Firefox doesn't scale YouTube HTML5 videos

It started recently. Most probably after the recent update to 37.0. What's most weird is that when I disable ALL extensions it doesn't help but when I start Firefox via troubleshooting >> without addons... videos scale correctly.
NOTE:
I use the 125% global system scaling option.

Check here
*https://developer.mozilla.org/en-US/docs/HTML/Supported_media_formats

Similar Messages

Safari 5.1.2 Youtube HTML5-Video issues

Fullscreen-Button on Youtube doesn't work for HTML5 videos on Youtube in Safari. Also there are problems with the video performance. The process QTKitServer Safari Webcontent has 105% CPU, the whole MacBook is very slow in that moment.
This is only a problem in Safari!
Since three years i use Safari for all my work on the net. But after the upgrade to Lion, this browser has a lot of bugs and getting slower and slower. I think it is time to change the browser. :S

Yes. I have the same problem as well. Watching a video on Youtube and the process called QTKitServer goes above 100%. I haven't figured out why (html 5 or fullscreen or whatever) but I didn't noticed it before.
Macbook, Snow Leopard, Safari 5.1.2 with only the Adblock extension running.

Using Flash player even though YouTube HTML5 video player is enabled

I'm in YouTube HTML5 video player beta program (http://youtube.com/html5), but even with it being enabled, every time I play a YouTube video it's still using Flash player.

try adding '''&html5=True''' to the end of the URL

Why doesn't Webm and HTML5 Video doesn't work on youtube with Firefox 4.0b8pre?

I go to http://www.youtube.com/html5 and enable html5. I do not get any video tags or content of the sort.
If I do a search: http://www.youtube.com/results?search_query=gods+gonna+cut+you+down&aq=0&webm=1
None of those videos will appear with the video tag. It will all be adobe flash even though I don't have flash installed. Youtube used to work great with firefox4.0.

The problem is with your user agent. it is:
Mozilla/5.0 (X11; Linux x86_64; rv:2.0b8pre) Gecko/20101111 Firefox-4.0/4.0b8pre
While it should be:
Mozilla/5.0 (X11; Linux x86_64; rv:2.0b8pre) Gecko/20101111 Firefox / 4.0b8pre
I have the same problem, and while I do not know its cause, I have found a workaround- install user-agent-switcher.....
Have you installed firefox-4 with the "daily" ppa too?

Youtube html5 video stops loading at one point when watching video with 720p

when i change 360p to 720p its pretty often when Dube stops loading video, in the middle or near the end, its random, but i notice it when video stops playing like when u pause it & sometimes i need to reload page 2-4times before i can finish watching, & sometimes the 3th or 4th time is not reloading its closing Dube & reopening it & then from history selecting that video again
1. do a lot of people have that issue?
2. do i half to W8 until HTM5 creators fix the issue?
3. or can it be fixed by user who is not advanced user?
4. if yes then how it can be fixed?
5. or is it Firefox Problem or bug?

''guigs2 [[#answer-704713|said]]''
<blockquote>
Ah! Sorry for the misunderstanding. If you update Flash to version 17, you should not run into this anymore.
</blockquote>
how does updating flash effect HTML5? i went back to flash, cause this was more pain then memory leak caused by flash

YouTube HTML5 videos are choppy in Windows 10

Disabling hardware acceleration addresses the issue. Does not repro if I play them in IE or Chrome on the same machine.

It makes sense for Mozilla to invest some time in an OS that many millions of people will be upgrading to, albeit I can understand having to wait until developer documentation is released so that Firefox devs can troubleshoot effectively. :)
Regardless, I've filed the bug with Microsoft - it might just be an Intel driver problem, as the issue isn't happening on my other machine with an NVidia GPU.

Safari 5.1.2 doesn't play HTML5 video

I'm developing a website which uses HTML5 video as a fullscreen background. At home, I'm developing on a MBP running Snow Leopard. At work, I'm using Lion with Safari 5.1.2.
Currently, the page displays fine on Safari/Snow Leopard, Chrome/OSX, Firefox/OSX, IE9 (what?!), Chrome/Win and Firefox/Win.
Safari 5.1.2 on Lion and on Windows will NOT play the video and instead defaults to the poster image I have set.
The video has .mp4, .webm and .ogv versions for all the supported browsers.
I have tested this by downgrading my Lion computer to Safari 5.0.5 and the video played perfectly.
Any ideas? Seems like people are having issues with 5.1.2 and YouTube HTML5 videos also.

I believe you..
At home, I'm developing on a MBP running Snow Leopard. At work, I'm using Lion with Safari 5.1.2.
You might try getting help from the dev forums > The Apple Developer Forums provide iOS, Mac, and Safari Developer Program

Yuotube HTML5 videos won't play on Firefox

I can't play Youtube HTML5 videos in Firefox, although I can in Safari. I just see a blank black rectangle, and nothing plays. No picture, no sound.
I have Firefox 3.0 and OS 10.9.3.
The add-ons I have running are:
adblock plus 2.6.4
autofil 3.6
autopager 0.9.0.10
classic theme restorer 1.2.1
colorful tabs 24.3
fastest fox 5.2.1
flagfox 5.0.5
flashblock 1.1.17
forecastfox 2.2.4
foxclocks 3.4.14
foxtab 1.4.9
image zoom 0.6.3
last pass 3.1.1
no squint 2.1.0
pdf download 3.0.0.2
pocket 3.0.5
troubleshooter 1.1a
userzoom survey tool 5.2.2.21
wot 20131119
xmarks 4.3.1
youtube mp3 podcaster 3.3.4

If you use extensions (Firefox/Tools > Add-ons > Extensions) that can block content (e.g. Adblock Plus, NoScript, Flash Block, Ghostery) then make sure that such extensions aren't blocking content.
Clear the cache and cookies only from websites that cause problems.
"Clear the Cache":
*Firefox/Tools > Options > Advanced > Network > Cached Web Content: "Clear Now"
"Remove Cookies" from sites causing problems:
*Firefox/Tools > Options > Privacy > "Use custom settings for history" > Cookies: "Show Cookies"
Start Firefox in [[Safe Mode|Safe Mode]] to check if one of the extensions (Firefox/Tools > Add-ons > Extensions) or if hardware acceleration is causing the problem.
*Switch to the DEFAULT theme: Firefox/Tools > Add-ons > Appearance
*Do NOT click the Reset button on the Safe Mode start window
*https://support.mozilla.org/kb/Safe+Mode
*https://support.mozilla.org/kb/Troubleshooting+extensions+and+themes

HTML5 video encoding

What are people using to encode video for HTML5? The players I have looked at want .mp4, .ogg, and .webm. Media Encoder (At least the CS5 version) doesn't do the last 2. I tried the Miro encoder, but that has no controls, and has quality issues. I'm looking for a professional solution (hopefully not crazy expensive) for OSX.

heres some info re: html5 and video and various mobile devices and also browsers.. there's 2 different pastes ..first is from a doc file I have ..then theres a txt file....the info is about 9 months or a year old ...
plenty of links in articles to follow thru
=====
This is all done without JavaScript and requires only two video encodes, one Ogg file, and one MP4 file. Instructions on how to convert your videos to these formats are provided further down this article.
It’s compatible with HTML 4, HTML5 (valid markup), XHTML 1 and additionally also works when served as application/xhtml+xml.
For a full browser compatibility list, see the Video for Everybody Test Page.
The Code
Here follows the full source code. It’s very large because it’s fully commented.
You can easily compact this down (one such example follows afterwards).
To save time you could use the Video for Everybody generator by Jonathan Neal to generate the code snippet according to your options.
Do not miss the important notes below or you will be kicking yourself after wasting hours trying to get it to work.


<video width="640" height="360" controls>
 
 <source src="__VIDEO__.MP4" type="video/mp4" />
 <source src="__VIDEO__.OGV" type="video/ogg" />
 
 <object width="640" height="360" type="application/x-shockwave-flash" data="__FLASH__.SWF">
 
 <param name="movie" value="__FLASH__.SWF" />
 <param name="flashvars" value="controlbar=over&image=__POSTER__.JPG&file=__VIDEO__.MP4" />
 
 <img src="__VIDEO__.JPG" width="640" height="360" alt="__TITLE__"
 title="No video playback capabilities, please download the video below" />
 </object>
</video>

 Download Video:
 Closed Format: <a href="__VIDEO__.MP4">"MP4"</a>
 Open Format: <a href="__VIDEO__.OGV">"Ogg"</a>

(If you would like your video to automatically start playing, check out the sample code on the test page.)
Here’s a compacted version as an example:
<video width="640" height="360" controls>
 <source src="__VIDEO__.MP4" type="video/mp4" />
 <source src="__VIDEO__.OGV" type="video/ogg" />
 <object width="640" height="360" type="application/x-shockwave-flash" data="__FLASH__.SWF">
 <param name="movie" value="__FLASH__.SWF" />
 <param name="flashvars" value="controlbar=over&image=__POSTER__.JPG&file=__VIDEO__.MP4" />
 <img src="__VIDEO__.JPG" width="640" height="360" alt="__TITLE__"
 title="No video playback capabilities, please download the video below" />
 </object>
</video>
 Download Video:
 Closed Format: <a href="__VIDEO__.MP4">"MP4"</a>
 Open Format: <a href="__VIDEO__.OGV">"Ogg"</a>

And one that auto plays: (notice the changes “autoplay” and “autostart=true”)
<video width="640" height="360" controls autoplay>
 <source src="__VIDEO__.MP4" type="video/mp4" />
 <source src="__VIDEO__.OGV" type="video/ogg" />
 <object width="640" height="360" type="application/x-shockwave-flash" data="__FLASH__.SWF">
 <param name="movie" value="__FLASH__.SWF" />
 <param name="flashvars" value="autostart=true&controlbar=over&image=__POSTER__.JPG&file=__VIDEO__.MP4" />
 <img src="__VIDEO__.JPG" width="640" height="360" alt="__TITLE__"
 title="No video playback capabilities, please download the video below" />
 </object>
</video>
 Download Video:
 Closed Format: <a href="__VIDEO__.MP4">"MP4"</a>
 Open Format: <a href="__VIDEO__.OGV">"Ogg"</a>

It’s advised you subscribe to the RSS to be kept informed of new releases in case you get caught out by new bugs introduced by vendors *cough*Apple*cough*. The version isn’t <1 for no reason.
IMPORTANT Notes
Ensure your server is using the correct mime-types. Firefox will not play the Ogg video if the mime-type is wrong. Place these lines in your .htaccess file to send the correct mime-types to browsers
Replace __VIDEO__.MP4 with the path to your video encoded to MP4 (a warning on using H.264) and
replace __VIDEO__.OGV with the path to your video encoded to Ogg.
Optionally you could also include a WebM video.
Replace __POSTER__.JPG with the path to an image you want to act as a title screen to the video, it will be shown before the video plays, and as a representative image when the video is unable to play (Also replace “__TITLE__” for the poster image’s alt text). Not all browsers support the poster attribute, it’s advisable to encode the poster image into the first frame of your video.
2. AddType video/ogg .ogv
3. AddType video/mp4 .mp4
AddType video/webm .webm
DO NOT INCLUDE THE poster ATTRIBUTE (<video poster="…">) FOR iOS 3.x SUPPORT. There is a major bug with iOS 3 that means that playback will not work on any HTML5 video tag that uses both the poster attribute and <source> elements. This was fixed in iOS 4.0, but of course for now there will still be a large number of OS 3 users. This bug does not affect use of the poster image in the flashvars parameter, which you should retain
Replace __FLASH__.SWF with the path to the Flash video player you are using. I use JW Player (download and place ‘player.swf’ in the right place), but this could be any Flash resource including YouTube. Sample code for using YouTube can be seen on the Video for Everybody YouTube Test Page
Safari buffers the video automatically even if autobuffer is absent. This has been fixed in WebKit nightlies with a change to the HTML5 spec; the “preload="none"” attribute on the video element prevents autobuffering. A current bug in WebKit causes Safari to perpetually display “loading” until the play button is clicked
The iPhone will not autoplay. This is done to save bandwidth which may cost some users.
It is not a bug, it’s a feature
HTML5 video on Android is badly broken. Resolution support varies from one handset to the next (often just 480x360), the fallback image usually doesn’t show and the code requires special adjustments. The Android emulator is completely useless as it doesn’t represent any real hardware and does not play HTML5 video. THERE IS NO WAY TO TEST ON ANDROID WITHOUT A PHYSICAL PHONE. BLAME GOOGLE.
Android 2.3 (Gingerbread) now finally supports the controls attribute, so that VfE can work, but this still leaves all previous Android versions in the lurch. Use MediaElement.js or VideoJS for better Android support.
Some web hosts, in trying to save bandwidth, gzip everything by default—including video files! In Firefox and Opera, seeking will not be possible or the video may not play at all if a video file is gzipped. If this is occurring to you please check your server / hosts and disable the gzipping of Ogg and other media files. You can switch off gzipping for video files in your .htaccess file by adding this line:
SetEnvIfNoCase Request_URI \.(og[gv]|mp4|m4v|webm)$ no-gzip dont-vary
With thanks to Bas van Bergen for this tip
There are some instances where people will simply not be able to view the video inside the web-page (e.g. Opera Mobile / Mini). It is absolutely essential that you provide download links outside of the video to ensure your message gets through
A current bug in Firefox means that when JavaScript is disabled (NoScript for example) the video controls do not display. For now, right-click on the video for the controls, use autoplay on your videos or rely on users allowing your site in NoScript
The Eolas ‘Click to Activate’ issue affects Flash in Internet Explorer 6 / 7 as the ActiveX controls are not inserted using JavaScript—however Microsoft removed ‘Click to Activate’ in a later update patch. This issue will not affect users who have run Windows Update.
Please also note that Windows XP originally shipped with Flash v6, and H.264 playback in Flash requires v9 or 10. Depending on what Flash video player you use, this may cause problems if you intend to support users with out of date Flash versions
A parsing bug in Camino 2.0 / Firefox 3.0 means that the image element inside the video element will ‘leak’ outside of the video element. This is not visible however unless some kind of background image or colour is applied to that image element. You can stop this by either wrapping the video element in another element or modifying the code from “<source … />” to “<source …></source>”. This works, but will not validate as HTML5
In IE9 beta, both the HTML5 video and Flash video underneath play at the same time. This does not occur in IE9 Platform Preview 7, which is newer than IE9 beta. It is assumed that an update to IE9 beta will fix this issue
Adding Custom Controls
Since VfE doesn’t come with any JavaScript the HTML5 video will use whatever native interface the browser provides. This is in the best interest of the user because it provides an interface best tailored to that device. For example, the iPhone always plays video fullscreen so that the edges of the video are not cut off in the browser and the user does not have to pan around to get it all in view. The iPad provides finger-friendly sized controls.
Different native video controls in Opera 10.5 and Google Chrome
Designers however don’t like the inconsistency and would like a unified set of controls. Both MediaElement.js and VideoJS use VfE and custom controls you can style how you please with CSS.
Encoding the Videos
Full instructions are beyond the scope of this article, please refer to Mark Pilgrim’s Video on the Web article for an excellent introduction to video formats and encoding instructions.
There is no restriction on the resolution of the Ogg video
The iPhone can play MOV and MPEG4 videos with a maximum size of 640x480 and only allows the Base Profile for H.264 (See Apple’s own instructions for the specifics). If your desired video is bigger than that, please read the instructions below for how to adjust the code to use hi-res videos whilst keeping iPhone compatibility
The iPad can play H.264 up to 720p, 30 FPS
Firefox will only play Ogg (WebM is also supported in Firefox 4), and it will not degrade to Flash if there is no Firefox-compatible video file
For best results I recommend including the poster image as the first frame when you encode the video
Using HD Video
If you would like to use a larger video than 640x480, you can use a QuickTime reference movie to auto-select between an iPhone compatible version and the full-size video. In QuickTime Pro use the ‘File » Export for Web…’ option to output a reference movie (you can also use Apple’s MakeRefMovie tool for finer control). You’ll have three files along these lines: “video.mov”, “video-desktop.mp4” (or m4v) and “video-iphone.mp4”. Now replace the two source elements in the code with these three: (substituting the right file paths)
<source src="video.mov" type="video/mp4"></source>
<source src="video-desktop.mp4" type="video/mp4"></source>
<source src="video.ogv" type="video/ogg"></source>
What happens here is that the browser will play the QuickTime reference movie (Safari / iPhone / iPad) which will auto-select between the desktop and iPhone versions of the video automatically. If the MOV format isn’t supported by the browser (Chrome for example), we point to the same MPEG4 video that the QuickTime reference movie uses.
A Warning About H.264
I made Video for Everybody because since I don’t have Flash installed I wanted to create a way websites could provide me access to their videos (currently needlessly trapped inside Flash) without having to lose viewers from older browsers. VfE is not a tool I would use myself (other videos on this site are HTML5/Ogg only) because of the threat that H.264 represents to freedom on the web. Websites that are already serving H.264 video to users using Flash have already made the conscious decision to buy into H.264. I am not making that decision for you with Video for Everybody.
Just be aware that if you decide to use H.264 video for commercial use then you will need to purchase a licence from the MPEG-LA. Be warned that ‘commercial use’ may also include the scenario where your website has advertisements, even though your use of video is unrelated to those adverts. If you are making any any money in any way from a page that also includes an H.264 video, then you should contact the MPEG-LA for help on licencing.
On the 27th of August 2010, the MPEG-LA announced (arguably in response to growing WebM support) that the terms of “free use” of H.264 Internet broadcast would not change in 2016. This does not change a thing.
This is similar to Nikon announcing that they will not charge you if you put your pictures up on Flickr, or HP promising that they will never charge you additionally if you photocopy something that you printed on a LaserJet.
Mike Shaver
Using WebM Video
On the 19th of May 2010 Google released the VP8 codec as open-source and royalty free with the full intent to drive broad adoption via industry backing and switching YouTube over to the new format in the long term. “WebM” is a rebranded Matroska container utilising VP8 video and Vorbis audio.
This represents major competition to H.264—Mozilla, Google and Opera have already added support into special builds of their browsers and even Microsoft have about-faced on their H.264-only policy and said that IE9 will support WebM—but only if the codec has been installed by the user. Obviously absent from any support is Apple, and this means that unfortunately codec-fragmentation will continue into the foreseeable future so that you will still need to provide more than one video encode.
Adding a WebM video to Video for Everybody is easy, just add it to the source list! It has to go below the MP4 video due to an iPad bug that ignores anything but the first source element, and ideally above the Ogg source so that browsers that play both Ogg and WebM choose the WebM video first. Here is an example source stack:
<source src="video.mp4" type="video/mp4" />
<source src="video.webm" type="video/webm" />
<source src="video.ogv" type="video/ogg" />
Note the new mime type, which you will have to add to your server.
At this extremely early stage for WebM I will not provide any help via e-mail on how to encode or use WebM video. If you don’t know how to use it already, it’s not for you—wait until support is added to your favourite tools and more information is readily available. I will update this article as the situation with WebM progresses.
================
mobile device video info
The options actually match those of the most recent iPod Video, which uses H.264 video, up to 1.5Mbps, 640 x 480 pixels, and 30 frames per second with low-complexity AAC audio up to 160 Kbps, 48kHz stereo audio. On the lower end, bandwidths up to 768Kbps, 320 x 240 pixels, and 30 frames per second are also used, known as Baseline Profile up to Level 1.3. Both options can be output with .m4v, .mp4, or .mov extensions.
iTunes. The simplest way is to use iTunes built-in converter. Apple makes it fairly simple to convert videos to play on the Apple TV or iPod, which are also conversions that can be used on the iPhone. Any video that can play in iTunes, then, can be converted to play on the iPhone, and local files can also be synced directly to the iPhone via iTunes sync conduit, making for a fairly easy process. Two downsides: first, iTunes uses a "lowest common denominator" approach, meaning that there are no customized options for encoding into H.264. Also, some users have reported a bug in the most recent version of iTunes that creates video files with no audio, so don’t toss your original video clips until you’ve had a chance to test out the new H.264-compressed video clips.
Handbrake. Handbrake is the next most-popular encoding tool for both Windows and Macintosh platforms, and it’s available in a command-line version for Linux. Handbrake does a lot more than just H.264 conversions, but for purposes of this article, Handbrake would be used to transcode an MPEG-2 transport stream or other non-H.264 formats and codecs into H.264 video files. Speed on the product is quite good, and it has the option of a single-profile conversion (like iTunes) or the ability to customize encoding or profiles and then save the tweaks for future encodings. Handbrake has made a name for itself in DVD-to-iPod conversion, so the extension of Handbrake to the iPhone is one that many users trust.
On any of the last three products, the H.264 files output from these products can be added to the iTunes library for uploading to the iPhone. For those choosing to put their iPhone-compliant videos on the web, it’s also helpful to choose hinted streaming to allow the videos to begin playing immediately rather than waiting for the entire cache to fill.
http://www.webmonkey.com/2010/05/embed-videos-in-your-web-pages-using-html5/
So, you want in on the fun? Do you want to use some HTML5 video tags on your site right now? No problem. Fasten your seat belts, as we’re about to take a tour of the wonderful world of HTML5 video.
Browser Support for HTML5
First, let’s deal with some very basic stuff, like where this will work and where it won’t. As you can see in the table below, only the latest versions of most browsers support native video playback using HTML5’s <video> tag.
HTML5 <video> support by browser: Fx 3.0 Fx 3.5 IE7 IE8 IE9 Safari 3 Safari 4 Chrome 3+ Opera 10.5
Since Firefox 3.0 and IE 7 & 8 lack any support for HTML5 video, you’ll have to come up with a fallback plan for serving video to those users. Depending on what you want to do you, could fallback first to Quicktime and then, failing that, to Flash. That’s the strategy used in Video for Everyone (note that as of v0.4, Video for everyone no longer falls back to QuickTime).
To keep things simple we’re just going to fall straight from HTML5 to Flash.
Formats, Codecs and Technicalities
The next thing you need to understand is what is actually happening when you load and play a video file in your web browser. You’re probably used to thinking of video as .mp4 or .mov files, but unfortunately it’s not that simple. The actual file formats are just containers. Think of them as a bit like a .zip file — they hold other stuff inside.
Each container holds at minimum one video track and, most likely, one audio track. When you watch a movie online, your video player (most likely Flash) decodes both the audio and video and sends the information to your screen and speakers.
Why does this matter? Well, because the process of decoding what’s inside the video container file varies. To know how to decode a movie, the player (which is your web browser in the case of HTML5 video) has to know which codec the movie was encoded with.
When it comes to web video there are two codecs to worry about: H.264 and Theora.
There’s a huge debate right now among web developers, browser makers and just about everyone else as to which codec is right for the web. We believe that a free, open codec without patent and licensing restrictions is the best solution for the web. Sadly, neither codec exactly fulfills that dream, so for now, let’s just skip the whole argument and be practical — we’re going to use both codecs.
Why? Well, have a look at the table below, which shows which codecs work where and you’ll quickly see that there is no one-size-fits-all-browsers solution. Only Google Chrome can play both H.264 and Theora.
Codec support by browser/platform: Firefox Opera Chrome Safari IE 9 iPhone Android
Ogg Theora
H.264
So, you may be thinking … if HTML5 video doesn’t work in IE7 or IE8 and it means I’m going to have to encode my videos twice, then why bother at all? Well, the best answer is simple: mobile users. If you want iPhone and Android users to be able to see your video, HTML5 is the only way to do it — Flash support is coming to Android sooner or later but for now HTML5 is the only option, and we all know Flash doesn’t run on the iPhone or the iPad.
The HTML5 Code
Here’s how to actually embed your videos. First, we encode video in both .ogv and .mp4 containers. Encoding video is beyond the scope of this article, so instead we suggest you check out Mark Pilgrim’s online book Dive Into HTML5, which has a whole chapter devoted to understanding video encoding. Pilgrim’s encoding suggestions use free software to get the job done, and in the end you’ll have two files — one .mp4 and one .ogv.
Now it’s time to unleash those movies in pure HTML glory. Here’s the code:
view source
print?
1 <video width="560" height="340" controls>
2 <source src="path/to/myvideo.mp4" type='video/mp4; codecs="avc1.42E01E, mp4a.40.2"'>
3 <source src="path/to/myvideo.ogv" type='video/ogg; codecs="theora, vorbis"'>
4 </video>
Yes, that’s it. What we’ve done here is use the <video> tag to specify the dimensions of our video, and to denote that we want to use the browser’s default controls. Then, within the video tag, we’ve added two <source> elements which link to our video files.
The “type” attribute of the <source> tag helps the browser understand which file it should load. It’s a bit of an ugly chunk of code that needs to specify the container format, the video codec and the audio codec.
In this case we’ve assumed standard .ogv and baseline encoded H.264 video as per Pilgrim’s tutorial. See the WHATWG wiki for more information on which video types you can specify.
And there you have it — native web video, no plugins required.
Dealing With Everyone Else
What about IE7, IE8 and older versions of just about any other browser? Well, for those users, we’ll fall back on Flash. To do that, we just use an <embed> tag within our video tag:
view source
print?
1 <video width="560" height="340" controls>
2 <source src="path/to/myvideo.mp4" type='video/mp4; codecs="avc1.42E01E, mp4a.40.2"'>
3 <source src="path/to/myvideo.ogv" type='video/ogg; codecs="theora, vorbis"'>
4 <object width="640" height="384" type="application/x-shockwave-flash"
5 data="path/to/swf/player.swf?image=placeholder.jpg&file=path/to/myvideo.mp4">
6 <param name="movie" value="path/to/swf/player.swf?image=placeholder.jpg&file=path/to/myvideo.mp4" />
7 </object>
8 </video>
Now any browser that doesn’t understand the HTML5 video tag will just continue on its way until it hits the object tag, which it should understand (note that the order, mp4 before ogv, is important for iPad support — Apple requires that mp4 be the first video file).
Of course for this to work you need a Flash video container. JW Player is one popular example, or you can roll your own using Adobe’s tools. Also remember that we still haven’t handled the case of an older version of Firefox with no Flash plugin installed (maybe your users are surfing your tubes with an outdated Linux machine). You can always add good old text-based links to the video files as a catch-all fix for anyone who can’t, for whatever reason, see either the HTML5 or Flash versions.
Conclusion
Embedding HTML5 video isn’t significantly more difficult than using Flash, especially if you’ve been using H.264 video files in your Flash player — which is exactly what YouTube has done with its HTML5 beta.
While we’re concerned about the licensing and patent requirements of H.264, it isn’t hard to notice that if you skip Theora and make all non-H.264 fall back to Flash, you’ve still saved yourself a considerable encoding headache. In fact, that’s probably the best practical argument against Mozilla and Opera’s refusal to support H.264.
If you’d like to use some of the more advanced aspects of HTML5 video, be sure to check the SublimeVideo player, which offers very nice JavaScript-powered set of custom controls. Also be sure to have a look at Video for Everybody, which makes for more complex code but handles just about every use case you could imagine. And there’s a handy Video for Everybody WordPress plugin as well.
http://camendesign.com/code/video_for_everybody
good luck

How to play HTML5 videos? Please help

So I've used Firefox since ever it came out and now I have problems with playing videos on YouTube because of the HTML5, I currently have Firefox 35.0.1 and I even had 36 but the problem was still there, the only way I found to solve this was to downgrade to 31 since it still uses flash, please help me here, the videos won't play on Firefox but they will play in Internet Explorer.

''John99 [[#answer-691133|said]]''
<blockquote>
May be difficult to sort out if you are on the unsupported Firefox 31 I suggest you upgrade *
If you do need to use Firefox 32 a safer method that works in some cases and in this sort of situation is to use the current up to date secure and supported version (Fx 35.0.1 at the moment), but spoof Fx31 by using an add-on to switch the User Agent String. There is even an add-on but for the opposite problem
* https://addons.mozilla.org/en-US/firefox/addon/youtube-flash-video-player/
Firefox 35 works for me playing Youtube HTML5 videos.
I attach screenshots of
*https://www.youtube.com/html5 offering HTML5, and using HTML5
Click thumbnails for larger image
YouTube has been making changes and may make further changes relating to different Firefox versions and the Flash/HTML options on YouTube. If anything the more likely problem is being offered only HTML and not FlashPlayer.
Another complication, but again the other way round is that due to a series of security patches having been issued recently for FlashPlayer, so users may have old versions of FlashPlayer that Firefox blocks.
===*===
More complicated but it is possible to install multiple versions of Firefox, but you should also use separate profiles for each version. It is something you may consider trying if you need to keep a working Firefox 31 for playing You Tube until you sort out Fx35.
* http://kb.mozillazine.org/Testing_pre-release_versions#Installing_multiple_versions
* http://kb.mozillazine.org/Using_multiple_profiles_-_Firefox
</blockquote>
This is what I get

[Solved] After watching several youtube html5 720p videos, Firefox (version 33) display or screen turns black and aero transparency in windows 7 turns opaque.

Hello ! I just want to share something familiar with that black display or screen occurs for some people. When I watch youtube videos, I used to watch them in html5 720p videos (not flash videos, https://www.youtube.com/html5 ). I upgraded firefox to version 33. No black display when I used it. Randomly and after watching several html5 videos on youtube, aero transparency in my windows 7 turns opaque and firefox display goes all black. Firefox doesn't respond at any command. I need to kill his process in task manager in order to close it. When I open firefox again, normal display goes. To relaunch aero transparency in windows 7, I need to restart the service whose name is, I think, "Desktop Window Manager Session Manager". I use windows 7 in french and the service name is "Gestionnaire de sessions de Gestionnaire de fenetrage".
To solve this, I upgraded my graphic driver but this didn't work. I tried to put "layers.offmainthreadcomposition.enabled" to false in "about:config" menu. No random black display but some html elements turned black for some seconds or definitely when firefox rendered web pages. I tried to uncheck "Use hardware acceleration when available" in options menu. No random black display but html5 720p videos didn't play smoothly.
Then, I chose to watch youtube 720p videos again with flash player and no random black display and html5 720p videos played normally.
Here are my graphic acceleration infos :
Date du pilote 7-2-2014
Description de la carte NVIDIA GeForce GTS 360M
DirectWrite activé false (6.2.9200.16492)
Fenêtres avec accélération graphique 1/1 Direct3D 11 (OMTC)
GPU #2 active false
ID du périphérique 0x0cb1
ID du vendeur 0x10de
Pilotes de la carte nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um
RAM de la carte 1024
Rendu WebGL Google Inc. -- ANGLE (NVIDIA GeForce GTS 360M Direct3D9Ex vs_3_0 ps_3_0)
Version du pilote 9.18.13.4052
windowLayerManagerRemote true
AzureCanvasBackend skia
AzureContentBackend cairo
AzureFallbackCanvasBackend cairo
AzureSkiaAccelerated 0
I hope this will be useful to solve this problem in future versions or to someone.

This is happening to me too, I don't know if this is an Adobe Flash Player 11.5's bug or it's just my computer. All my browsers, chrome, IE9, Fox, doesn't even load anime videos. I tried reinstalling 11.5 many times, it have no effect but I use IE9 64-bit to run the videos that couldn't run. I waited 25 min for a JW player to load an episode of anime and I'm sick of it.

When I try to open a video from the website Youtube I got this message that I didnt before I uograde to Firefox 7.0.1 : "Firefox doesn't know how to open this address, because the protocol (rtsp) isn't associated with any program."

When I try to open a video from the website Youtube I got this message that I didnt before I uograde to Firefox 7.0.1 : "Firefox doesn't know how to open this address, because the protocol (rtsp) isn't associated with any program."
That didnt happen before until I made an upgrade to 7.0.1

Clear the cache and the cookies from sites that cause problems.
"Clear the Cache":
* Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"
"Remove Cookies" from sites causing problems:
* Tools > Options > Privacy > Cookies: "Show Cookies"

I downloaded Newest mozilla yesterday, adobe updated, and now when I click a YouTube video I get a box saying "Firefox doesn't know how to open this address, because the protocol (rtsp) isn't associated with any program." and can't watch any videos?

I downloaded the latest version of Mozilla Firefox yesterday, full and complete, and I am actually using it right now. The only problem I have had is upon clicking any YouTube video, the box pops up saying "Firefox doesn't know how to open this address, because the protocol (rtsp) isn't associated with any program." But there are no directions or suggestions on how to address this problem. Ive looked at YouTube add-ons and none of them really seem related. Upon the finish of the new Mozilla, I also was prompted to upgrade the flash player, and did so without any trouble. I am only guessing this is an extension/plug-in problem. I really am quite confused!

Clear the cache and the cookies from sites that cause problems.
"Clear the Cache":
* Tools > Options > Advanced > Network > Offline Storage (Cache): "Clear Now"
"Remove Cookies" from sites causing problems:
* Tools > Options > Privacy > Cookies: "Show Cookies"

Firefox 9 : html5 video on youtube

Cannot view any short (like less than a minute) html5 videos on youtube. First it doesn't automatically play, then if i hit the play button, it loads forever and doesn't play anything.

I can't remember which video. I haven't watched youtube much but I just did a little testing and it looks fine for now, maybe the lastest update fixed it.
I will post you the vid when I encounter the problem again. Thanks!

Firefox after updating to 37.0.1 doesn't play yahoo news videos ?

After updating to 37.0.1 yahoo news videos are not playing. Youtube/msn videos are working. It did not have this issue before this 37.0.1 update. I tried deleting history, cache etc. completely but it did not help.
I tried the steps described in
Firefox after updating to 37.0.1 doesn't play youtube videos.
https://support.mozilla.org/en-US/questions/1055848
I did reset firefox. It started working but annoyed with pop-up adds. I installed Ad Blocker. It stopped working.
It look like Firefox 37.0.1 does not like some of the add_ons/plugins installed on previous version.
How do I block pop_up adds, malware, tracking etc in Firefox 37.0.1 ?
Why does some videos are working and other are not?
Thanks for helping.

Does it make a difference if you use a Flash based player or a HTML5 media player?
Are you using the HTML5 media player or the default (Flash based) player?
*http://www.youtube.com/html5
Do a malware check with several malware scanning programs on the Windows computer.
Please scan with all programs because each program detects different malware.
All these programs have free versions.
Make sure that you update each program to get the latest version of their databases before doing a scan.
*Malwarebytes' Anti-Malware: http://www.malwarebytes.org/mbam.php
*AdwCleaner: http://www.bleepingcomputer.com/download/adwcleaner/ http://www.softpedia.com/get/Antivirus/Removal-Tools/AdwCleaner.shtml
*SuperAntispyware: http://www.superantispyware.com/
*Microsoft Safety Scanner: http://www.microsoft.com/security/scanner/en-us/default.aspx
*Windows Defender: http://windows.microsoft.com/en-us/windows/using-defender
*Spybot Search & Destroy: http://www.safer-networking.org/en/index.html
*Kasperky Free Security Scan: http://www.kaspersky.com/security-scan
You can also do a check for a rootkit infection with TDSSKiller.
*Anti-rootkit utility TDSSKiller: http://support.kaspersky.com/5350?el=88446
See also:
*"Spyware on Windows": http://kb.mozillazine.org/Popups_not_blocked
*https://support.mozilla.org/kb/troubleshoot-firefox-issues-caused-malware

Firefox doesn't scale YouTube HTML5 videos

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