1337704 - Flickery transition between tabs indicators (play tab -> sound)

Status: RESOLVED WONTFIX

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

Description

[Simona Badau, Desktop QA]

Attachment: SoundIndicatorFlicker.mp4

[Affected versions]:
- Nightly 54.0a1 - build ID: 20170207030214

[Affected platforms]:
- Windows 10, Ubuntu 16.04 and Mac OS X 10.11

[Steps to reproduce]:
1. Launch Firefox
2. Navigate to YouTube
3. Open 10 videos in the background
4. After all the videos are loaded,focus them one by one (pay attention to the tabs indicators)


[Expected result]:
- Sound indicator replaces the Play Tab indicator in a smooth transition.

[Actual result]:
- Sound indicator flickers right after replacing the Play Tab indicator. For more details please see the attached screen cast that contains a comparison between the transition of the tab indicators on Nightly 53 and Nightly 54.

Comment 1

[Alastor Wu [:alwu]]

It's known issue, but now I don't have any way to fix it, and it's a "trade off" from bug1328058.

Before that bug, we would pre-set the sound icon before the "play tab" icon disappear. However, in that bug, we got the situation is the video might be silent, so that we shouldn't show the sound icon immediately, we should wait the video decoding to know whether the video is silent or not. That needs some time, so we would get some little latency between "hide play tab" and "show sound icon", and cause the flickery.

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I would mark this bug as WONTFIX.