DaVinci Resolve on ubuntu linux how to solve codac problem, record on OBS, mov/mkv/mp4 problem

DaVinci Resolve

recod in OBS
export as MP4
  if you have exported to mkv
  convert it first to mp4
  $fmpeg -i ./source/3.mkv -c:v libx264 -preset ultrafast -crf 0 ./mp4/3.mp4
convert to mov
$ ffmpeg -i raw_footage.mp4 -vcodec mjpeg -q:v 2 -acodec pcm_s16be -q:a 0 -f mov footage_mjpeg.mov
import in davinci resolve
export as youtube file (will come out without audio)
Encode back
$ ffmpeg -i final_cut.mov -c:v libx264 -preset ultrafast -crf 0 final_video.mp4

https://www.youtube.com/watch?v=WLcW4UWPC5Y
Encode in MJPEG: ffmpeg -i raw_footage.mp4 -vcodec mjpeg -q:v 2 -acodec pcm_s16be -q:a 0 -f mov footage_mjpeg.mov
Encode back to H264: ffmpeg -i final_cut.mov -c:v libx264 -preset ultrafast -crf 0 final_video.mp4

sudo apt-get update -y
sudo apt-get install -y v4l2loopback-dkms

sudo killall gvfs-gphoto2-volume-monito
modprobe v4l2loopback exclusive_caps=1 max_buffers=2
gphoto2 --auto-detect
gphoto2 --stdout --capture-movie | ffmpeg -i - -vcodec rawvideo -pix_fmt yuv420p -threads 0 -f v4l2 /dev/video0