There you say "The application must contain exclusively original code and the Participant must be the original author of the content".
So there is a problem, for example: When we convert from our program a file using ffmpeg?.
Is that against Novelty?
It means it should be new in both code and features. A nice GUI for ffmpeg would certainly be a worthwhile submission, but yet another simple text editor or image viewer probably won't get very high marks from the judges.