FFmpeg : Desktop Recording for YouTube

Question

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.

Answer 1

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high -level 4.0 - You don't need to set a profile or level because you're not targeting any specific, limited, or outdated devices.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.