Previous 1 2 Next 17 Replies Latest reply: May 23, 2013 10:40 AM by NannyMian
bradhotdog Level 1 (15 points)

This has nothing to do with an iphone, and ipod or an ipad. My Macbook Pro running Lion 10.7.2 will not open or play .mp4 files any longer.


I've tried opening it in quickview and it shows up as a black screen that never plays.

It does the same when i open it with Quicktime X.


If i try opening with Quicktime Pro 7, it says 'The movie contains some invalid data' 'The movie could not be opened'.


someone please help me, i don't know what's going on, and i'm a video editor, so i need to be able to work with these files like i have been for the last few years

Macbook Pro, Mac OS X (10.7.2)
  • andyandywells Level 1 (105 points)

    Try VLC Media Player. It plays millions of file format. If this does not work, then the video you are trying to play must be corrupt, VLC is the ULTIMATE media player, playing literally every single format.

    Despite Quicktime being able to open .MP4 the file may contain data that does not agree with the .MP4 format. Give VLC a go, hope it works!

  • bradhotdog Level 1 (15 points)

    does not help. my macbook pro was capable of playing .mp4 files since day one. I'm not going to download VLC player to substitute for my computer not working properly. i want to try and fix my computer, not deal with it.

  • andyandywells Level 1 (105 points)

    If VLC cannot play the files then there must be a problem with the computer.

    I am not advising you deal with it, it is a suggestion.

    Do any other .mp4 files work or just one?

  • bradhotdog Level 1 (15 points)

    VLC will play the files.


    it's a problem with all .mp4 files on the comptuer.


    Also, i saw that on apple's website they say to restart your computer holding down Command R for recovery mode. This did nothing to my computer when i did it. it just restarts my computer as normal.

  • andyandywells Level 1 (105 points)

    Quicktime may need additional codecs.

    Have they worked on Lion before?

    Or just the previous operating system?


    I have done this before, i shut down my mac, then pressed the power button, command, and r, at the same time and held for 3 seconds, then released all together.

  • bradhotdog Level 1 (15 points)

    i hope quicktime doesn't need additional codecs, or else that means they have self destructive codecs that stop working after a certain amount of time, cause it's always worked.


    i've been on Lion since day one.


    idk what or why, but holding down command r when restarting does absolutly nothing for me. i figured at least in the recovery mode i can make it download stuff that may have been deleted or messed up on my computer, but now i can't even get to that.

  • andyandywells Level 1 (105 points)

    Where are the MP4 files from?

    Is there a possibility you email them to me and I will be able to see if they work on my Macbook Pro?


    You don't restart the machine, you must shut it down and turn it on using all three functions.

    Try removing quicktime and re-installing it.

    Ensure that quicktime is completley erased, use App Zapper or similar, it will erase all similar files.

  • bradhotdog Level 1 (15 points)

    i can dropbox it to you. it's about 107MB


    and i don't restart the computer. i shut it down completely and i've tried pressing down Command R and the power button all at once and holding Command R down after letting go of the power button


    i've also tried holding down command and r and while they are pressed down, then i press the power button.


    none of these tedious combinations have worked.


    what's your email and i can send you the file once i have it up on drop box.

  • andyandywells Level 1 (105 points)

    Another site has said that shift and the power button should work..


    I will try various combinations, now and reply


    < Email Edited By Host >

  • OrangeMarlin Level 5 (5,145 points)

    Andy, it is absolutely not safe for you to post your email address or to request something be sent to you.  In addition, your recommendations about Quicktime are incorrect.  I would suggest you spend time learning about your answers before making broad comments.  Quicktime is missing the codecs that he needs, and the OP is ranting about it, what are we supposed to do.


    The problem lies with the mp4 file, and how it's been manipulated.  The OP has refused to provide accurate information about the issue, it's time to move on. 

  • OrangeMarlin Level 5 (5,145 points)

    I've requested that Apple remove  your post.  You shouldn't post private information.  You should also review the Terms of Use.

  • andyandywells Level 1 (105 points)

    I have stated that quicktime may be missing the codecs.

    I do not need to spend time 'learning'.

    MP4 worked fine before for him.

    And my profile contains my email adress so my private information is shared.

    I d not apreciate your 'Know it all' approach.

    I am simply trying to help another user.

  • andyandywells Level 1 (105 points)

    I have tried the option key when turning the power on. Select recovery HD, this should be recovery mode

  • bradhotdog Level 1 (15 points)

    First off, who is OrangeMarlin, and what is going on?


    Secondly, here's the public dropbox link...



    Thirdly, what is going on?

Previous 1 2 Next