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.
-- 
:-)~MIKE~(-: