Fix paella dual stream layout

[owi92]

Closes #956

Before:

After:

Two unexpected sideeffects:

• The "fullscreen" and "swap" icons somehow changed. Huh? this is desired and simply part of the dynamic layout it appears. Well it can be configured as I understand, but these seem to be the default.
• Default layout is now "Presenter" for some reason. Which is unfortunate. With this, users might think dual stream isn't working. There must be a way to configure that but I couldn't find it yet.

[oas777]

"The "fullscreen" and "swap" icons somehow changed. Huh?"

This is part of the Paella confusion: These are the icons of P7 delivered with the latest Opencast, cf. https://stable.opencast.org/paella7/ui/watch.html?id=ID-dual-stream-demo

Not to be confused with P7 from https://paellaplayer.upv.es/.

Or https://polimediaupv.github.io/paella-ethz/?id=belmar_16_9_hls, which has the latest and greatest design. Or is it https://polimediaupv.github.io/paella-skins/?

[owi92]

@oas777 Yeah I was mostly wondering what's happening "under the hood" there. But if the new icons are the ones you prefer, at least that side effect is a good one, I suppose.

[oas777]

If by "new icons" you mean the ones at https://tobira.opencast.org/events/opencast/2018/vienna/v/P7ha7_AnBU4: No, that's not a good side effect. The ones at https://polimediaupv.github.io/paella-ethz/?id=belmar_16_9_hls or https://polimediaupv.github.io/paella-skins/ are the ones we want.

[owi92]

If by "new icons" you mean the ones at https://tobira.opencast.org/events/opencast/2018/vienna/v/P7ha7_AnBU4

Well no, those are the old ones, also from my perspective. I'm sorry if I didn't convey that correctly. I know that these () are the ones you want, I was just making an offhand comment.
I was surprised that they switched with this PR's code change, which was supposed to be solely about improving space usage of dual stream videos, and isn't merged yet (see https://pr985.tobira.opencast.org/live/events/live-2 for an example).

[LukasKalbertodt]

Default layout is now "Presenter" for some reason. Which is unfortunate. With this, users might think dual stream isn't working. There must be a way to configure that but I couldn't find it yet.

That should certainly be fixed before we merge this. I looked into it a bit and found out a few things that might help you:

• My first assumption was (and maybe yours too) that in your PR, the player starts out in the "single video view" of the "dual stream dynamic layout". But that's incorrect. It actually starts out in the "single stream dynamic layout". If only one video is shown, es.upv.paella.singleVideoDynamic is active.
• So the question is how to make Paella use the es.upv.paella.dualVideoDynamic by default (if applicable). Maybe just moving it up in the configuration already helps?
• I also found this talking about dualVideoContentIds or something. Not sure if it helps.

[owi92]

So there is defaultLayout: "presenter-presentation" which does what you'd expect it to do...
Man how did I miss this.

[LukasKalbertodt]

Man how did I miss this.

Hey, so did I :D And I spend quite some time looking through the docs.

So yeah, seems to work, nice! And the space usage is absolutely improved, another UX win. Regarding the icons: I also don't know why this change causes the icons to change, but since we want these new icons, it's a win. So let's just merge.