Develop a Mac Application

I need an application built to convert .str files into more common video file formats such as .avi, .vob, .mov. The application can be compatible with either a Mac or PC (preferably a Mac) I have an LG Smart TV. I record free to air TV onto an external hard drive. I want to convert what I've recorded into .vob, .avi, .mov etc files. See file attached. I did a short 30 second test so you can see the files that are produced when I record TV onto the external hard drive. The .str file is the largest & is the video file.