Stuff to keep. Without any particular order. Nothing important.
Record 25 sec:
ffmpeg \
-f alsa -ac 2 -i hw:1 \
-f v4l2 -s 1920x1080 -input_format h264 -i /dev/video1 -r 24 \
-t 25 \
-c:a flac -ac 1 \
-c:v copy \
-y c920.test.mkv