I was also able to reproduce this issue. Tested on: - LG G4 (Android 5.1) - Nexus 9 (Android 6.0.1) - Nexus 5 (Android 6.0) Steps to reproduce: 1. Go to youtube.com 2. Load any video 3. Navigate trough the video using the seek control bar. Expected results: The video loads correctly and only one throbber is displayed. Actual results: When navigating using the seek control bar two throbbers are being displayed.

Mass wontfix for bugs affecting firefox 52.

This is a very visible bug that partners are starting to report. Does anyone have any ideas? Has it always been this way?

snorp, is there someone who looks at fennec-specific media stuff? (this doesn't repro on desktop if i send a mobile UA)

I've seen the two throbbers for a long time. I'd guess one is content, and the other is our own? Anthony, do you know what could be happening? Blake, if your team has some time for this that would be helpful.

AFAIK, the second spinner comes from our videocontrol. Tim and Ray, May we have your help to check it?

(In reply to James Willcox (:snorp) (jwillcox@mozilla.com) from comment #7) > I've seen the two throbbers for a long time. I'd guess one is content, and the other is our own? Yes, I think that's what causes this case. (In reply to Blake Wu [:bwu][:blakewu] from comment #8) > AFAIK, the second spinner comes from our videocontrol. If the first spinner comes out from content itself, then I don't think we could have a straight fix to this as we could not detect what's over <video> in video controls.

Hi Anthony, Do you have any idea to mitigate this issue? I don't think we could hide our spinner for just YouTube, but look bad on other websites. Thanks.

Do we know what Chrome does?

(In reply to Mike Kaply [:mkaply] from comment #11) > Do we know what Chrome does? I didn't look into the implementation details of Chrome, but it appears that Chrome doesn't show something like spinner while loading. So, in this case, one spinner look sensible on Chrome.

So maybe we shouldn't be showing a spinner ourselves? And relying on content?

That would be something :alam needs to answer. Thanks Ray.

Yeah, this is a bit weird. Our spinner seems unnecessary. It seems like most videos on the web have a UI to handle this type of "things are loading" feedback themselves. Does anyone know why we still show our own spinner? Snorp is there a history lesson here?

Yeah I don't know what the story is here. My guess is that we wanted something for when you're playing a raw video directly (not embedded in a page)? In any case, killing the spinner seems ok to me.

+1

Comment on attachment 8860803 [details] Bug 1289412 - Remove throbber/spinner from mobile video element. https://reviewboard.mozilla.org/r/132774/#review135700

It looks like a very simple change, should we uplift?

(In reply to Marco Castelluccio [:marco] from comment #20) > It looks like a very simple change, should we uplift? Yes, please. Partners have reported this.

Pushed by cbook@mozilla.com: https://hg.mozilla.org/integration/autoland/rev/9b5e7f9f2816 Remove throbber/spinner from mobile video element. r=sebastian

Let's get it verified before request for uplift.

Devices: - Nexus 6 (Android 7.0); - Honor 8 (Android 6.0). Build: 55.0a1 (05-01-2017).

Comment on attachment 8860803 [details] Bug 1289412 - Remove throbber/spinner from mobile video element. Approval Request Comment [Feature/Bug causing the regression]: Feature [User impact if declined]: As described in STR [Is this code covered by automated tests?]: [Has the fix been verified in Nightly?]: Yes [Needs manual test from QE? If yes, steps to reproduce]: No [List of other uplifts needed for the feature/fix]: Just this bug. [Is the change risky?]: No. [Why is the change risky/not risky?]: Remove an UI, instead of adding an feature. [String changes made/needed]: No.

Comment on attachment 8860803 [details] Bug 1289412 - Remove throbber/spinner from mobile video element. Fix two loading throbbers shown issue and was verified. Beta54+. Should be in 54 beta 6 for mobile.

Verified as fixed on Beta 54.0b6. Devices: -HTC 10 (Android 6.0.1) -Huawei Honor 5X (Android 5.1.1) -Prestigio Grace X5 (Android 4.4.2)