1941740 - dennys.com - Images/animation from hero section is not displayed

Status: NEW

(Web Compatibility :: Site Reports, defect, P2)

Description

[Calin Tanase]

Attachment: image.png

Environment:
Operating system: Windows 10
Firefox version: Firefox 134/136

Preconditions:

• Clean profile
• VPN pointing to USA

Steps to reproduce:

1. Navigate to: https://www.dennys.com
2. Observe the hero section.

Expected Behavior:
The images/animation is displayed.

Actual Behavior:
The images/animation is missing.

Notes:

• Reproducible on the latest Firefox Release and Nightly
• Reproducible regardless of the ETP setting
• Works as expected using Chrome

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

Since nightly and release are affected, beta will likely be affected too.
For more information, please visit BugBot documentation.

Comment 2

[Daniel Holbert [:dholbert]]

I don't think this is Firefox-specific.

I can reproduce this in Firefox Nightly 136 on Linux, and also Chrome 134 dev on LInux.
I can also reproduce in Firefox release 134 and Chrome 132 release on Windows 10 (tested using BrowserStack).

I can not reproduce in Firefox Nightly 136 on my MacBook Pro, but I can reproduce in Firefox

The background of this hero element is an mp4 video file, specifically https://www.dennys.com/sites/default/files/video-thumbnails/2024-10/307800_Nov24_Website_HomepageHero_540p.mp4 , and Firefox (and Chrome) is failing to decode it on my machine -- when I view the site as well as when I just view the video directly (it fails to play, though it plays successfully in gnome-web/epiphany i.e. WebKit).

Firefox Nightly's Web Console shows the following on Linux and Windows:

Media resource https://www.dennys.com/sites/default/files/video-thumbnails/2024-10/307800_Nov24_Website_HomepageHero_1080p.mp4 could not be decoded. www.dennys.com
All candidate resources failed to load. Media load paused.
Media resource https://www.dennys.com/sites/default/files/video-thumbnails/2024-10/307800_Nov24_Website_HomepageHero_540p.mp4 could not be decoded. www.dennys.com
All candidate resources failed to load. Media load paused.
Media resource https://www.dennys.com/sites/default/files/video-thumbnails/2024-10/307800_Nov24_Website_HomepageHero_1080p.mp4 could not be decoded, error: Error Code: NS_ERROR_DOM_MEDIA_METADATA_ERR (0x806e0006)

Anyway: kicking this over to the media team for further diagnosis, given that it seems like a media handling issue (possibly needing to be graceful in the face of corrupt/broken content).

Comment 3

[Daniel Holbert [:dholbert]]

Attachment: the video in question ( 307800_Nov24_Website_HomepageHero_540p.mp4 )

Here's a copy of the smaller video file that's referenced in the web console output, for archival/reference purposes. (This is https://www.dennys.com/sites/default/files/video-thumbnails/2024-10/307800_Nov24_Website_HomepageHero_540p.mp4 )

Comment 4

[Daniel Holbert [:dholbert]]

Aha, so this is a HEVC video [1] which we only just started supporting and only on macOS, in bug 1924066.

I get this fix range for dennys.com starting to work on macOS (which contains only that one bug to enable HEVC support):
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=af3032626a68b96b683ca4359802fc025da8e08c&tochange=2ab38f908263fc74938c293fca89c0336c78aedc

That explains the variable support between the same browser on different platforms that I observed above.

I think we can consider this an instance of bug 1889731 then.

[1] confirmed with mplayer on linux which has this in its terminal output when playing this video: VIDEO: [HEVC] 960x540 24bpp 23.976 fps 889.3 kbps (108.6 kbyte/s)

Comment 5

[Calin Tanase]

This is still an issue on the latest Nightly 145.0a1 (2025-10-02).

Comment 6

[Raul Bucata]

This is still an issue on the latest Nightly

Comment 7

[Raul Bucata]

This is still an issue on the latest Nightly

Comment 8

[Raul Bucata]

This is still an issue on the latest Nightly