The title says it all really. Was wondering if there's a simpler interface to implement which does not contain video or audio, but just a still frame image.
I don't care about exporting this format from Premiere, just being able to read a single frame or a sequence of frames to be used as footage.
A standard importer plug-in is the way to go for a still image importer. You could start from SDK_File_Import in the SDK. There is also a WebM plug-in on GitHub: