How detect if audio only when playing MP4 HEVC (h265) video files in incompatible browsers?

I'm using a native <video> tag and I've seen that many browsers can't play mp4 videos using hevc/h265 codec:

Currently, as default behavior, uncompatibles browsers (chrome & firefox mainly) just play video with audio only like if everything was ok.. I would like to properly tell users their browser can't play this specific video.

Do you know if there's a way to detect if video is not played correctly (audio only) on frontend side to alert end users?

ps: Reencoding videos to another format is not the question asked there :)

Solution

After some investigation trying to analyse first bytes with mux.js lib, I got this nice hack from github:

const video = document.querySelector('video');

video.addEventListener('loadedmetadata', (event) => {
  if(event.target.videoHeight === 0) {
    console.log('cant play video..');
  }
});

The idea is to check the videoHeight property value after video initialization:

If we have a 'real' value, it means browser is able to read it.
If we have 0, browser can't read it.