1511070 - Video positioning is incorrect on youtube

Status: RESOLVED DUPLICATE of bug 1511042

(Core :: Graphics: WebRender, defect)

Description

[Chris Cooper [:coop] (he/him)]

Attachment: Youtube video issues, default display

I'm using nightly on Win10 64-bit. Today while watching a video on Youtube, I noticed that the video was not centered properly in the viewing window.

I created a brand new profile and then took a screenshot to demonstrate the issue. Notice the black bars on the left and top in the attachment.

Interestingly, if I try to use Firefox Screenshots to capture the issue, the video is laid out correctly in the resulting screenshot:

https://screenshots.firefox.com/HVBfLg5D3krjXHDG/www.youtube.com

Version 	65.0a1
Build ID 	20181129095546
User Agent 	Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:65.0) Gecko/20100101 Firefox/65.0

Comment 1

[Chris Cooper [:coop] (he/him)]

Attachment: Youtube video issues, theater mode

Here's another screenshot of the same issue in theater mode.

Note: the black bars on the side are expected in this mode due to the aspect ratio of the video.

Comment 2

[Chris Cooper [:coop] (he/him)]

Fullscreen mode seems unaffected.

Comment 3

[Chris Cooper [:coop] (he/him)]

I checked, and Youtube videos are displayed correctly on the same nightly version on OS X (Mojave).

Version 	65.0a1
Build ID 	20181129095546
User Agent 	Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:65.0) Gecko/20100101 Firefox/65.0

Comment 4

[Daniel Holbert [:dholbert]]

The attached screenshot (attachment 9028682 [details]) looks like the same issue as shown in bug 1511146 on twitch, which means it's a dupe of bug 1511042.

(Presumably you're using webrender in the affected profile.)