1298031 - [W10] WebM is not being used via the 'Stats for nerds' on YouTube

Status: RESOLVED INVALID

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

Description

[Ciprian Georgiu, Desktop QA]

Attachment: Widevine YouTube codec.jpg

[Note]:
- see screenshot

[Affected versions]:
- latest Aurora 50.0a2

[Affected platforms]:
- Windows 10 x86

[Steps to reproduce]:
1. Start Firefox.
2. Go to: https://www.youtube.com/watch?v=W6E7CGm12tA&feature=youtu.be.
3. Pay video.
4. Right click on the video and select option 'Stats for nerds'.

[Expected result]:
- The 'Mime Type' data is showing 'video/webm' with vp8 or vp9 codec.

[Actual result]:
- The 'Mime Type' data is showing 'video/mp4' with 'avc1.4d401e' codec.

[Regression range]:
- This is not a regression.

[Additional notes]:
- I was able to reproduce this issue only on HP ProBook 470 G3 (Intel HD Graphics 520 - Skylake GT) running Windows 10 x86. The issue is not reproducible on the same machine with Windows 10 x64.

- Also on one of our test machines with Windows 10 x86, FX50 does not seem to be affected.
          - the YouTube paid content link provided in STR is free ($0.00), though it will require to enter your credit card information.

Comment 1

[Bryce Seager van Dyk [:bryce] (he/him) - Not reading bugmail]

Could you please confirm that with media.mediasource.webm.enabled set to true and media.mediasource.mp4.enabled set to false this is taking place?

Comment 2

[Ciprian Georgiu, Desktop QA]

I confirm that with media.mediasource.webm.enabled set to true and media.mediasource.mp4.enabled set to false on the same environment, the issue is not reproducible anymore.

Comment 3

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

VP9/MSE isn't enabled on slow machines which support hardware H.264 decoding.