For a class I am creating a custom codec called .utah. The whole idea is to immerse ourselves in a large and unfamiliar code base. So far this has been very fun, and to start we have created a .utah decoder file that will simply print hello world out to the console. The problem is, if we take a .png file and rename it with a .utah, ffmpeg won't route it (at all) and if we create a .utah file using a text editor, it will save as a text file even with a .utah extension.
The question is how do we create an empty file with our own extension (in this case .utah) to test that what will happen when we pass a file to ffplay, to ensure it's properly routing to our file. More concisely, can we create a dummy .utah file that is empty but has a