That's an interesting idea. If you're writing the whole backend yourself, it would work, but wouldn't you run into issues if you're using tools that expect individual video files (e.g., utilities to generate thumbnails)? It's taking something that could just be static files (possibly even an entire static site) and introducing on-the-fly processing.
With the help of this same ffmpeg tool your script could generate/re-generate thumbs when it is necessary (or meta-data updated) if you need them in separate files, of course :-).
That's an interesting idea. If you're writing the whole backend yourself, it would work, but wouldn't you run into issues if you're using tools that expect individual video files (e.g., utilities to generate thumbnails)? It's taking something that could just be static files (possibly even an entire static site) and introducing on-the-fly processing.