Try the HTML5 test > The HTML5 test - How well does your browser support HTML5?
You may have the YouTube HTML5 beta enabled.
Opt out here > YouTube
Open System Preferences > Flash Player then select the Advanced tab.
Click Delete All under Browsing Data and Settings
Back to Safari. Press Command + Option + E to empty the Safari cache.
Quit and relaunch Safari, try a video.
Hi Carolyn, thanks so much for the quick and helpful feedback. (I replied yesterday but failed to post before shutting down. [sigh]).
I tried the HTML5 test site you suggested and found that some audio formats are not supported in Safari 6--though the site does say these are bonus features not actual HTML5 requirements.
The dilema is that Safari did work fine with HTML5 until a few weeks ago. Sow why doesn't it now.
As for YouTube, I have no problems with any of their videos, so it's not YouTube issue but HTML5 issue--and one that wasn't there until a few weeks ago.
As for the rest of your suggestions, I'm confused. They appear to address a Flash issue, but Flash is fine--it's HTML5 that isn't playing audio.
Thanks for you help.
Yes, the videos on the Apple support page work fine--but they appear to be MP4, not HTML5.
<video id="" class=" video" type="video/mp4" src="http://movies.apple.com/105/media/us/ipoditunes/itunes/2012/tour/whats-new/itune s-whats_new-cc-us-20130108_640x360h.mp4?width=640&height=360" x-webkit-airplay="allow" width="640" height="360" bgcolor="white" style="width: 640px; height: 360px; "></video>
I was just searching for a solution to this exact problem before posting it here myself.
I am also a regulat Coursera student and had managed to watch and hear the HTML5 option videos without problem.
It must be difficult to visualise for people who aren't signed up to Coursera but not unlike YouTube, there are both Flash and HTML5 versions of lecture videos with inline content often in the form of quizzes (or tests, as we call them in the UK!). However, unlike YouTube, it is possible to change settings on the video page.
Just recently (probably aroung the same time Dominique noticed problems) the audio ceased functioning using the HTML option and the in video content and quizzes stopped using the Flash option.
I reported the problem to Coursera but got a pretty unhelpful response.
Sorry to hear about this, and thank you for letting us know.
We have not had an unusual amount of students reporting issues with the video playback. If its a specific Video, please let us know which one so we can check it. If its the same for all videos on this site, and the problem is slowly getting worse, it sounds like an issue with your browser or cookies and cache.
First, could you please try clearing your browser’s cookies and cache and then let me know if the problem persists? You can find instructions on how to clear various browsers here.
(Link to page which lists the following)
Google Chrome (newest)
Note: Ubuntu users may have to install the chromium-codecs-ffmpeg-extra package to make the videos work in Chromium.
Note: The video speed change feature for lecture watching is not yet supported in Firefox.
Internet Explorer (9 or newer)
Also, could you kindly tell me what happens if you try this in another browser? You can find a list of Coursera’s supported browsers here.
If those suggestions don’t work, would you mind sending me a screenshot of the problem that you encountered? This will help us better diagnose the issue.
I got the feeling from the response that they hadn't read my message properly as it is not really possible to send a screenshot of either missing quiz or audio.
Anyway, for the record, I had already tried disabling extensions etc. and have cleared cookies and cache as Coursera suggested which has not brought the HTML5 audio back.
Every now and then, I do get an in video quiz using Flash but it's only about one in ten lectures. But the problem is extremely fustrating because it means that I have to load the video lectures multiple times (depending on how many quizzes etc. there are to watch the video in Flash until it reaches a quiz then reload it in HTML5 then reload it in Flash until the next quiz etc. etc.