Hello,
There is a source python file for the TSV Converter. It is attached. It was not previously posted on GitHub since the Windows and Mac apps are all that most people need, but I will make sure it gets added. All of our software is open-source of course, we just missed getting this posted somewhere.
You should be able to run the python file (dependent on python 2), but do not use the system theme, and you will need to have a copy of FFmpeg to get it working properly. The TSVConverter is mostly a UI wrapper for FFmpeg.
A .tsv file can be an mp4, gif, or converted image
Hope that helps!
RĂ©na