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HTML 5 videos (like Vine) won't play

Some HTML5 videos won't play in my Firefox browser. This vine for example (https://vine.co/v/b3v5h3Piwt7) only shows up as a static image. I can click the mute/audio butt… (xem thêm)

Some HTML5 videos won't play in my Firefox browser.

This vine for example (https://vine.co/v/b3v5h3Piwt7) only shows up as a static image. I can click the mute/audio button though, but it won't play. When I look at the webconsole when I load the page then 2 javascript warnings show up, the first one say that the Mediasource [long url here] can't be encoded and another one says loading of all candidate sources failed. loading media paused.

I'm using Firefox 21.0 and I tried to run Firefox in safe mode with disabled add-ons, and I also tried to reinstall it, but without success.

Thanks in advance.

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How do I get HTML5 videos working again?

I updated to Firefox 35 recently and now HTML5 videos will not work. I do have NoScript, but disabling or removing it does not fix the problem. Switching to safe mode doe… (xem thêm)

I updated to Firefox 35 recently and now HTML5 videos will not work. I do have NoScript, but disabling or removing it does not fix the problem. Switching to safe mode does not fix the problem. The problem is solved by using a fresh profile or deleting the prefs.js file, but this is not an option for me, as restoring all my settings from scratch would be a time-consuming hassle I'd rather not deal with.

I know the problem is with the update to Firefox 35 specifically because everything was working fine before and stopped working after. To be absolutely certain, I turned on my laptop that had the same exact extensions and settings imported to it from this computer with FEBE a while back. It was using version 34.0.5 and everything was fine with that version. I tested it with the Vine website, all videos worked. It also downloaded the update to Firefox 35 in the background and as soon as I restarted it, the HTML5 videos were broken.

It's definitely something Mozilla changed but forgot to alter/remove an old setting that's gumming up the works. If I could just figure out which line(s) in the prefs.js file was causing the issue, I would delete/modify it myself in Notepad.

For the record, I already had media.windows-media-foundation.enabled set to false. All videos that use Flash seem to work. I think Vimeo uses HTML5, but it's the only non-Flash video site I could find that still works. Flash and Java have been updated to the latest versions.

Đã được hỏi bởi TigerNightmare 5 năm trước

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Firefox error: video format or MME type is not supported

Client said that video cannot load on firefox except other browsers. It shows "Video format or MIME type is not supported". Firefox version is 33.0.3. Video is mp4 forma… (xem thêm)

Client said that video cannot load on firefox except other browsers. It shows "Video format or MIME type is not supported". Firefox version is 33.0.3. Video is mp4 format.

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This video file cannot be played.(Error Code: 232011) Firefox help gives no specific and direct answer to this NEW problem

I'm running latest Firefox 68.2 64bit on Windows 7x64 Ultimate. This is a new problem, I can plat any media with all my apps and on other sites but Accuweather News https… (xem thêm)

I'm running latest Firefox 68.2 64bit on Windows 7x64 Ultimate. This is a new problem, I can plat any media with all my apps and on other sites but Accuweather News https://www.accuweather.com/en/videos/trending-now/co15rob4 videos are suddenly not playable. PS: Firefox Help was useless on this query/error. None of the results were relevant. Am I going to have to "Google Search for the solution? HELP please and thank you.

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No 4K resulution on youtube

Some videos on youtube don't show the 4k resolution option under firefox and the only go up to 1080P but on chrome they show all the resolutions: example video https://yo… (xem thêm)

Some videos on youtube don't show the 4k resolution option under firefox and the only go up to 1080P but on chrome they show all the resolutions:

example video https://youtu.be/WU-NrfB8Kd4

I have flash installed as well

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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 (… (xem thêm)

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.

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Firefox 49 error "This browser does not support video playback" playing mp4 videos in Twitter in Win 8.1 with Flash Player 23.0.0.162

About a month and a half ago MP4 videos in Twitter 29 played fine. Then I updated to the latest version of Adobe Flash player on both my Win 8.1 and old XP computers. Tha… (xem thêm)

About a month and a half ago MP4 videos in Twitter 29 played fine. Then I updated to the latest version of Adobe Flash player on both my Win 8.1 and old XP computers. That is when I started getting "This browser does not support video playback" error when trying to play a mp4 video in Twitter. I ran Firefox in Safemode ... no change. I removed all addons ... no change. All Plugins are Ask to Activate or Always Activated. I uninstalled Firefox and Flash player and reinstalled .. no change. The videos work fine in MS IE II and Chrome 53.0.2785.116 m. H264 Codec is installed. YouTube videos play fine.

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How can I stop videos from automatically starting (autoplay)?

Every web page with video / audio content begins to autoplay (at the vid's highest volume) approximately 5 seconds after opening the page. I could disable this in Safari … (xem thêm)

Every web page with video / audio content begins to autoplay (at the vid's highest volume) approximately 5 seconds after opening the page. I could disable this in Safari and Chromium, but see no option to disable the 'Autoplay' feature in Firefox. Worse, there are no plug-ins or extensions available that will allow this to be done. If you have had success disabling this annoying 'feature' (it's not a 'bug,' right?), please advise how it was done so that I may rid myself of these annoying vids. Thanks in advance.

Đã được hỏi bởi Dr_Know 3 năm trước

Đã được trả lời bởi FredMcD 3 năm trước

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videos will not load and play in fire fox

I have tried to refresh, start in safe mode , reloaded flash and turn on and off, back on of the plug-ins and nothing works to solve problem. I am limited on my knowledg… (xem thêm)

I have tried to refresh, start in safe mode , reloaded flash and turn on and off, back on of the plug-ins and nothing works to solve problem. I am limited on my knowledge.

Đã được hỏi bởi ldcrowe 2 năm trước

Đã được trả lời bởi FFus3r 2 năm trước

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Videos don't load

Ever since some update, Firefox won't load Vines or Tumblr videos, but load YouTube videos, Facebook videos, and pretty much everything else. I've disabled hardware accel… (xem thêm)

Ever since some update, Firefox won't load Vines or Tumblr videos, but load YouTube videos, Facebook videos, and pretty much everything else. I've disabled hardware acceleration, addons, and tried most (if not every) solution given here.

Đã được hỏi bởi dragonkid828 5 năm trước

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The option to open a mp4 file with Firefox is no longer available since changed to 64 bit, how to fix

I have installed the 64bit Firefox, removing the prior Firefox program. Now, when I click on a mp4 and choose to open with, browsing to Program Files/Mozilla Firefox/Fire… (xem thêm)

I have installed the 64bit Firefox, removing the prior Firefox program. Now, when I click on a mp4 and choose to open with, browsing to Program Files/Mozilla Firefox/Firefox.exe and clicking does nothing even when set as 'default' opening program. Am I to have the 32 bit installed into program files x86 or is there something else I need to do? Before when Firefox was installed, it was under program files x86, then the change to Quantum, (ran fine, I could use to view mp4 files), a computer crash with 'Cannot repair member file [l:30{15}]"mozilla.browser"', a new install with change folder 'old firefox', removed prior install of Firefox (one with older install date), now have issue that can't use to open mp4 file from computer.

Đã được hỏi bởi Philip 2 năm trước

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ON WINDOWS 8 LAPTOP: Firefox CANNOT play any video on Yahoo News, seriously, this is so freaking sad, Please help...., it just can't play. Please HELP.

To many people, this might sound like a Joke when i say Firefox can't play any video on Yahoo News on any Windows 8 Laptop Touchcreen, but trust me, I have tried everythi… (xem thêm)

To many people, this might sound like a Joke when i say Firefox can't play any video on Yahoo News on any Windows 8 Laptop Touchcreen, but trust me, I have tried everything; re-downloading Java, Flash-player, Adobe...etc, I even called Microsoft Support and my Computer company but they all said this is Firefox drama they should be able to fix the issue. Please help. I have three Computers and all can't play any video on Yahoo News, (Youtube is playing great, no issues). Please help.

Đã được hỏi bởi JJ Co 7 năm trước

Trả lời lần cuối bởi josephrot 7 năm trước

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WidevineCdm-plug-in crashed — no video playing

Since ± half october 2018 I can't play videos anymore on some sites and get this crash message. Youtube does work, probably because without Widevine? I'm on FF Dev Editio… (xem thêm)

Since ± half october 2018 I can't play videos anymore on some sites and get this crash message. Youtube does work, probably because without Widevine? I'm on FF Dev Edition, Mac with El Capitan. Thanks, Pieter

Đã được hỏi bởi Piroo 2 năm trước

Đã được trả lời bởi cor-el 1 năm trước

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Video playback is choppy

Going to the same website using Windows Explorer runs smoothly. I have installed Firefox 64.0.2. Is there anything else I can do before dumping FireFox?

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Why is it so difficult to get Firefox to play web videos?

I have developed a very basic opening page for my web site. It contains a 45 second movie. It works on IE, Chrome, and Safari but will not work on Firefox. Why? I have… (xem thêm)

I have developed a very basic opening page for my web site. It contains a 45 second movie. It works on IE, Chrome, and Safari but will not work on Firefox. Why?

I have spent numerous hours attempting to try workarounds with no luck. I am considering just putting a statement on my front page that says I cannot make this site work properly with Firefox.

It would seem to be in Firefox's best interest to figure this out and fix it vs being the lone browser out there where basic common video formats do not work well.

Please let me know if there is a very quick workaround to make this work because I am certainly not going to spend any more time trying to figure it out.

Thanks for listening

Đã được hỏi bởi anolte 6 năm trước

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Some Videos will not play in firefox but play fine in IE

I am running Windows 7 64 bit and Firefox is my browser. All of a sudden I can not play videos at places like Democracy Now and many other web sites (E.G. Malcolm Gladwel… (xem thêm)

I am running Windows 7 64 bit and Firefox is my browser. All of a sudden I can not play videos at places like Democracy Now and many other web sites (E.G. Malcolm Gladwell) but most of Youtube is okay - except sometimes. I thought this may have been due adGuard but disengaging it or starting FF clean with no ad ons has no effect.

I was just informed by Costco Concierge Services that the reason is that both FireFox and Google Chrome have decided to “no longer support” certain add ons or plug ins (what is the difference if any between these tech terms of art?) and therefore if I can not play a video I will have to use Internet Explorer. Discovering what videos I can or can not use is a hit an miss case by case basis.

So, first is this true? I can not imagine Firefox or Google Chrome making a change that would actually require its users of many years to bump their prime product and, instead, turn to its prime competitors. That seems like suicidal sabotage. We are just every day end-users and not software engineers and the explanations I find are absolutely incomprehensible technobabble.

In plain English what is the real problem? What is the fix? And has Firefox actually decided to make us dump Firefox and turn to its competitor just to watch certain videos? Has Democracy Now decided to continue using a video format that is no longer supported by FF?

The attached pic is just and example. DN uses jW player but I find this problem at other web sites too.

Đã được hỏi bởi LostInThisMaze 3 năm trước

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When I click with right mouse button on some facebook videos it doesn't show me options to copy link and etc.

When I click with right mouse button on some facebook videos it doesn't show me options to copy link and etc. It only shows settings for the flash player. how can I fix t… (xem thêm)

When I click with right mouse button on some facebook videos it doesn't show me options to copy link and etc. It only shows settings for the flash player. how can I fix this?

Đã được hỏi bởi jackiechan99 5 năm trước

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YouTube videos are black when using HTML5 player.

Today when I started up my laptop, Firefox wouldn't play any YouTube video - the audio still works and the preview of the frame when seeking is there, but instead of vide… (xem thêm)

Today when I started up my laptop, Firefox wouldn't play any YouTube video - the audio still works and the preview of the frame when seeking is there, but instead of video there is just a black screen. I have NO intention of installing Flash Player. Please help? Thanks in advance.

Đã được hỏi bởi username9001 5 năm trước

Đã được trả lời bởi guigs 5 năm trước

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Firefox is freezing during flash videos, from anywebsite youtube or whatever, I dont know what to do..

Happened a few days ago, every time I play a flash video on my Firefox only! chrome and explorer works fine , the image freezes I need to start clicking around and all my… (xem thêm)

Happened a few days ago, every time I play a flash video on my Firefox only! chrome and explorer works fine , the image freezes I need to start clicking around and all my icons turn black and it returns to normal and then freezes again, what the hell? this is my favorite browser and I don't want to move to chrome, so please help :(

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