Paella Player with buffered live streams

[ferishili]

This PR fixes #219,

Description

With current paella-core version, it is not possible to provide the progress bar and play/pause button during live streams, as it ends up in some sort of error that breaks everything!
Therefore, it was technically impossible to provide such feature at the time.

Solution

• The described problem was solved in paella-core v1.46.1, therefore we had to upgrade the whole paella package.
• Apart from that, as there are also institutions that their live stream system does not have this capability, we decided to provide a toggle mechanism as well.
  • under plugin configs > Settings > Events > Live Streams, there is now a new option called Buffered Livestreams for this matter, and by enabling it everything will take place automatically. (you don't need to worry about anything else!)
• a new theme is also introduced called js/opencast/src/Paella/default_theme/opencast_live_buffered_theme.json that contains the paella player config required to provide progress bar, play button etc. -> (Any custom config changes about this, must be added in this file as it gets loaded when that option is enabled.)
• A bonus for developers: test_paella_livestream.html has been improved in a way that you could select the configs and enter custom urls on the same page.

[reiferschris]

Thanks, both cases work with our setup.

The buffered stream in our setup is of course limited to the part of the livestream you watched and if you watch with a delay you might miss the end, because you don't get the newest chunks anymore. But that isn't the plugins fault.

[snoesberger]

Unfortunately, in our setup, I can't play the live streams any more, instead of the Paella player, I get the message "The Live Event has been paused or prematurely terminated". In Opencast, the same livestream works fine.

Configured settings:

• Streaming Type: HLS (.m3u8 / .m3u)
• Buffered Livestreams: tested both "checked"

@ferishili let me know if you need some more information.

[snoesberger]

Unfortunately, in our setup, I can't play the live streams any more, instead of the Paella player, I get the message "The Live Event has been paused or prematurely terminated". In Opencast, the same livestream works fine.

I have just been able to solve the problem with the help of @ferishili. It was a misunderstanding of the configuration parameter "Streaming Type" on my side with a combination of the used player configuration. We use HLS with MPEG-TS files for our livestreaming, so "HLS (.m3u8 / .m3u)" is not the right setting, but "MPEG-TS".

Everything is now working fine. The progress bar is displayed and I'm able to go backwards and forwards in time. Pause/Play also works.