1188651 - YouTube video freezes for ~4 seconds at the beginning of the video

Status: RESOLVED DUPLICATE of bug 1180935

(Core :: Audio/Video, defect)

Description

[Mikel]

User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:42.0) Gecko/20100101 Firefox/42.0
Build ID: 20150728030209

Steps to reproduce:

1) Enter the following YouTube video: https://www.youtube.com/watch?v=8uaoBTBofto
2) First second plays fine
3) On the next 4 seconds, the video is freezed (but the audio is OK).
4) Any interaction after that is totally fine

Notes: 
1) Tested on Nightly with e10s enabled.
2) The video quality seems not to be a factor.


Actual results:

The video got freezed for 4 seconds at the beginning of the video.


Expected results:

The video shouldn't have freezed for ~4 seconds at the beginning.

Comment 1

[Mikel]

When media.mediasource.enabled is true, this bug appears.
Set it to false, and no freeze is seen.

Comment 2

[Mikel]

Also, if not able to reproduce, try to reload without cache to reliably reproduce it (Ctrl + R).

Comment 4

[Alice0775 White]

[Tracking Requested - why for this release]: regression since Nightlu42.0a1

Steps to reproduce:
1. Clear Recent History, everything (cache, cookies etc) if any
2. Open https://www.youtube.com/watch?v=8uaoBTBofto

Actual results:
First few seconds of YouTube video are visually distorted

Expected Results:
No distortion.


Setting media.mediasource.format-reader = false helps


Most recent regression window:
https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=706318c7d595&tochange=d3228c82badd

Regressed by:
d3228c82badd	Jean-Yves Avenard — Bug 1171379: P1. Enable MediaSourceDemuxer by default. r=kentuckyfriedtakahe a=bustage


Screen capture: attachment 8640525 [details]
Video Stat : attachment 8640527 [details]

Comment 5

[Alice0775 White]

(In reply to Anthony Hughes, QA Mentor (:ashughes) from comment #3)
> 
> *** This bug has been marked as a duplicate of bug 1180935 ***

Do not duplicate without a evidence.

Comment 6

[Jean-Yves Avenard [:jya]]

It's the exact same video, and depending on which resolution displayed is that same as bug 1180935. Seems evidence enough to me

Comment 7

[Alice0775 White]

this one is https://www.youtube.com/watch?v=8uaoBTBofto
bug 1180935 is https://www.youtube.com/watch?v=q6EoRBvdVPQ

It is a 100 percent different.

Comment 8

[Jean-Yves Avenard [:jya]]

I was referring to https://bugzilla.mozilla.org/show_bug.cgi?id=1180935#c4

Comment 9

[Alice0775 White]

(In reply to Jean-Yves Avenard [:jya] from comment #8)
> I was referring to https://bugzilla.mozilla.org/show_bug.cgi?id=1180935#c4

I see. 
You said bug 1180935 was fixed in bug 1180935 Comment 43.

But, I can still reproduce this problem on Latest Nightly(2015-08-02).
So, this is a definitely different bug.

Comment 10

[Jean-Yves Avenard [:jya]]

This one is very puzzling.

I can see the WMF decoder being fed data properly between 0 and 5.8s
but it only outputs the two keyframes found at t=1s and t=5.33s everything in between (128 frames) are lost

Comment 12

[Kate Glazko]

Untracking because already tracked in duplicate bug 1180935.