1127806 - [gUM] Blank window area when paused using only 'Pause/Play' button

Status: RESOLVED INVALID

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

Description

[Bogdan Maris, Desktop Test Engineering]

Reproducible with builds:
- Firefox 36 beta 5
- Firefox Aurora (latest)
- Firefox Nightly (latest;e10s and non e10s)

Reproducible on OS`s:
- Ubuntu 14.04 32-bit
- Windows 7 64-bit
- Mac OS X 10.9.5

STR:
1. Open latest Nightly
2. Visit https://people.mozilla.org/~fqueze2/webrtc/
3. Start Video, Window, Screen or Application
4. Click Share selected devices
5. Click the Pause/Play button

Expected results: After the video is paused the image remains paused.

Actual results: If the video is paused using the 'Pause/Play' button video area goes blank. Pausing the video in any other way will still display the image but will be frozen. 

Notes:
1. Not a regression, reproduces back to Nightly from 2013-10-31.
2. Reproducible on Ubuntu 14.04 32-bit, Windows 7 64-bit, Mac OS X 10.9.5.
3. Statistics:

When video is paused via 'Pause/Play'
Media: (no source found)
Size: 0x0 scaled to 640x480
Activity: Paused
Volume: 100%
readyState: HAVE_NOTHING
networkState: NETWORK_EMPTY
Frames parsed: 0
Frames decoded: 0
Frames presented: 0
Frames painted 0


When video is paused any other way (context menu)
Media: (no source found)
Size: 640x480
Activity: Paused
Volume: 100%
readyState: HAVE_CURRENT_DATA
networkState: NETWORK_IDLE
Frames parsed: 0
Frames decoded: 0
Frames presented: 0
Frames painted 2453

Comment 1

[Nils Ohlmeier [:drno]]

Sorry but this is not a bug in Firefox, but apparently intention by the author of the web page, because in pauseMedia() the mozSrcObject get set to null. So Firefox has nothing to render anymore. If you comment out the null lines you will see the frozen picture like you expect.

Comment 2

[Florian Quèze [:florian]]

(In reply to Nils Ohlmeier [:drno] from comment #1)
> Sorry but this is not a bug in Firefox, but apparently intention by the
> author of the web page, because in pauseMedia() the mozSrcObject get set to
> null. So Firefox has nothing to render anymore. If you comment out the null
> lines you will see the frozen picture like you expect.

Bogdan, sorry for not checking the source code of the test page before telling you this was an inconsistent behavior in Firefox :-/.