jlhopes22
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Q: QuickTime no longer plays certain MP4 and MOV files

After upgrading from 10.6 Snow Leopard to 10.9 Mavericks, I've noticed that all the MP4 files taken with my Samsung smartphone no longer play in QuickTime (or with Quick Look), whereas they played just fine in Snow Leopard. The MP4 files use the H.264 codec. Some other MP4s I have, which use the same codec, will play in QuickTime and Quick Look. I've also found some older MOV files (using the SVQ-3 codec) that don't play now.

 

Has anyone else encountered this? Is there any fix, or does it perhaps require an OS update? Since I skipped OS 10.7 and 10.8, I don't know what the situation was there.

MacBook Pro (15-inch Mid 2010), OS X Mavericks (10.9)

Posted on Oct 24, 2013 11:59 AM

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jlhopes22

Q: QuickTime no longer plays certain MP4 and MOV files

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  • by James Williams2,

    James Williams2 James Williams2 Nov 5, 2013 11:15 AM in response to Block Rocker
    Level 1 (1 points)
    Nov 5, 2013 11:15 AM in response to Block Rocker

    I tried to follow the Subler directioins and the app said it was done, but the file didn't change and still won't play the .mov file without 'converting' it.  Is subler supposed to format the file so that it opens quickly in QT as it did before?  I never saw the sheet of paper with the tracks listed on it, so I likely didn't do it correctly.

     

    Could you give me yet another point in the right direction?

     

    Much appreciated,

    C

  • by mjaynes,

    mjaynes mjaynes Nov 5, 2013 11:27 AM in response to James Williams2
    Level 1 (0 points)
    Nov 5, 2013 11:27 AM in response to James Williams2

    Is yours a hinted track issue, do you see hinted tracks when you open the video with Subler?  This is what a before and after look like for me.  I simply selected the hinted tracks, one by one, and hit the delete icon, then File > Save.Before.pngAfter.png

  • by guhhnazp,

    guhhnazp guhhnazp Jan 10, 2014 1:05 AM in response to jlhopes22
    Level 1 (0 points)
    Jan 10, 2014 1:05 AM in response to jlhopes22

    The Reason Why QuickTime Fails to Play MP4 Files


    MP4 is a complex video container with various video and audio codecs. If the video or audio codecs are not the codecs supported by QuickTime, QuickTime won't play MP4 files.

     

    Ideal Way/Solution to Freely Play MP4 Video on QuickTime


    It is simple to solve QuickTime MP4 issue. To freely play MP4 on QuickTime Player, you can convert MP4 to QuickTime compatible MOV, MP4 or other formats with a nice MP4 to QuickTime Converter.

  • by jlhopes22,

    jlhopes22 jlhopes22 Jan 10, 2014 10:45 AM in response to guhhnazp
    Level 1 (0 points)
    Jan 10, 2014 10:45 AM in response to guhhnazp

    The MP4 files I have that do not work in QuickTime X or QuickLook were generated by my Samsung smartphone. I opened one in Subler, and there are no hinted tracks -- there is only an H.264 Video track and an AAC audio track. So WHY doesn't QuickTime play it?

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