1915156 - Widevine encrypted video playing without sound

Status: NEW

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

Description

[Timea Zsoldos [:zstimi/tzsoldos], Desktop QA]

Found in

• Firefox 131.0a1

Affected versions

• Firefox 129.0.2
• Firefox 130.0
• Firefox 115.15.0esr
• Firefox 128.2.0esr

Tested platforms

• Affected platforms: Windows 10, Ubuntu 22

Preconditions

• Change the pref media.gmp-manager.url link to https://aus5.mozilla.org/update/3/GMP/%VERSION%/%BUILD_ID%/%BUILD_TARGET%/%LOCALE%/nightlytest/%OS_VERSION%/%DISTRIBUTION%/%DISTRIBUTION_VERSION%/update.xml to use the new widevine version 4.10.2830.0

Steps to reproduce
Access the following site: https://shaka-player-demo.appspot.com/ and from All Content menu choose "Widevine - 16 Byte IV";
and "Widevine - 16 Byte IV - (mix of encrypted and unencrypted periods)"

Expected result

• The video starts playing automatically with sound using the new Widevine version (4.10.2830.0)

Actual result

• The video starts playing automatically without sound using the new Widevine version (4.10.2830.0)

Additional notes

• This issue reproduces with the current Widevine version (4.10.2710.0) and on Chrome as well.

Comment 1

[Jim Mathies [:jimm]]

Note this also happens in the old CDM.