Undocumented / inconsistent cross-browser values for percent and duration when streaming

[acoulton]

Expected Behavior

That there should be some consistent way to identify during playback that the viewer is watching a livestream rather than an on-demand video.

I note that https://developer.vimeo.com/player/sdk/reference#timeupdate does not document what these values should / might be for a livestream but I would have expected them to have some defined behaviour.

Actual Behavior

When viewing a livestream, the timeupdate event gives different percent and duration values depending on the browser.

Browser	seconds	duration	percent
Current Chrome, Edge, Firefox	time elapsed since start of stream	Infinity (the JS constant)	0
Safari 15 (possibly others)	" " "	47721.859	{seconds} / {duration}

The value 47721.859 doesn't appear to correlate to anything in the event setup / schedule, as far as I can see it is just a consistent but arbitrary number.

Steps to Reproduce

During a livestream:

player.on(
   'timeupdate',
  ({seconds, percent, duration}) => console.log(seconds, percent, duration)
);

Observe that the values reported to the console are as above.