Input:

const runCommand = require('./runCommand')

runCommand(
    'ffmpeg',
    `-threads:v 2 -threads:a 8 -filter_threads 2 -thread_queue_size 512 \
-loop 1 -i ./place.png \
-stream_loop -1 \
-i ./track.mp3 \
-pix_fmt yuv420p -c:v libx264 -qp:v 19 -profile:v high -rc:v cbr_ld_hq -level:v 4.2 -r:v 60 -g:v 120 -bf:v 3 -refs:v 16 -preset fast -f flv rtmp://a.rtmp.youtube.com/live2/${process.env.streamkey}`,
    (data) => console.log(data),
    () => console.log('finished')
  )

Output:

x    
frame=  588 fps=8.7 q=21.0 size=    9000kB time=00:00:22.76 bitrate=3238.2kbits/s speed=0.339x    
frame=  590 fps=8.7 q=19.0 size=    9001kB time=00:00:22.83 bitrate=3229.4kbits/s speed=0.336x    
frame=  597 fps=8.7 q=21.0 size=    9007kB time=00:00:23.11 bitrate=3191.5kbits/s speed=0.337x    
frame=  603 fps=8.7 q=20.0 size=    9012kB time=00:00:23.36 bitrate=3159.3kbits/s speed=0.338x    
frame=  608 fps=8.7 q=21.0 size=    9016kB time=00:00:23.56 bitrate=3133.9kbits/s speed=0.339x    
frame=  614 fps=8.8 q=19.0 size=    9021kB time=00:00:23.80 bitrate=3104.9kbits/s speed=0.339x    
frame=  617 fps=8.7 q=21.0 size=   10702kB time=00:00:23.92 bitrate=3663.8kbits/s speed=0.337x    
frame=  623 fps=8.7 q=20.0 size=   10735kB time=00:00:24.16 bitrate=3638.9kbits/s speed=0.338x    
frame=  629 fps=8.7 q=21.0 size=   10740kB time=00:00:24.40 bitrate=3605.8kbits/s speed=0.338x    
frame=  635 fps=8.7 q=20.0 size=   10745kB time=00:00:24.63 bitrate=3573.1kbits/s speed=0.339x    
frame=  643 fps=8.8 q=20.0 size=   10751kB time=00:00:24.96 bitrate=3527.4kbits/s speed=0.341x    
frame=  646 fps=8.8 q=19.0 size=   10754kB time=00:00:25.08 bitrate=3512.1kbits/s speed=0.341x    
frame=  651 fps=8.8 q=20.0 size=   10758kB time=00:00:25.28 bitrate=3485.6kbits/s speed=0.341x    
frame=  656 fps=8.8 q=21.0 size=   10762kB time=00:00:25.48 bitrate=3459.6kbits/s speed=0.341x    
frame=  658 fps=8.7 q=19.0 size=   10764kB time=00:00:25.56 bitrate=3448.7kbits/s speed=0.338x    
frame=  664 fps=8.7 q=21.0 size=   10769kB time=00:00:25.81 bitrate=3417.9kbits/s speed=0.338x

Why is my FPS so low when streaming to Youtube?

P.S. The process is using very low memory and CPU, can I sacrifice a bit more for it?