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Only some videos play without audio, only in Firefox

I've recently done a clean reinstall of Windows 11 and have noticed that, only for Firefox (134.0.2, build ID 20250120135430), a few videos playback without any audio, ye… (read more)

I've recently done a clean reinstall of Windows 11 and have noticed that, only for Firefox (134.0.2, build ID 20250120135430), a few videos playback without any audio, yet the same videos play with audio when using edge as a comparison. Most (if not all) of these videos did play with audio in Firefox prior to this reinstall.

Firstly, I'm pretty sure this is not a windows sound mixer issue since many videos on the same page and tab play back with audio just fine in Firefox. The same goes for it not relating to the Firefox setting 'Speaker selection', under (burger) > settings > privacy & security > Permissions because videos of different formats (or using different players) on the same page play back audio fine. The tab is not muted. Again, some videos on the same browser tab play audio fine; some of a particular format or player only play the video, while missing the audio (and where Edge plays the same video with audio).

Another common and potentially relevant issue I've seen is that, this being a 'Windows 11 N" install, it was initially missing the settings > system > optional features > Media feature pack, but that is now something I've successfully added. I should add that windows did report problems when I initially tried to add the media feature pack but, after a very long delay, it eventually appeared to succeed when I ran a couple of DISM incantations that I think ended with - "dism /online /add-capability /capabilityname:Media.MediaFeaturePack~~~~0.0.1.0"

I have the 'Play DRM-controlled content' setting enabled.

Comparing the Firefox vs Edge video playback on this video test page - https://tools.woolyss.com/html5-audio-video-tester/ I get the following results (don't know how to get it formatted/aligned correctly, sorry) -

                           FF vid    FF audio    Edge vid    Edge audio
av1-opus-sita.webm          Works     Works       Works       Works
vp9-vorbis-spring.webm      Works     Works       Works       Works
vp8-vorbis-sintel.webm      Works     Works       Works       Works
avc-aac-nerdist-friends.mp4 Works     MISSING     Works       Works
avc-aac-big-buck-bunny.m4v  Works     MISSING     Works       Works
avc-mp3-sita.mov            Works     Works       Works       Works

And perhaps also relevant is that there's also a difference in the audio-only samples further down the table on the same page -

                   FF audio   Edge audio
audio-sample.mp3    Works      Works
audio-sample.weba   Works      Works
audio-sample.ogg    Works      Works
audio-sample.opus   Works      Works
audio-sample.flac   Works      Works
audio-sample.wav    Works      Works
audio-sample.m4a    FAILS      Works
ac192.mp3           Works      Works
spoonradio-hd.aac   FAILS      Works
audio.opus          Works      Works

Also, every 'v.redd.it' / reddit-video-player video plays the video fine but has no sound when using Firefox but plays both sound and video fine with Edge. Here's one for example - https://old.reddit.com/r/funny/comments/1i7y1nr/rock_paper_scissors/

I've seen lots of similar (but not identical) issues on Firefox video with no audio problems with suggestions a few things to try. In addition to what I've already mentioned above, I've tried the following without success -

- Restarting Windows - Restarting Firefox - Restarting Firefox with addons/extensions disabled - 'about:support' > Refresh Firefox - 'about:support' > Clear startup cache - (hamburger) > more tools > task manager > (click the little profile icon for the page playing the video) - I've checked the settings suggested here: https://support.mozilla.org/en-US/kb/fix-common-audio-and-video-issues#w_check-some-firefox-settings

I realise it may be possible to side-step this problem by flailing around with more drastic work-arounds like trying a clean re-install of Windows or a full uninstall and clean of Firefox, but that doesn't really help figure out the problem, which leaves the possibility it could easily happen again to me or others when it might be something that can be more properly fixed or guarded against in Firefox itself, so I hope someone can suggest what might be done to home in on identifying the cause of the problem and so learn whether a more precise fix can be employed.

Asked by Ernie_Gurney 2 weeks ago

Last reply by Ernie_Gurney 5 hours ago

Audio player runs but no audio/ sound.

on Sunday, Feb. 02, 2025, at about 20H15 PT, WSJ security monitor "zapped" Firefox browser audio player . While i was texting my son the security was challenged to liste… (read more)

on Sunday, Feb. 02, 2025, at about 20H15 PT, WSJ security monitor "zapped" Firefox browser audio player . While i was texting my son the security was challenged to listen to my keystrokes , from both my iPhone & laptop, while i had music from my speaker system in the background.

My iPhone & laptop "use" Firefox browser. Cannot get sound when i try to play online playlists.

Maybe reinstall Firefox browser on iPhone & PC laptop will correct the problem?

Tues. Feb. 04/'25 12h18 PT

Wiil be away until about 17h PT. EaRL.

Asked by E-humm 2 days ago

reels audio

i have been using firefox for quite some time. but as of late when i open a reels video on f/b sound works fine just no video. i have deleted ff and re loaded the latest … (read more)

i have been using firefox for quite some time. but as of late when i open a reels video on f/b sound works fine just no video. i have deleted ff and re loaded the latest ver. it will work on microsoft edge any help appreciate

Asked by rpow 3 days ago

sound and some video

Sound and some video's don't work on facebook on my pc with firefox. Works fine on my phone with firefox . When I use a different browser on my pc it is fine. I am gettin… (read more)

Sound and some video's don't work on facebook on my pc with firefox. Works fine on my phone with firefox . When I use a different browser on my pc it is fine. I am getting pissed off with the piss poor help system you are running here. No help means No good. Do you even look at these crappy reports. Because you are not responding and I have no idea if you give a fuck? well do ya.

Asked by peteryoung20 4 days ago

Pixilation of news channels and solcial media feed such as X, substack BBC and others

In playing videos from other feeds the video opens and within seconds the picture is pixilated although the sound is clear. Has been like this for about 5 days since your… (read more)

In playing videos from other feeds the video opens and within seconds the picture is pixilated although the sound is clear. Has been like this for about 5 days since your last release. Place the URL in Chrome and running the video shows NO pixilation. This is very frustrating.

I have attached various screen shots from different feeds

Asked by henry.wild 5 days ago

Videos on YouTube/Instagram

I've been using Firefox for the various iterations of Windows for many years and it's gone smoothly. Now, when I play a YouTube or Instagram video in Windows 11, the vide… (read more)

I've been using Firefox for the various iterations of Windows for many years and it's gone smoothly. Now, when I play a YouTube or Instagram video in Windows 11, the video often becomes just an image of pixelated multicolored squares. The sound continues to play normally. On YouTube, the video continues to play. On Instagram the video tends to freeze. I've attached a screenshot from an Instagram video.

I checked my external monitor and it's definitely the laptop, which is less than a year old. This only happens with videos and other browsing works as usual. I have no issue using Chrome, so it seems to be a Firefox thing. I tried clearing the cache and history. When that didn't work, I uninstalled Firefox completely and reinstalled it. Same issue. I've attached a screenshot from an Instagram video. Thanks for any advice you can offer.

Asked by woodswoman 5 days ago