Sorry, I was misremembering on two counts: it’s x264 that does this, not ffmpeg (but you’re using x264 if you’re making H.264 with ffmpeg); and the info is the

Sorry, I was misremembering on two counts: it’s x264 that does this, not ffmpeg (but you’re using x264 if you’re making H.264 with ffmpeg); and the info is the encoder’s actual settings, not the flags (so a preset like “veryslow” will get expanded). With those caveats, the information is displayed for example by mediainfo under “Encoding settings”.