Niconico has completely shut down the old video delivery server (DMC) and completely migrated to the new video delivery system called DMS: https://blog.nicovideo.jp/niconews/205042.html
This has resulted in a change in the API specification, which no longer allows normal playback with lavaplayer.
As a reference, yt-dlp has already added support for DMS. I am not very familiar with java, so if you don't mind, please fix it.
(I used DeepL translator.)
Niconico has completely shut down the old video delivery server (DMC) and completely migrated to the new video delivery system called DMS: https://blog.nicovideo.jp/niconews/205042.html
This has resulted in a change in the API specification, which no longer allows normal playback with lavaplayer.
As a reference, yt-dlp has already added support for DMS. I am not very familiar with java, so if you don't mind, please fix it.
(I used DeepL translator.)