What happened to ffmpeg? [OT?]

[MR ZenWiz]

I know this isn't strictly about Ubuntu, but...

Within the last month or so, an update for ffmpeg came out (I run
Xubuntu 20.04.03).

Ever since that update, my video conversions via ffmpeg have taken
anywhere from 2x to 6x as long as they used to.  Same hardware, same
memory, same chewing up all 8 CPU threads, but the speed has gone to
hell.

Does anyone know why this might be?

Feedback appreciated.

Mark