It will be a good piece of information for you to know that, when you stream a video on YouTube, the audio and video part stream separately. If you change the video quality from 144p to 720p or to any other resolution, the audio bitrate won’t be affected.
YouTube sees the device on which you are streaming a video, and then stream both elements according to its connection.
Usually, the audio that you hear on YouTube videos is 126 kbps AAC, in an MP4 container. If it is a WebM container, then the audio quality would be 50-165 kbps Opus. And having simple YouTube Audio Downloader and make it easy too.
Most people download YouTube videos for offline viewing, for when they don’t have access to an internet connection. In this case, they want to make sure that they download the best video resolution for their video and the audio quality is satisfying as well.
If none of these things are up to the mark, then they won’t be able to enjoy offline viewing of their YouTube downloads.
YouTube didn’t have separate streams for video and audio, before 2013. The bitrate of the audio was selected, with respect to the video’s resolution. For example, if a video’s resolution was 240p, then the audio would be of 64kbps MP3.
You have the authority to change the audio quality of the video that you are viewing. To change the quality, follow the steps discussed below:
  • First, go to your YouTube music app, and then tap on your profile picture
  • Choose the Setting option and then Library & Downloads
  • Tap on Audio Quality
You have three options for audio quality now. If you want to choose low quality audio, then it will use less storage on your device. Low quality audio would be bitrate 48kbps AAC.
If you choose normal audio, then that won’t impact the storage on your device. In fact, in many devices, the default settings of audio quality is normal quality. The bitrate of normal is 128kbps AAC.

If you choose a high quality for your download, then it will take up more space on your device. The bitrate for a high quality audio is 256kbps AAC.
Note that these new audio settings will only impact the future downloads and not the current ones. It is, nevertheless, good to know about such technical information, in case you want to change the audio quality of YouTube videos, to get a better understanding of what it is about.