I don't know where it ranks in terms of your question points, but MoviePy is another well liked Python library that seems to wrap ffmpeg, and will also make use

I don't know where it ranks in terms of your question points, but MoviePy is another well liked Python library that seems to wrap ffmpeg, and will also make use of ImageMagick for some functions. I used MoviePy a few years ago to add subtitles to a short video. It was fairly easy to write a script to place bits of text at specific frames. I'm interested to learn more about the differences and similarities of ffmpeg-python and MoviePy and will put some energy into that. https://github.com/Zulko/moviepy https://github.com/Zulko/moviepy