Closed Bug 1034081 Opened 6 years ago Closed 4 years ago

VP9 sample video skips the first 5 seconds of content


(Core :: Audio/Video, defect)

29 Branch
Windows 8.1
Not set



Tracking Status
firefox41 --- verified
firefox42 --- verified


(Reporter: Fanolian+BMO, Assigned: j)



(Keywords: regression)


(1 file)

User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:33.0) Gecko/20100101 Firefox/33.0 (Beta/Release)
Build ID: 20140703030200

Steps to reproduce:

Open found in bug 833023#30.

Actual results:

1. On first playback, seek bar goes all to the right.
2. Subsequent playback skips the first 5 seconds of content.

Expected results:

No skipping of content.

regression range for problem 2:
Last good revision: 12ea03a70243 (2013-12-11)
First bad revision: 1ad9af3a2ab8 (2013-12-12)
Blocks: 949525
Keywords: regression
The first Nightly that observes issue 1 (seek bar problem) is 2012-12-03 build (rev 8648aa476eef) which predates VP9 implementation. vp9cake.webm plays with audio only on this build and the seek bar goes all to the right. Prior to this Nightly the file cannot be played at all.

Something forgot to mention in original post:
In current Nightly, if I save vp9cake.webm locally and play it in Nightly again, problem 1 is gone but problem 2 persists.
The problem 2 seems to be caused by Bug 945863
Blocks: 945863
Ever confirmed: true
Flags: needinfo?(j)
Assignee: nobody → j
Flags: needinfo?(j)
Attachment #8633454 - Flags: review?(giles)
Duplicate of this bug: 1182821
Attachment #8633454 - Flags: review?(giles) → review+
any chance to land this and possibly also push to stable branches?
Flags: needinfo?(giles)
Leaving myself on needinfo to see about uplifting to aurora later this week.
Closed: 4 years ago
Resolution: --- → FIXED
Target Milestone: --- → mozilla42
Comment on attachment 8633454 [details] [diff] [review]

Approval Request Comment
[Feature/regressing bug #]: Bug 945863
[User impact if declined]: Some videos fail to start
[Describe test coverage new/current, TreeHerder]: Landed on nightly last week, passing playback mochitests.
[Risks and why]: I believe risk is acceptable. This codepath doesn't get a huge amount of use, but it's an annoying bug for people who are using WebM with HTML5 video. Rest of the code hasn't changed lately, so chance of side-effect is small and backout in case of regression would be easy.
[String/UUID change made/needed]: None.
Flags: needinfo?(giles)
Attachment #8633454 - Flags: approval-mozilla-aurora?
Comment on attachment 8633454 [details] [diff] [review]

This code has been in m-c for a few days and existing mochitests pass. Let's land it on Aurora channel.
Attachment #8633454 - Flags: approval-mozilla-aurora? → approval-mozilla-aurora+
QA Whiteboard: [good first verify]
I have successfully reproduced the bug in firefox Nightly 33.0a1 (2014-07-03) with windows 10 PRO N (64 bit) 

Verified as fixed with 43.0a1 as comment 0

Build ID:   20150821030204
Mozilla/5.0 (Windows NT 10.0; WOW64; rv:43.0) Gecko/20100101 Firefox/43.0

Reproduced this bug with Nightly 33.0a1 (2014-07-03) by following comment 0 on Linux x64

This Bug is now verified as fixed on Latest Firefox Nightly 43.0a1 (2015-08-27) (Build ID: 20150827030213) and Latest Firefox Aurora 42.0a2 (2015-08-27) (Build ID: 20150827004003)

Mozilla/5.0 (X11; Linux x86_64; rv:43.0) Gecko/20100101 Firefox/43.0
Mozilla/5.0 (X11; Linux x86_64; rv:42.0) Gecko/20100101 Firefox/42.0

As it is also verified on Windows (Comment 12), Marking it as verified!
QA Whiteboard: [good first verify] → [good first verify][bugday-20150826]
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