As described here if you use the Chrome browser, install YouTube Options and specify the codec as Flash.
By default YouTube options will also change a bunch other aspects of the YouTube interface (e.g., hiding comments, video descriptions, ads, etc.). You may like this, but you may also want to modify some of this plugin behaviour if for example, you like ...
It is most likely an issue specific to your graphics card. Please file a bug at https://bugzilla.mozilla.org/enter_bug.cgi?product=Core then choose the video/audio component. Paste in the information from about:support and the right people will get notified and will jump onto it immediately.
Right-click the video when it is playing or not and the context menu that pops up will tell you if you are using Adobe Flash Player or the YouTube HTML5 Video Player.
This is the right-click menu for the two cases:
In Firefox 36:
Google Chrome 41.0:
You can find out if you are using YouTube HTML5 Video Player as the default player for playing YouTube ...
YouTube is changing the player from time to time, and they indeed removed the ability to like a video both in embeds and in full screen. There is no toggle or option or anything to bring it back, at least not via YouTube-native features.
I don't know the reasoning behind it, though if I had to guess it's because nobody used this feature, unlike the watch ...
Google Apps Script could be used to create forms, to add custom features to the Google Forms editor, to submit responses automatically and to do things on form submission but it could not add features to published forms like the embedding an HTML5 canvas.
The HTML you're adding is sanitized by the Google Caja Compiler. It will check the embedded code for malicious code, and remove the parts that don't fit.
Google Caja Playground
Landing site Google Caja
Google Sites HTML box
Here is an extension that forces Flash on YouTube (tested on 02/05/2015).
Also, to remove the annoying fullscreen message type in the address bar: chrome://plugins/, find: "Adobe Flash Player" and check the box next to Always allowed.
I had this problem but like you lot all the fixes on the web either are payed for or ffmpegsumo.dll always comes back after a period. I have now fixed mine permanently and here is how I did it.
This is for a Windows based Computer
Find the ffmepegsumo.dll you should all know where it is located.
Right click on it and Choose properties then Choose the ...
I found a solution here: https://groups.google.com/forum/#!topic/mozilla.dev.extensions/0ZgKDAFfUDc
Here's how I disabled HTML5 video in Chrome on Windows:
Find the file called ffmpegsumo.dll where Chrome is installed (C:\Program Files (x86)\Google\Chrome\Application\30.xxxxx\ for me)
Worked for me as well, but after a while the html5 player returned. ...
You can use the YouTube Options extension for Chrome:
Update (2014-04-12): the YouTube Options extension for Chrome now costs $2:
"YouTube Options" cost $2.00 per month, below is a copy of the user agreement one has to confirm prior to using it.
This extension is based on a paid subscription model. It costs a flat
fee of $1.99 per month, with half of ...
Try deleting your Flash cookies. http://macromedia.com/support/documentation/en/flashplayer/help/settings_manager07.html
I had the same issue, in fact I just came here because I was googling for a solution. I noticed that videos that would play in HTML5 on Chrome would play in Flash in Firefox even if I was signed in to Youtube on both browsers so I figured ...
The best advantage of HTML5 of YouTube player is compatibility with Android devices. When the user click the player to watch a video, no need to skip to YouTube App. Just embed and watch the video within the page, no Flash problems. At PresentationTube, we use HTML5 to allow mobile users watch the video within the page the same as the desktop.