Assuming you're using composite, otherwise 0 for coax
# v4l2-ctl -d /dev/video2 --set-input=1
We need to force the pixel format or you'll get discoloration
# ffmpeg -f v4l2 -channel 1 -input_format uyvy422 -video_size 720x480 -framerate 30000/1001 -i /dev/video2 -f alsa -thread_queue_size 1024 -i hw:1 -pix_fmt yuv420p -c:v libx264 -preset veryfast -crf 18 -c:a aac -b:a 192k /tmp/vhs_fixed.mp4