Bug in HLS PLayer of Paella

[Stephan Krinetzki]

Hi everyone,

Since the last upgrade (Opencast 9.x to 10.9) we have been experiencing problems with users not being able to play videos via the Paella Player. This especially affects users who are either abroad or generally have a poor internet connection. When loading the page, the loading animation starts, but the video is not played.

The whole thing can be reproduced as follows:

1. Go to https://paellaplayer.upv.es/demos/multi-quality-hls/
2. Open the browser developer tools
3. Enable throttling at "Fast 3G" (Chrome) or "Regular 3G" (Firefox)
4. Reload page
5. Click video

The same can be tested with Opencast: https://stable.opencast.org/paella/ui/watch.html?id=ID-3d-print

An issue has already been opened at Paella: https://github.com/polimediaupv/paella/issues/826

I just wanted to find out if other users have the problem too. If not, what is set differently in your case. As media server we use the Wowza streaming engine, maybe something has to be adjusted there as well.

Regards

Stephan

[Carlos Turro Ribalta]

Hi Stephan

 

Thanks for the info. I see the issue and we are going to look into it

 

Carlos

--
To unsubscribe from this group and stop receiving emails from it, send an email to users+un...@opencast.org.

[crei...@uni-koeln.de]

Hi Stephan, hi Carlos,

we experienced the same issue while testing newer versions of paella (above version 6.5.2 if I remember correctly). We set /Root/Application/HTTPStreamer cupertinoChunkDurationTarget Integer 6000 (which is apples recommentdation) in our Wowza application to shrink the size of the individual chunks in the playlist.m3u8 which helps. The underlying issue seems to be though, that the chunkloading isn't fast enough on slower connections for newer versions of paella. Even a higher than normal latency of around 200ms was enough to stall paella.

kind regards
Christoph

On 17.02.22 15:37, Carlos Turro Ribalta <tu...@cc.upv.es> wrote:
> Hi Stephan
>
> Thanks for the info. I see the issue and we are going to look into it
>
> Carlos
>

> *De:* us...@opencast.org <us...@opencast.org> *En nombre de *Stephan
> Krinetzki
> *Enviado el:* jueves, 17 de febrero de 2022 8:48
> *Para:* Opencast Users <us...@opencast.org>
> *Asunto:* [OC Users] Bug in HLS PLayer of Paella

>
> Hi everyone,
>
> Since the last upgrade (Opencast 9.x to 10.9) we have been experiencing
> problems with users not being able to play videos via the Paella Player.
> This especially affects users who are either abroad or generally have a
> poor internet connection. When loading the page, the loading animation
> starts, but the video is not played.
>
> The whole thing can be reproduced as follows:
>

> 1. Go to https://paellaplayer.upv.es/demos/multi-quality-hls/
> <https://paellaplayer.upv.es/demos/multi-quality-hls/>
> 2. Open the browser developer tools
> 3. Enable throttling at "Fast 3G" (Chrome) or "Regular 3G" (Firefox)
> 4. Reload page
> 5. Click video

>
> The same can be tested with Opencast:
> https://stable.opencast.org/paella/ui/watch.html?id=ID-3d-print
> <https://stable.opencast.org/paella/ui/watch.html?id=ID-3d-print>
>
> An issue has already been opened at Paella:
> https://github.com/polimediaupv/paella/issues/826
> <https://github.com/polimediaupv/paella/issues/826>
>
> I just wanted to find out if other users have the problem too. If not,
> what is set differently in your case. As media server we use the Wowza
> streaming engine, maybe something has to be adjusted there as well.
>
> Regards
>
> Stephan
>
> --
> To unsubscribe from this group and stop receiving emails from it, send
> an email to users+un...@opencast.org

> <mailto:users+un...@opencast.org>.

>
> --
> To unsubscribe from this group and stop receiving emails from it, send
> an email to users+un...@opencast.org

> <mailto:users+un...@opencast.org>.
>

[Stephan Krinetzki]

Hi Christoph, Hi Carlos,

thanks for the input so far. The issue itself is now tracked under https://github.com/polimediaupv/paella/issues/826 so it is a Paella Player bug.

We have now set

/Root/Application/HTTPStreamer cupertinoChunkDurationTarget Integer 6000

in Wowza and waiting and analyzing the error in Paella Player.