1196726 - Air Mozilla videos (JW Player) won't play with autoplay disabled

Status: RESOLVED WORKSFORME

(Core :: Audio/Video: Playback, defect, P5)

Description

[Stefan Plewako [:stef]]

If media.autoplay.enabled is set to false, videos on https://air.mozilla.org cease to start playing (after clicking play button spinner is shown forever).

Comment 1

[Peter Bengtsson [:peterbe]]

This might very well be a JWPlayer bug. Or are you talking about a live video? 
We actually don't want archived videos to autoplay. But for live streams we do. 

I'm not super familiar with it but I can only imagine that media.autoplay.enabled is related to the built-in video player in the browser. We're actually not using that. We're using a javascript player that wraps the very very basic video player in the browser.

Comment 2

[Stefan Plewako [:stef]]

It is about archived videos and JWPlayer being depended on media.autoplay.enabled set to true (could be seen as bug in JWPlayer). Could be tested easily on https://air.mozilla.org/tracking-protection-for-firefox/

Comment 3

[Peter Bengtsson [:peterbe]]

So, do you think we should raise this with JWPlayer?

Comment 4

[Stefan Plewako [:stef]]

I don't know much about airmo or jwplayer but yes, that sounds like a way to fix that.

Comment 5

[Peter Bengtsson [:peterbe]]

I'll file a bug with JWPlayer

Comment 6

[Adam]

This is likely related to bug 1173848, and not (just?) a JWPlayer bug.

Comment 7

[Chris Peterson [:cpeterson]]

As hobophobe points out, this bug also affects the YouTube player so it is probably a Firefox bug. I suspect it's a regression from bug 659285. Let's move this bug to the Core::Audio/Video Playback component to be triaged.

Comment 8

[Ralph Giles (:rillian)]

Sounds like the player sync problems we've seen with youtube player and onscreen controls too.

Unless jwplayer is just assuming autoplay works without checking for playback start.

Comment 9

[Cameron McCormack (:heycam)]

Can you try changing this line:

  https://dxr.mozilla.org/mozilla-central/rev/f2518b8a7b97b5bb477e94bc9131584007aac887/layout/style/nsCSSRuleProcessor.cpp#2849

to:

  return eRestyle_Subtree;

If that fixes the problem, then this is a dupe of bug 1192302 (regression from bug 1180118).

Comment 10

[Stefan Plewako [:stef]]

I might have found workaround for this ugly player - if you push video to be full screen (double click on video or use player icon) then video playback starts…

Comment 11

[Cameron McCormack (:heycam)]

(In reply to Cameron McCormack (:heycam) from comment #9)
> If that fixes the problem, then this is a dupe of bug 1192302 (regression
> from bug 1180118).

I've tested, and this bug is not the cause.

Comment 12

[Sam Harper]

I am seeing this issue using Firefox 64-bit beta 42.0b1, when browsing news stories at http://www.msn.com/en-us/money, where the video is typically at the start of the story. Setting media.autoplay.enabled to false is my only change to about:config.

Stefan's workaround (comment 10) does not work for me, because the video controls appear to be locked, and so I cannot switch to full screen when autoplay is disabled.

Comment 13

[Hubert Figuiere [:hub]]

When bug 1244768 is implemented this should be easier to fix *upstream*.

See also bug 1173848 for the Youtube player.