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

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 th… (read more)

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.

Asked by Gra 2 months ago

Answered by jscher2000 2 months ago

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Linux/Fedora30 h.264 media "is not supported" but downloaded video plays fine

ffmpeg is installed == From twitter web page: error in web console: For example, on twitter i get a "the media could not be played" placeholder and this in the web consol… (read more)

ffmpeg is installed

== From twitter web page: error in web console:

For example, on twitter i get a "the media could not be played" placeholder and this in the web console:

HTTP “Content-Type” of “video/mp4” is not supported. Load of media resource https://video.twimg.com/amplify_video/1149302678771683333/vid/1280x720/qFCcMLAnjR_MBans.mp4?tag=13 failed. home

The video on this page can’t be played. Your system may not have the required video codecs for: video/mp4; codecs="avc1.42E01E mp4a.40.2"

When i click on that link in the error it saves the video to /tmp and plays it in ffplay.. and in preferences->Applications, video/mp4 shows up with ffplay configured.

== Plays fine with a local file

When I put that mp4 link in the address bar, it gives me a download dialog, I can download that file, and play it in firefox from the command line:

firefox qFCcMLAnjR_MBans.mp4

== Plays fine with a local html file with the video control html element:

When i open a local html file with the video control element that plays the video. So why do I get those errors when this is viewed on the twitter website?

Any pointers appreciated.

Thanks!

Asked by Ran 1 year ago

Last reply by cor-el 12 months ago

  • Archived

In Firefox 38 and above, HTML video element doesn't play mp4 videos

We're using a URL like "http://.....*.mp4", which will play the mp4 video files in mozilla firefox. In our code we are using <Video> element, and the video is getti… (read more)

We're using a URL like "http://.....*.mp4", which will play the mp4 video files in mozilla firefox. In our code we are using <Video> element, and the video is getting played up to Firefox 37.0. After upgrading to Firefox 38.0 the video is not getting played.

The error message "Media Resource could not be decoded" is displayed on debugging to the following line:

document.getElementById("Video2").src="http://...*.mp4"

<video id="Video2" controls/>

Asked by Aabaavaanan 4 years ago

Last reply by Aabaavaanan 4 years ago

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  • Archived

mp4 problem in Firefox v37.0.2 Windows 8.1

I'm using Firefox with 4 profiles. One of them doesn't work mp4. What could be the problem? When I open mp4 http://www.quirksmode.org/html5/videos/big_buck_bunny.mp4 it s… (read more)

I'm using Firefox with 4 profiles. One of them doesn't work mp4. What could be the problem? When I open mp4 http://www.quirksmode.org/html5/videos/big_buck_bunny.mp4 it says "Video can't be played because the file is corrupted.".

Asked by Boray Eris 5 years ago

Answered by Boray Eris 5 years ago

  • Solved
  • Archived

Videos / mp4s will not play in Firefox

Videos, like mp4 Vines, won't play in Firefox. Same with the media files like podcasts in rss feeds. All used to work fine. This is an intermittent problem with Firefox (… (read more)

Videos, like mp4 Vines, won't play in Firefox. Same with the media files like podcasts in rss feeds. All used to work fine. This is an intermittent problem with Firefox ( might be due to updates ) but it doesn't happen with IE or Chrome

If i uninstall VLC player or disable the VLC plugin, nothing happens If i have those installed but the VLC plugin is set to " Never activate ", i can right click on the video image, click " Play " and it opens in VLC player and works perfectly. If i have the plugin set to " always activate " then i see a black square and the message " the video can't be played because the file is corrupt "

Windows 8.1, Firefox 35.

This is an issue with Firefox and needs to be resolved.

Asked by Ipcress 5 years ago

Answered by Ipcress 5 years ago

  • Archived

h.264 videos that played in Firefox 34 won't play in Firefox 35.0

We host a ton of h.264 videos in the mp4 container displayed through JW Player. We had zero problems with Firefox 34 and earlier playing these videos, the video is H.264… (read more)

We host a ton of h.264 videos in the mp4 container displayed through JW Player. We had zero problems with Firefox 34 and earlier playing these videos, the video is H.264 and the audio is AAC, the whole thing is around 500 kbit/s.

They play fine on Firefox 34, Chrome and IE but after updating to Firefox 35.0 we get an error: "Error loading media: File could not be played".

We have found a fix to get them to work in the about:config, switching "media.fragmented-mp4.enabled" to false OR switching "media.fragmented-mp4.exposed" to false will allow our videos to play. Single file mp4's will also begin to download where before we would get a "Video can't be played because the file is corrupt."

Alternatively for Mac users if they just set media.apple.mp4.enabled to False it also works fine.

Non h.264 mp4 videos will play fine.

Here is a playlist that won't play: http://media.vineyardinstitute.org/other/vi_announcement/firefox-test.html Here is the single video file: http://media.vineyardinstitute.org/other/vi_announcement/05_kingdom_theology.mp4

Is there anything I can change on either the playlist or the video files to get this to work? Why would the h.264 files that worked in Firefox 34 NOT work in 35? I will not be able to re-encode all of the videos, it would take me months. Is this a bug with Firefox?

Also I have tried this in safe mode, tried with every plugin deactivated, I have uninstalled Flash and the videos would not play as well as reinstalling a new version of Flash and a fresh copy of Firefox 35.0

Any help would be much appreciated, we are currently directing all of our users away from Firefox till we get this resolved.

Thanks,

Kyle

Asked by VI-Tech 5 years ago

Last reply by guigs 5 years ago