isn't the basic usage example exactly that?

isn't the basic usage example exactly that?

I have tested that the synthesized video can be played in the video tag. If it is downloaded to the hard disk and played using the local player, the sound is out of sync with the video.
It seems that this library is only for playing video in the browser. It cannot composite video for local playback.

It should be possible to download the resolution fmp4, and I'd expect it to play back the same as on the web.
also, this module provides a binary that can help transmux ts to mp4 https://github.com/videojs/mux.js/blob/main/bin/transmux.js https://github.com/videojs/mux.js/blob/main/package.json#L13

there may be some inconsistencies with the timing data of the video and audio of your source. you can try changing the keepOriginalTimestamps option. or your "local player" may just be bad, since you don't say what it is.
its a bit of a pity the library doesn't offer more control over or at least documentation/explanation about the timing data, but it works ok at least for the basic cases.

same issue😭