Reloads songs on YouTube Music using the regular YouTube video backend to force playback with the Opus audio codec, since desktop YouTube Music seems to be unable to play in Opus codec always defaults to AAC. This also bypasses YouTube Music's quality restriction for non-premium users.
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Opus is widely regarded as the more modern and better-optimized codec, especially in streaming applications. Its advantages are most noticeable at lower bitrates—such as YouTube Music’s “Normal” and “Low” quality settings—where its superior efficiency and audio preservation clearly outperform AAC. At the “High” quality setting (~256 kbps), Opus still offers theoretical benefits, such as better transient handling and fewer artifacts. However, at this bitrate, the difference becomes much more subtle and may only be perceptible to listeners with better audio equipment and know what they are listening for.
There is only one small downside that this script introduces. It introduces a small pause when switching between video and audio only mode. This is because each time that happens the music player loads the AAC version of the audio and the script needs to reload it to force Opus to be used.
I hope the day comes that YouTube Music on desktop get's fixed. It is comepletely ridiculous that YouTube VIDEO offers better audio quality than their service that is dedicated to music.