1080383 - audio file skips to end

Status: RESOLVED WORKSFORME

(Core :: Audio/Video, defect)

Description

[pieter-jan.speelmans]

Attachment: 1.mp4

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:32.0) Gecko/20100101 Firefox/32.0
Build ID: 20140923175406

Steps to reproduce:

 - Open a new Firefox tab.
 - Open a page with the attached audio file in the src attribute.
 - Pres play: the file skips to the end.
 - Pres play again: the file starts playing, but plays for 29 seconds.



Actual results:

Playing gives timeupdates at an enhanced rate. After about 0.2s, the element reports it is ended and is at a timestamp of 7.2s and dispatches an "ended" event.
The second time, the file plays too long.


Expected results:

The audio file should have played. After about 4 seconds, there is a thunder noise.

Comment 1

[pieter-jan.speelmans]

Note:
Other browsers (IE, Chrome) don't have a problem with this file. Also tested in Firefox 33 beta. The same issue occurs.

Comment 2

[Loic]

Probably because it's a MP4 audio in VBR mode.

Anyway your issue is fixed in FF34+ by bug 1057879:
Working range: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=dc352a7bf234&tochange=0753f7b93ab7
Setting media.fragmented-mp4.exposed=false (true is default) in Aurora & Nightly makes the bug reproducible.

But, there is another remaining issue, I filed bug 1080435.