This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

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

Cuireadh an snáithe seo sa chartlann. Cuir ceist nua má tá cabhair uait.

mp4 video plays but with no sound (W7, f/f 64bit, v75.0)

  • 3 fhreagra
  • 1 leis an bhfadhb seo
  • 4 views
  • Freagra is déanaí ó Gra

Gra
Gra
more options

A .mp4 video clip on the web will play through f/f but with no sound. A .mp3 audio clip plays ok. The laptop sound controls are not muted. The mp4 clip shows a bar at the bottom and on the right there's a symbol that looks like a speaker with a bar through it. There seems no way to change this. The mp4 clip will play perfectly in WMP and from the website on a Samsung phone.

A .mp4 video clip on the web will play through f/f but with no sound. A .mp3 audio clip plays ok. The laptop sound controls are not muted. The mp4 clip shows a bar at the bottom and on the right there's a symbol that looks like a speaker with a bar through it. There seems no way to change this. The mp4 clip will play perfectly in WMP and from the website on a Samsung phone.

Réiteach roghnaithe

There was a similar thread last year but I'm not sure we really got to the bottom of it: https://support.mozilla.org/questions/1268331

It's possible that Firefox is displaying messages about the problem in its Web Console. You can open the Web Console in the lower part of the tab using either:

  • "3-bar" menu button > Web Developer > Web Console
  • (menu bar) Tools > Web Developer > Web Console
  • (Windows) Ctrl+Shift+k

You can clear existing clutter by clicking the little garbage can icon above the existing list.

Then reload the page or re-trigger the media to play in the upper part of the tab and watch for error or security messages. Anything that sounds like it could be relevant?

Read this answer in context 👍 0

All Replies (3)

jscher2000 - Support Volunteer
jscher2000 - Support Volunteer
  • Top 25 Contributor
more options

Réiteach Roghnaithe

There was a similar thread last year but I'm not sure we really got to the bottom of it: https://support.mozilla.org/questions/1268331

It's possible that Firefox is displaying messages about the problem in its Web Console. You can open the Web Console in the lower part of the tab using either:

  • "3-bar" menu button > Web Developer > Web Console
  • (menu bar) Tools > Web Developer > Web Console
  • (Windows) Ctrl+Shift+k

You can clear existing clutter by clicking the little garbage can icon above the existing list.

Then reload the page or re-trigger the media to play in the upper part of the tab and watch for error or security messages. Anything that sounds like it could be relevant?

Hansi Gayathma
Hansi Gayathma
more options

Hi,

I hope this helps you.

https://www.transfermyvideofiles.com/mp4-files-no-sound/

Gra
Gra Úinéir na ceiste
more options

jscher2000 - -I tried that - web console shows no errors or warnings. But looking at the link to previous problem, setting media.play-stand-alone to false forces the file to be opened outside f/f in WMP and then it plays correctly. So I have a good work-around, but there's still a problem within f/f not solved. Thanks v much for the quick response.


hansigaya99 - In my case, WMP plays it properly when started outside f/f, so not sure if this is going to help. However, the page has got some useful looking content and I'll give it a go in due course. Thanks v much!