Fixes for serverless HLS

[marwyg]

I made my own PR, I hope that's okay. The original draft is here: #627
This PR contains the actual changes from @luniki + changes after review from @JulianKniephoff. The review is also to be found here: #627.

The 3 points Julian made:

1. Integrating the sort into the sorting below. I did that and it works. (Fixes for serverless HLS #627 (comment))
2. Is it possible to remove renderers: ["html5", "native_hls"]completly?: Yes, I removed it and it works. (Fixes for serverless HLS #627 (comment))
3. I didn't see a case where the duration was infinity, but that doesn't mean that Marcus didn't see something. I testet a small javascript function to see, how !isFinite and isNaN differs from each other:

function compareIsNaNAndIsFinite() {
  const testValues = [NaN, "hello", undefined, "123", 123, Infinity, -Infinity, null, true, false, ""];

  console.log("Value\t\tisNaN(value)\t!isFinite(value)");
  console.log("------------------------------------------------");
  testValues.forEach(value => {
    console.log(
      `${String(value).padEnd(10)}\t${isNaN(value)}\t\t${!isFinite(value)}`
    );
  });
}

compareIsNaNAndIsFinite();

The result:

Value		isNaN(value)	!isFinite(value)
------------------------------------------------
NaN       	true		true
hello     	true		true
undefined 	true		true
123       	false		false
123       	false		false
Infinity  	false		true
-Infinity 	false		true
null      	false		false
true      	false		false
false     	false		false
          	false		false

So I think, it's okay to use !isFinite() instead, because it can handle one more case, but behaves the same in the other cases.

I added another small line from Marcus, where he triggers an update for the video duration. It was reported, that the time wasn't displayed correctly.

[marwyg]

I tested this with the master and the stable branch.