Wouldn't that intern just use an NLE (be it Premiere, Davinci Resole etc) anyway? If you need to style subtitles and edit shorts and video content, you'll need a proper editor anyway.

1. download a larger video from s3. 2. Use NLE and cut it into shorts. (crop, resize, subtitles etc.) 3. Upload shorts on YouTube, Instagram, Tiktok.

He does use davinci resolve but only for 2.

NLEs make ffmpeg a standalone yet easy to use tool.

Not denying that major heavy lifting is done by the NLE. We go a step ahead and make it embeddable in a larger workflow.