Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

Voice cracking on Firefox when playing DRM protected videos when playing at 2x speed

vedanshgarg77
vedanshgarg77
more options

I previously thought this was a Udemy bug, but then I tried playing other DRM protected videos on 2x on both Firefox and Chrome to compare..... and Yes, audio(specially speech) crackles in video on playback on 2x. Reference DRM video : https://bitmovin.com/demos/drm Try playing this in 2x speed and observe the voice crackle. Does not occur on Chrome and Edge

I previously thought this was a Udemy bug, but then I tried playing other DRM protected videos on 2x on both Firefox and Chrome to compare..... and Yes, audio(specially speech) crackles in video on playback on 2x. Reference DRM video : https://bitmovin.com/demos/drm Try playing this in 2x speed and observe the voice crackle. Does not occur on Chrome and Edge

All Replies (4)

FredMcD
FredMcD
more options

https://support.mozilla.org/en-US/kb/update-firefox-latest-version?cache=no Did you update Firefox to the latest version?

Version 95.0, first offered to Release channel users on December 7, 2021 Version 95.0.1, first offered to Release channel users on December 16, 2021 Version 95.0.2, first offered to Release channel users on December 19, 2021


https://support.mozilla.org/en-US/questions/1359657#answer-1463359 and updated to 95.0. . . . I finally found where the plugin "Widevine Content Decryption Module provided by Google Inc." was not updating to the newest version of December 1, 2021. Ver #4.10.2391.0

cor-el; Make sure you have the latest Widevine version. You can toggle DRM off/on to see if that makes Firefox (re)load DRM components.

You can possibly check the XHR requests in the Browser Console if this doesn't work.

vedanshgarg77
vedanshgarg77 Question owner
more options

FireFox is at latest verion : 95.0.2 Widevine Content Decryption Module provided by Google Inc. Plugin is at latest version : 4.10.2391.0 Have disabled and enabled DRM in firefox settings multiple times to (re)load DRM components. Have restarted Firefox multiple times.

Still the issue persists. Audio crackles when playing DRM videos on 2x speed.

The following reddit thread shows that I'm not the only one facing this issue. https://www.reddit.com/r/Udemy/comments/mvpqts/drm_on_udemy_videos_since_march_breaks_legitimate/

This is not a udemy bug, but a firefox issue... since any DRM video suffers from this (eg : https://bitmovin.com/demos/drm)

Kindly help

FredMcD
FredMcD
more options

I called for more help.

vedanshgarg77
vedanshgarg77 Question owner
more options

Hi,

Were you able to reproduce the bug? Is there any Github issues page where I can raise it for the dev team?

Thanks & Regards