop to make GIFs. 
When I go to import a video, mp4s are greyed out but I can still select avi files.
When I select an avi file, the preview comes up blank.
When it imports, every layer is black.
This feature used to work perfectly, but now it won't work at all! The avi files play fine in Quicktime Player, for which I have the Perian add-on.
Please can someone help me out?