Use ExoPlayer default values for buffers

[Redirion]

What is it?

• Bugfix (user facing)
• Feature (user facing)
• Codebase improvement (dev facing)
• Meta improvement to the project (dev facing)

Description of the changes in your PR

ExoPlayer 2.12 noted this in the changelog:
Set the default minimum buffer duration in DefaultLoadControl to 50 seconds (equal to the default maximum buffer), and treat audio and video the same.

Maybe there was a reason they decided to have both minimum and maximum buffer identical since 2.12. NewPipe used years old constants which are now removed in favor of ExoPlayer constants so that future versions will keep up with what changes at ExoPlayer.

Fixes the following issue(s)

Hopefully fixes some of the buffer issues we have lately like #6510

APK testing

On the website the APK can be found by going to the "Checks" tab below the title and then on "artifacts" on the right.

Due diligence

• I read the contribution guidelines.

[opusforlife2]

It does seem like this solves the issue.

In fact, it seems to have taken Newpipe back to the old behaviour, where it keeps buffering the video endlessly, unless you rewind or fast forward (may not work), or change the resolution (usually works).

Edit: Ah. Got a couple of "Could not play this stream" as well. This, too, was the old behaviour.

Regardless of these old issues with buffering, I would consider the "repeated rebuffering" bug solved.

[tsiflimagas]

@opusforlife2 I got the same error too, without this commit, so maybe it's not related to it.

[litetex]

Is this pull request anymore required?

The exact problem was found and we got #6673 that hopefully fixes it 😄

[XiangRongLin]

Unless there are good reasons to deviate from the default values, I would still merge this. The guys from exoplayer probably put more thought into those values than we.

[tsiflimagas]

Is this good to merge? I've used it for some days now and seems fine (not that I actually noticed some difference).

[TobiGr]

Looks good to me. I did not ran into any issues while testing.