1348864 - Black frame displayed on video decoder resume

Status: RESOLVED DUPLICATE of bug 1349883

(Firefox for Android Graveyard :: Audio/Video, defect, P1)

Description

[Bogdan Surd, QA [:bsurd, NI]]

Device2:
 - Nexus 6 (7.0);

Build: 
 - Nightly 55.0a1 (2017-03-20);

Steps to reproduce:
1. Open YouTube and load any video;
2. Switch to another tab and wait for about 60 seconds;
3. After 60 seconds switch back to the previous tab.

Expected result:
 The last video decoded frame should be displayed while video decoder elements resume.

Actual result:
 The last video frame is displayed for about one second and then is followed by a black frame and loading throbbers, or the black frame and the loading throbbers are being displayed as soon as switching back while the video decoder elements resume.

Notes:
 This issue is only reproducible when going back to the video after being away for more than one minute.
 Audio playback works flawlessly and does not pause or interrupt.

Comment 1

[Tzuhao Kuo [:kaku]]

So, after a long debugging phase, I believe that this is an issue of the OOP-decoding on fennec. After talking to :jolin, the behavior is similar to a known issue that the shared buffer is queued in RemoteVideoDecoder so that the the decoding is stopped. Also, if I set the media.android-media-codec.enabled to be false, I am not able to reproduce this issue anymore.

:jolin is going to solve the known fennec issue in Bug 1349883, lets keep an eye on it.  BTW, after applying the WIP patch (Bug 1349883 attachment 8850455 [details]), I cannot reproduce this issue.

Comment 2

[Tzuhao Kuo [:kaku]]

:bogdan, since bug 1349883 has been resolved, could you help to verify this bug?

Comment 3

[Bogdan Surd, QA [:bsurd, NI]]

Hello,

 On slower devices there still seems to be a black frame visible sometimes(intermittent depending on the time the user was on another tab or with the app in the background and the video length), but on higher end ones everything seems to be working perfectly. I will say that this issue is fixed since I don't think it's Firefox related anymore.

Comment 4

[Tzuhao Kuo [:kaku]]

(In reply to Bogdan Surd, QA [:bogdan] from comment #3)
> Hello,
> 
>  On slower devices there still seems to be a black frame visible
> sometimes(intermittent depending on the time the user was on another tab or
> with the app in the background and the video length), but on higher end ones
> everything seems to be working perfectly. I will say that this issue is
> fixed since I don't think it's Firefox related anymore.

Thank you, I will then close this bug. Also, I still want to keep the record that this bug blocks bug 1293963.