Voiceover not works in Jupyter notebook

[luochen1990]

I'm trying to use manim in Jupyter notebook. To make things reproducible, I use nix to build the environment.

I find that Voiceover is working and the .mp3 files is generated correctly under notes/media/voiceovers, but jupyter notebook can not play all of them, only the first .mp3 sound is played, and others are ignored.

Things get even worse when using vscode jupyter extension, which plays none of the .mp3 files.

Here is what I achieve: https://github.com/luochen1990/manim-jupyter

Anybody can install nix and reproduce my situation use this repo.