In one movie, I have to crank up the system audio to 66% (if the system suddenly plays a system notification sound my hearing is killed), in another movie I am back to my default 28% volume.
We're in the age of AI and smart appliances. If there is a SMART movie player, it will automatically determine the loudness of the video and normalize the volume so it remains consistent audio output.
中文 
Deepin System Updates (2022.6.15） 
In one movie, I have to crank up the system audio to 66% (if the system suddenly plays a system notification sound my hearing is killed), in another movie I am back to my default 28% volume.
We're in the age of AI and smart appliances. If there is a SMART movie player, it will automatically determine the loudness of the video and normalize the volume so it remains consistent audio output.