Should we rely on the TrackConfiguration explainer for code that runs on iOS?

[AfLosada]

Hi!

I've been trying to find out if Track Configuration explainer is reliable for use on Safari for HLS video playback. I've been digging through the code and ended up on the Explainer, and I also see that has been implemented in safari for a couple of years. My questions are:

1. How does the experimental video track configuration calculate the frame_rate and bitrate? I was assumming that it used the #EXT-STREAM-INF, but even when it is correctly set up the Video Track Configuration shows nothing. I've tested with the following videos:
   1. https://stream.mux.com/v69RSHhFelSm4701snP22dYz2jICy4E4FUyk02rW4gxRM.m3u8
   2. https://stream.mux.com/v69RSHhFelSm4701snP22dYz2jICy4E4FUyk02rW4gxRM.m3u8
2. Is there any documentation that explains how to make it work on Safari?