1213496 - audio changes volume in youtube html5 videos

Status: RESOLVED WORKSFORME

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

Description

[alexios]

User Agent: Mozilla/5.0 (Windows NT 10.0; rv:41.0) Gecko/20100101 Firefox/41.0
Build ID: 20150929144111

Steps to reproduce:

some times when watching videos on youtube, after i pause them for a while (doesn't matter how long) and then restore playback, the volume will be a little bit louder than it was before i pause the video. 



Expected results:

the audio should remain the same no matter what the user does.
except of course when using the volume bar to decrease/increase it.

Comment 1

[Vasilica Tamas, QA [:vtamas]]

I was able to reproduce this issue on Firefox 41.0.2 (20151014143721) and Firefox 44.0a1 (2015-10-14) under Windows 7 64-bit and Ubuntu 14.04 32-bit.

More reliable steps would be:
1.Play a youtube video (eg. https://www.youtube.com/watch?v=cHHLHGNpCSA )
2.Mute the video.
3.Unmute the video.
4.Press “Stop” button.
5.Click “Play” button.

The video volume should to be at maximum, in order to realize easier the volume difference.

But, this issue is also reproducible in Chrome, so I doubt this is a Firefox issue.

Chris, any thoughts about this issue?

Comment 2

[alexios]

could it be a general html5 issue?

Comment 3

[Vasilica Tamas, QA [:vtamas]]

(In reply to alexios from comment #2)
> could it be a general html5 issue?

Yes, it could be. Let's see which will be the Chris answer.

Comment 4

[chlebovnik]

I have a similar issue with html5 videos on YouTube, although my problem is that the volume is LOW. I noticed this when playing music from a playlist. Included screenshots confirm that Firefox eventually starts using or limits the speaker output to 50 % of its capacity.

How it usually goes:

1. The first song is played at full speaker output (10/10 Green Bars)
http://www.upload.ee/image/5273920/FFVolume01.jpg
2. Then the page reloads (loads the next song) and that one is slightly quieter (between 50 to 100 % speaker output 5-10/10 green bars)
http://www.upload.ee/image/5273921/FFVolume02.jpg
3. From 3rd song onward the output is limited to 5/10 Green Bars.
http://www.upload.ee/image/5273922/FFVolume03.jpg

What I have noticed:

Using the seek bar does bump the speaker output back to 10/10, but usually only briefly (until the next song, sometimes the speaker output goes back down to 5/10 even while still playing the current song).

http://www.upload.ee/thumb/5273931/FFVolume04.jpg
(skipped to 2:27 - speaker output jumped back to 10/10, noticeable increase in volume)
http://www.upload.ee/image/5273932/FFVolume05.jpg
(around 2:50 the output dropped back to 5/10, decrease in volume without me doing anything)

I've also found that setting the "media.volume_scale" in about:config to 2.0 (default 1.0) does somewhat fix the issue. It mostly keeps the speaker output at 10/10 (sometimes drops to 9/10), but at a cost of a slight decrease in sound quality.

Comment 5

[alexios]

any update on the issue?

Comment 6

[Ralph Giles (:rillian)]

We think this is a windows issue. There's a setting which adjusts the volume automatically. It's probably getting confused by the mute/unmute. You can try turning the adjustment off.

Comment 7

[alexios]

Attachment: Untitled.png

you mean like the image?

Comment 8

[alexios]

i now noticed at random times the audio will simply disappear and it will return after i refresh the page,pause and resume the playback or click in another point in the video timeline.

could those be related?

Comment 9

[Anthony Jones (:ajones, :kentuckyfriedtakahe, :k17e)]

Attachment: Disable all enhancements.png

Try navigating:

* Start -> Control Panel -> Sound
* Right click on the default speakers and select Properties
* Choose the Enhancements tab
* Select Disable all enhancements

Let me know if that makes a difference.

Comment 10

[alexios]

i only have these options 
http://cdn.makeagif.com/media/11-12-2015/UM8dbS.gif

Comment 11

[chlebovnik]

That solution doesn't work for me. I don't even have the enhancements tab when Realtek drivers are installed. When I uninstalled them (thus reverting to default Microsoft audio drivers) I could disable the enhancements, but the audio issue persisted.

Comment 12

[Anthony Jones (:ajones, :kentuckyfriedtakahe, :k17e)]

(In reply to chlebovnik from comment #11)
> That solution doesn't work for me. I don't even have the enhancements tab
> when Realtek drivers are installed. When I uninstalled them (thus reverting
> to default Microsoft audio drivers) I could disable the enhancements, but
> the audio issue persisted.

Do you get the same issue with other applications?

Comment 13

[chlebovnik]

(In reply to Anthony Jones (:kentuckyfriedtakahe, :k17e) from comment #12)
> (In reply to chlebovnik from comment #11)
> > That solution doesn't work for me. I don't even have the enhancements tab
> > when Realtek drivers are installed. When I uninstalled them (thus reverting
> > to default Microsoft audio drivers) I could disable the enhancements, but
> > the audio issue persisted.
> 
> Do you get the same issue with other applications?

No, just YouTube videos in Firefox. It's fine in Chrome for example.

Comment 14

[alexios]

after the november update of windows 10, i think the issue is not present now.
could it be because of a change in the audio system in the new update?

Comment 15

[Mike Taylor [:miketaylr]]

Gonna close this as WFM, but if you can still reproduce please comment and we can re-open!

Comment 16

[alexios]

actually i haven't encountered the issue for a very long time.
after all, i reverted to 8.1 due to w10 issues.

Comment 17

[alexios]

(In reply to alexios from comment #16)
> actually i haven't encountered the issue for a very long time.
> after all, i reverted to 8.1 due to w10 issues.

*i recently reverted....

Comment 18

[Mike Taylor [:miketaylr]]

Ah, OK. Well, glad it's not happening there!