I get a couple of errors:
michael@michael-desktop:~/Desktop/darktable training$ ffmpeg -i 2022-04-02\ darktabletraining.flv -channel_layout 5.1 -c:v libx264 -vf yadif -crf 28 -force_key_frames "expr:gte(t,n_forced*4)" -x264-params log-level=none -c:a aac -b:a 192k -preset -preset fast -strict experimental -loglevel warning -stats outfile.mp4
[NULL @ 0x559f08654080] Unable to find a suitable output format for 'fast'
fast: Invalid argument
I noticed that there were two 'preset's so I removed the one with the fast argument and I got the second error:
michael@michael-desktop:~/Desktop/darktable training$ ffmpeg -i 2022-04-02\ darktabletraining.flv -channel_layout 5.1 -c:v libx264 -vf yadif -crf 28 -force_key_frames "expr:gte(t,n_forced*4)" -x264-params log-level=none -c:a aac -b:a 192k -preset -strict experimental -loglevel warning -stats 2022-04-02\ darktabletraining.ogg
[NULL @ 0x56408b444040] Unable to find a suitable output format for 'experimental'
experimental: Invalid argument
And then decided that since I don't know what I'm doing I better ask before I blindly remove another command.