> due to FFmpeg back then lacking any framework for code sharing between components and codecs

Funny, I remember this being completely different; FFmpeg bundled ffserver, which transcoded to a bunch of codecs at the same time (sharing motion search and everything) precisely to demonstrate how similar the codecs were and how much could be shared. (Of course, that could easily be spaghetti, but not spaghetti for non-code-sharing reasons.) All on the 400MHz-class machines we had at the time. Do I remember wrong? I haven't looked at these old releases in forever.