It's probably due to the unusual sound format, 24kHz mono PCM, and the fact that it was somehow forced into a WebM container, which only supports Vorbis and Opus officially.

It looks like the author created it using the "higher quality" ffmpeg command line, except for the "webm" final extension, producing the opposite of what's described as "an MP4 file that's compatible with more devices".

https://github.com/denizsafak/abogen/tree/main/demo#for-high...

Yeah, I've run a local Kokoro instance, and it doesn't work with Firefox. This uses Kokoro under the hood.

Same here, but it worked when I opened it in Chrome. What a weird error - you would think that playing an embedded mp4 with audio wouldn't differ from browser to browser.

Thanks for this. I thought I had some local issue with waterfox. Pasting the (long) video URL to the terminal let's mpv play it with audio.

Same on my end, no audio in the video.

I can hear it on safari