Screen capture with ffmpeg + vaapi, how to add sound

Question

System : Ubuntu 20.04, 5.13.0-44-generic

Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Raven/Raven2/Fenghuang HDMI/DP Audio Controller Encryption controller: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 10h-1fh)

I use the following command to capture screen :

ffmpeg -vaapi_device /dev/dri/renderD128 -f x11grab -video_size 1920x1080 -i :0 -vf 'hwupload,scale_vaapi=format=nv12' -c:v h264_vaapi -qp 24 output.mp4

please refer to wiki ffmpeg

I got the video in good quality, but there is no example to capture audio in context of vaapi.

To get audio, I tried : wiki ffmpeg capture desktop

This command as example for audio capture :

ffmpeg -video_size 1024x768 -framerate 25 -f x11grab -i :0.0+100,200 -f alsa -ac 2 -i hw:0 output.mkv

And got the respective audio stream also.

I tried to combine the "vaapi" command with audio part :

-f alsa -ac 2 -i hw:0

of the second command, but got an error message "cannot open audio device hw:0":

ffmpeg -vaapi_device /dev/dri/renderD128 -f x11grab -video_size 1920x1080 -i :0 -f alsa -ac 2 -i hw:0 -vf 'hwupload,scale_vaapi=format=nv12' -c:v h264_vaapi -qp 24 output.mp4

Has someone an idea to get also the audio capture in conjunction with the first "vaapi" command ?