1096019 - Some videos freeze when playing with MediaSourceExtensions enabled

Status: RESOLVED WONTFIX

(Core :: Audio/Video, defect)

Description

[Jack W]

User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0
Build ID: 20141107004008

Steps to reproduce:

Watch certain HTML5 videos such as https://www.youtube.com/watch?v=q7vlk2H-BKY with media.mediasource.enabled and media.mediasource.ignore_condecs set to true.
The MIME type of the video is 'video/mp4; codecs="avc1.640028"', and DASH is set to yes (137/140).
This occurs with multiple videos, but not all.


Actual results:

After about 5-10 seconds, the video playback will freeze but the audio will continue to play. "Stats for Nerds" says that the video is still buffering, but the buffer bar no longer continues to increase.
This occurs every time I play the video.
I have reproduced this issue in the aurora and developer branches of firefox (I have no addons in the developer edition, so it's not an addons issue).



Expected results:

The video should play without interruption, like it does in Chrome.

Comment 1

[Matthias Versen [:Matti]]

probably a dupe of bug 1089937

Comment 2

[Jack W]

Interestingly, the video referenced in bug 1089937 works fine for me (up to 1 minute, I didn't watch the whole thing) and appears to be using the VP9 codec.
Also, that bug is regarding audio and video stopping, whereas with this, only the video stops. It's probably still related though, just different symptoms.

Comment 3

[Chris Pearce [:cpearce (Not reading bugmail)]]

Someone on the MSE team should triage this.

Comment 4

[Anthony Jones (:ajones, :kentuckyfriedtakahe, :k17e)]

Set media.mediasource.enabled to false to disable it. This should be the default on 35 so feel free to re-open this bug if it is not disabled by default.