1958667 - Firefox 137 + Windows 11 24H2 DRM video playback fails when not installed at C:

Status: UNCONFIRMED

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

Description

[TheQuickFox]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:137.0) Gecko/20100101 Firefox/137.0

Steps to reproduce:

When I install Firefox 137 on any other drive than C:, I cannot play DRM videos.
Both the portable versions as the installer versions. A fresh install with a virgin profile does not fix this.

Firefox x64 Windows 11 24H2
ESET Internet Security 18.0.12.0

Actual results:

https://npo.nl/start/serie/nos-journaal/seizoen-25_23/nos-journaal_98527/afspelen fails to play. When I move the browser to the C: drive it magically works.

Expected results:

Playback of DRM protected videos should not depend on the drive the browser is being launched from.

Comment 1

[TheQuickFox]

https://developer-tools.jwplayer.com/stream-tester

Firefox launched from D: or Z: drive
Video plays, DRM video does not play.

Firefox launched from C: drive:
Video plays, DRM video plays.

Comment 2

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

The Bugbug bot thinks this bug should belong to the 'Firefox::Installer' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 3

[TheQuickFox]

I think the bot is wrong. I think the installer is fine, but the bug is in the installed product.

Comment 4

[TheQuickFox]

Issue dot not occur with Firefox 136. Only with 137.

Comment 5

[Andrew Osmond [:aosmond] (he/him)]

The regression doesn't make sense for this explanation but there is bug 1763978 where we have issues with plugins on ramdisk drives.

Comment 6

[Andrew Osmond [:aosmond] (he/him)]

What is the nature of the Z: and D: drives? Are they ramdisk, network, a different physical disk, just a partition on the same drive as the C: drive? Thanks!

Comment 7

[TheQuickFox]

(In reply to Andrew Osmond [:aosmond] (he/him) from comment #6)

What is the nature of the Z: and D: drives? Are they ramdisk, network, a different physical disk, just a partition on the same drive as the C: drive? Thanks!
In my case:

C: is a system encrypted VeraCrypt partition
D: is a mounted encrypted VeraCrypt container
Z: is a mounted encrypted VeraCrypt container

I use no RAM disk

Comment 8

[Andrew Osmond [:aosmond] (he/him)]

Interesting, this really does feel similar to bug 1763978 save for the fact that this is a regression....

Are you able to reproduce this using mozregression? This would be the fastest way to understand what changed in 137 that regressed this:
https://mozilla.github.io/mozregression/quickstart.html

Comment 9

[Andrew Osmond [:aosmond] (he/him)]

Explanation of container vs partition:
https://veracrypt.eu/en/VeraCrypt%20Volume.html

Comment 10

[Alastor Wu [:alwu]]

Hi, would you mind follow this instruction to capture a media profile? Thanks!

Comment 11

[Andrew Osmond [:aosmond] (he/him)]

Also, does the build below solve your problem? This includes the patch that was backed out which solved the ramdisk problem:
https://treeherder.mozilla.org/jobs?repo=try&revision=68353a794b95f80c9e25c61f81060d6cda0951be&selectedTaskRun=CtzveuKdQ5mr9vrdX1D8Mw.0

You can download the target zip (just extract and run firefox binary) or exe (installer) from the artifacts tab.

Comment 12

[TheQuickFox]

(In reply to Alastor Wu [:alwu] from comment #10)

Hi, would you mind follow this instruction to capture a media profile? Thanks!

https://share.firefox.dev/4lsy1XK

Comment 13

[TheQuickFox]

(In reply to Andrew Osmond [:aosmond] (he/him) from comment #11)

Also, does the build below solve your problem? This includes the patch that was backed out which solved the ramdisk problem:
https://treeherder.mozilla.org/jobs?repo=try&revision=68353a794b95f80c9e25c61f81060d6cda0951be&selectedTaskRun=CtzveuKdQ5mr9vrdX1D8Mw.0

You can download the target zip (just extract and run firefox binary) or exe (installer) from the artifacts tab.

Still only works from my C: drive. Not my Z: drive. And as this is a fresh install it also rules out my profile and the many add-ons I use on my main (portable) version.