MKV's no longer open in QT

Discussion in 'Mac Basics and Help' started by Maury, Feb 18, 2010.

  1. Maury macrumors 6502

    Mar 25, 2008
    1st gen Mac Pro, 10.6.2 fully up-to-date, Perian installed and up to date.

    At some point in the last few months, MKV's will no longer open in QuickTime, in spite of Perian being installed. When I try to open them, QT starts up, but displays a dialog saying "QuickTime Player cannot open files of this type."

    Any advice? I've tried re-installing Perian.

  2. BlueRevolution macrumors 603


    Jul 26, 2004
    Montreal, QC
    I believe you have to open them with the "Perian (open with QuickTime)" application in the Open With menu.

    But with fewer features. VLC also has inferior performance on HD videos compared to QuickTime/Perian on my system, although granted that probably isn't an issue on the Mac Pro. ;)
  3. JediMeister macrumors 68040

    Oct 9, 2008
    Are the files opening in Quicktime X or in Quicktime Player 7 which is an optional install? QuickTime X doesn't work with Perian and some other codec packs.
  4. Maury thread starter macrumors 6502

    Mar 25, 2008
    That is the problem then. I suppose I can use 7, can someone tell me how to do this?

  5. djblaze852002 macrumors newbie

    Jan 27, 2009
    .mkv on Quicktime7

    Snow Leopard moves quicktime 7 to the utilities folder. To make it the default for .mkv files, select a .mkv file, right click, get info, open with "other" and navigate to Applications/Utilities?Quicktime7
  6. dolphindolphin macrumors regular

    May 29, 2008
    New York
    Vlc is satisfactory for most media formats including mkv's but it doest have the fastest encoding ability
  7. Makosuke macrumors 603

    Aug 15, 2001
    The Cool Part of CA, USA
    djblaze852002's instructions only work if you have QT7 installed; it's optional install on 10.6. If it's not there, here's Apple's instructions on installing it:

    On a side note, while I used to be a VLC fan, if you just want to play videos MPlayer OSX Extended has a cleaner interface and on my system uses less CPU, skips around better, handles partly corrupt files better, and handles media served off a slow network connection better. The preferences are also drastically easier to understand, and it has a more Mac-like interface.
  8. polotska macrumors 6502

    Sep 23, 2007
  9. broken-chaos macrumors regular


    Sep 2, 2009
    Toronto, Ontario
    I'd recommend Mplayer OSX Extended as well, for these sort of files. VLC works as well, but I find Mplayer OSX Extended to have a much nicer interface.

    If you have a serious need to play them in QTX, you'll need to install a 'helper' application (just stuff it on your hard drive somewhere), as outlined on Perian's forums. It essentially 'forces' QTX to know that it can play mkvs -- I haven't looked into why/how this happens, I just know it does. :p

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