Ability to download livestreams before they become private right after those livestreams have finished broadcasting

[sebma]

Checklist

• I checked, but didn't find any duplicates (open OR closed) of this issue in the repo.
• I have read the contribution guidelines given at https://github.com/TeamNewPipe/NewPipe/blob/HEAD/.github/CONTRIBUTING.md.
• This issue contains only one feature request. I will open one issue for every feature I want to request.

Describe the feature you want

I'd love to be able to download some youtube specific livestreams :
Those livestreams switch from public to private right after they have finished live broadcasting.

Is your feature request related to a problem? Please describe it

Additional context

How will you/everyone benefit from this feature?

First of all, let me thank you for this great application and the work you have done so far 👍
Right after some livestreams have finished live broadcasting, they switch from public to private. Therefore I cannot view them anymore after that. It would be really great if you implemented this feature.
God bless you !

[triallax]

I have my doubts as to the possibility of adding this feature, but nevertheless, nice idea!

[CBSkarmory]

Regarding the technical feasibility of this, there is a period of time after the stream ends during which you can open it again in NewPipe and replay (jump to any section) it, though it is still marked LIVE (instead of having a duration). Based on this, I would guess that it is technically possible.
(During the stream, the video progress bar indicates something a few seconds long with LIVE at the right-hand-side (RHS); however, during this time period, the progress bar indicates the full length with LIVE at the RHS and allows seeking).

comment discussing encoding of livestreams: #1239 (comment)

additional finding: #6989 <- during this phase, this bug does not occur, suggesting that it already goes through some other code path.