11 Replies Latest reply: Oct 5, 2013 2:48 PM by Alf Megson
dominique99 Level 1 Level 1 (0 points)

I used to be able to play HTML5 videos in Safari without a problem--but as of the past week or so, I get no audio. I did a couple of courses through Coursera this summer and the HTML5 videos worked fine. But now that I've started new courses, I have to use Chrome (which I don't like) or use the Flash versions of the video which are not as good. Anyone else encountering problems with HTML5 videos audio?


I've seen older posts about Safari not playing nice with Youtube HTML5s; but that's a long time ago and my Safari was working fine with HTML5 until the last week or so.



Screen Shot 2013-09-04 at 10.46.30 AM.png


My MacBook Pro is mid-2012 and running : OS X 10.8.4 (12E55)

MacBook Pro (13-inch, Mid 2012), OS X Mountain Lion
  • 1. Re: Safari 6 lost audio in HTML5 videos
    Carolyn Samit Level 10 Level 10 (89,590 points)

    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.

  • 2. Re: Safari 6 lost audio in HTML5 videos
    dominique99 Level 1 Level 1 (0 points)

    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.


    Screen Shot 2013-09-05 at 7.00.30 AM.png


    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.

  • 3. Re: Safari 6 lost audio in HTML5 videos
    Linc Davis Level 10 Level 10 (117,870 points)

    From the Safari menu bar, select


    Safari Preferences Extensions


    Turn all extensions OFF and test. If the problem is resolved, turn extensions back ON and then disable them one or a few at a time until you find the culprit.


    If you wish, you may be able to salvage the errant extension by uninstalling and reinstalling it. Its settings will revert to their defaults. If the extension still causes a problem, remove it permanently or refer to its developer for support.

  • 4. Re: Safari 6 lost audio in HTML5 videos
    dominique99 Level 1 Level 1 (0 points)

    Thanks Linc. I tried turning off all extensions, but still no audio for HTML5. What has me stumped is that audio in HTML5 videos used to work, but it doesn't anymore. ??

  • 5. Re: Safari 6 lost audio in HTML5 videos
    Linc Davis Level 10 Level 10 (117,870 points)

    Is sound working in any application? Can you hear the videos on this page:


    Apple - Support - Videos

  • 6. Re: Safari 6 lost audio in HTML5 videos
    dominique99 Level 1 Level 1 (0 points)

    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>

  • 7. Re: Safari 6 lost audio in HTML5 videos
    Linc Davis Level 10 Level 10 (117,870 points)

    HTML5 video is not a format. It's a way of embedding video in a page without plugins. The page I linked to has HTML5 video content. If you can post a link to a public page that you're having trouble with, please do so. Otherwise use one of the workarounds you've already found.

  • 8. Re: Safari 6 lost audio in HTML5 videos
    dominique99 Level 1 Level 1 (0 points)

    Can you access this link?




    The audio works in Chrome, but not Safari.

  • 9. Re: Safari 6 lost audio in HTML5 videos
    Linc Davis Level 10 Level 10 (117,870 points)

    Can you access this link?


    Not without a password, and please don't post that. I'm convinced that the site is using a video format that Safari doesn't support. There's nothing you can do about it. Before anyone tells you otherwise, installing plugins won't help at all.

  • 10. Re: Safari 6 lost audio in HTML5 videos
    andyBall_uk Level 7 Level 7 (20,320 points)

    That video has sound here in both Safari 6.0.5 on 10.8.4 & in Safari 5.1.9 on 10.6.8. It also plays in Quicktime X & shows as H.264, 960 x 540 AAC, 48000 Hz, Stereo (L R)

  • 11. Re: Safari 6 lost audio in HTML5 videos
    Alf Megson Level 1 Level 1 (85 points)

    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.

    From Coursera:


    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.


    Firefox (23)

    Note: The video speed change feature for lecture watching is not yet supported in Firefox.


    Safari (newest)


    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.