1125842 - Toggling "media.mediasource.webm.enabled" pref will not change Mime Type and DASH.

Status: RESOLVED INVALID

(Core :: Audio/Video: Playback, defect)

Description

[Teodora Vermesan (:TeoVermesan)]

Tested with:
Firefox 36 Beta 3
Mozilla/5.0 (X11; Linux x86_64; rv:36.0) Gecko/20100101 Firefox/36.0
build id:20150122214638

Steps to reproduce:
1. Open about:config and search for "media.mediasource.webm.enabled" (the pref is TRUE by default)
2. Go to a video from youtube
3. Open "Stats for nerds" and see what displays for "Mime Type" and "DASH" 
4. Go to about:config and change "media.mediasource.webm.enabled" from TRUE to FALSE
5. Go back to a video from youtube and open "Stats for nerds" and look for "Mime Type" and "DASH"

Issue:
- Switching pref "media.mediasource.webm.enabled" seems to have no effect: Mime Type and DASH will remain the same:
Mime Type: video/mp4; codecs="avc1.42001E,mp4a.40.2"
DASH: no (18)

Note:
- I was able to reproduce this issue only on Ubuntu 12.04 64 bit
- on latest Nightly (2015-01-26) toggling the pref will also change Mime Type and DASH:
media.mediasource.webm.enabled = true by default
Mime Type: video/webm; codes="vp9"
DASH: yes (243/171)

media.mediasource.webm.enabled = false
Mime Type: video/mp4; codecs="avc1.42001E, mp4a.40.2"
DASH: no (18)

Comment 1

[Teodora Vermesan (:TeoVermesan)]

Graphics:
Adapter Description: Tungsten Graphics, Inc -- Mesa DRI Intel(R) Ivybridge Desktop
Device ID:Mesa DRI Intel(R) Ivybridge Desktop
Driver Version: 3.0 Mesa 8.0.4
GPU Accelerated Windows: 0/2 Basic (OMTC)
Vendor ID: Tungsten Graphics, Inc
WebGL Renderer: Tungsten Graphics, Inc -- Mesa DRI Intel(R) Ivybridge Desktop
windowLayerManagerRemote: true
AzureCanvasBackend: cairo
AzureContentBackend: cairo
AzureFallbackCanvasBackend: none
AzureSkiaAccelerated: 0

Comment 2

[crschmidt]

In order to play H.264 DASH videos, you need to have support for extended profiles (4d/77); The openh264 plugin doesn't provide this support, based on news articles I can find on the web, so I think this is working as intended unless you have picked up H.264 support from some other source that does support extended profiles.

Comment 3

[crschmidt]

Hm, contrary to my previous comment, I *am* getting H.264 DASH support in FF37, so maybe this is something that is being worked on. If you go to youtube.com/html5, does it show "H.264+MSE" as red or green?

Comment 4

[Teodora Vermesan (:TeoVermesan)]

Attachment: Screenshot from 2015-02-23 10:59:39.png

I have installed Firefox 36 Beta 3 and went to youtube.com/html5 and "MSE & H.264" is red.

Comment 5

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

STR don't mention pressing refresh which is the important step. This issue no longer exists anyhow.