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I was reading YouTube Help Recommended upload encoding settings page, and I found this command from a site Youtube recommended encoding settings for FFmpeg.

ffmpeg -f gdigrab -framerate 60 -i desktop -f dshow \
  -i audio="Microphone (2- Realtek Audio)" -c:v libx264 -preset slow -crf 18 \
  -profile:v high -level 4.0 -pix_fmt yuv420p -bf 2 -coder 1 -b:v 15M -c:a aac \
  -ar 48000 -ac 2 -b:a 384k output.mp4

I modified the command to capture my desktop and microphone, but I was wondering if this is the best quality I can get or whether there are any improvements I can make. My goal is to get the best quality for a 1080p60 video.

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  • @MarianD, note that by breaking lines using \ you made this command linux (and mac) only, when there was no any information about OS and it's possible that the question is about windows.
    – Qwertiy
    Jan 14, 2021 at 15:27
  • @Qwertiy, you're right, I'm aware of it, but by scrolling the long line disappears the big picture (and the answerers' will for answering such a question). So I decided to use the POSIX continuation symbol \ (except questions with windows tag) — for FFmpeg users it is “lingua franca”, well-known to Windows' users, too, which have no problem to translate it to the ^ symbol.
    – MarianD
    Jan 15, 2021 at 0:04

1 Answer 1

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Remove:

  • -profile:v high -level 4.0 - You don't need to set a profile or level because you're not targeting any specific, limited, or outdated devices. These options don't matter because YouTube is going to re-encode whatever you give it and set its own profile and level.

  • -pix_fmt yuv420p - You can let YouTube deal with the pixel format.

  • -bf 2 -coder 1 - These are already handled automatically by -preset.

  • -b:v 15M - This is mutually exclusive with -crf. Just use -crf instead. It will let you set the quality instead of you trying to apply an arbitrary bitrate.

  • -ar 48000 -ac 2 - No need to change the audio rate or channel layout. If you do what to change those do it via the dshow -sample_rate and -channels input options.

So your command can look like:

ffmpeg -f gdigrab -framerate 60 -i desktop -f dshow -i audio="Microphone (2- Realtek Audio)" -c:v libx264rgb -preset slow -crf 18 -b:a 384k output.mp4
  • The input is RGB, so you can avoid the RGB to YUV conversion by using -c:v libx264rgb.
  • If your computer can handle it then consider using a slower -preset.
  • You can use flac or libopus for audio (change output.mp4 to output.mkv), but for microphone it will hardly matter.
  • You can try -crf 17 if you think you can see a difference. I wouldn't bother with the huge file increase from using lossless (-crf 0).
  • You can see if dshow is faster than gdigrab for capturing the desktop. I don't use Windows so I can't test for you.

Note that a non-FFmpeg based player may not be able to decode the file, but I'm fairly certain YouTube will have no issues with it.

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