NEW - Quicktime not opening .mp4 files

I posted this in another topic, but want it to be seen.
I am having a similar problem. .mp4s are not playing. Used Handbrake to create an .mp4 file. It plays fine on every system but the one I need it to play on. Quicktime 7 won't play any video, just a white screen like it is missing a codec. I haven't had this problem before, and nothing has been recently installed that would effect Quicktime. Is there an easy way to reinstall the codecs? I've reinstalled Quicktime several times with no effect, recreated the .mp4 file several times, everything else plays fine. The .mp4 plays in Compressor, iTunes, and, oddly enough, Full Screen mode in QT player, but not in the regular mode. Any ideas?

These are the downloads and the settings you need in order to view/hear pretty much everything:
Assuming you already run OS 10.4.9 or above and have Quicktime 7.2, and are using Safari 2 or 3, download and install (or re-install even if you already had them) the latest versions, suitable for your flavor of Mac, of:
RealPlayer from http://uk.real.com/player/
Flip4Mac WMV Player from http://www.microsoft.com/windows/windowsmedia/player/wmcomponents.mspx (Windows Media Player for the Mac is no longer supported, even by Microsoft)
Perian from http://perian.org/
Adobe FlashPlayer from http://www.adobe.com/shockwave/download/download.cgi?P1ProdVersion=ShockwaveFlash
In Quicktime Preferences, under advanced, UNcheck Enable Flash, and under Mime settings/Miscellananeous only check Quicktime HTML (QHTM).
In Macintosh HD/Library/Quicktime/ delete any files relating to DivX (Perian already has them).
Now repair permissions and restart.
The world should now be your oyster!
You should also have the free VLC Player from http://www.videolan.org/ in your armory, as this plays almost anything that DVD Player might not.

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Quicktime is not opening .mp4 files anymore

Hi, my quicktime stopped opening .mp4 files I record with my cellphone, that's pretty strange because I thought it was a problem with the phone but I can open them everywhere but in my Mac. This happen after I updated quicktime.
Does anybody knows what could it be?
Thanls

I am having a similar problem. .mp4s are not playing. Used Handbrake to create an .mp4 file. It plays fine on every system but the one I need it to play on. Quicktime 7 won't play any video, just a white screen like it is missing a codec. I haven't had this problem before, and nothing has been recently installed that would effect Quicktime. Is there an easy way to reinstall the codecs? I've reinstalled Quicktime several times with no effect, recreated the .mp4 file several times, everything else plays fine. Any ideas?

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After I've upgraded to Lion, QuickTime stopped playing .avi movies.
I've Perian codec installed and I've tried to disable it and both with it enabled or disabled QuickTime does not work.
Moreover, I've another problem: after having selected the option "open this file always with VLC" the system is still not working properly since it keeps opening .avi videos with QT.
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Hi,
Remove Perian and restart.
Remove FlipFor Mac and restart (you are ?).
Install Perian and restart.
In Perian prefs plane : "desable" Load external subtitle
Work for me ! Good Luck.
Latest Version 2.3.8.1 not support OSX Lion
Intel or PowerPC G4 & G5
Mac OS X 10.4–10.6*
Note: Support for Mac OS X 10.7 Lion coming soon
QuickTime 7 or later
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Today I hooked my computer to my LCD Tv and wanted to watch one of the .mp4 movies I had on my storage hard drive.
I had to install iTunes and quicktime again, so I did that.
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I try different programs until I try Firefox and IE. The video and sound works there. but i cannot get it fullscreen.
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Message was edited by: bambam922
Message was edited by: bambam922

Do the files on the hard drive have the QuickTime icon?
What menu option do you have when you right click on the file? Can you choose to "Open With" and pick QuickTime Player?

Quicktime not opening AVI files in Lion.

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divx might interfere with perian because perian already covers divx and xvid. Only one solution, not both..
simply uninstall every 3rd party codecs you have installed and go with just one if there are more then one to choose from.
Perian and WMV ( flip4mac ) is all I have on Lion and it plays everything, even downloaded youtube videos ( flvs ), the videos my Samsung mobile phone makes and the strange encoded avis that my sister sends me via email from her vista machine.

I would like to be able to edit MP4s in CS5. I can not open the file. What am I missing?

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I have videos that I have captioned that will not open correctly on other computers (in QT), besides my own. I have added captions as a text track and made adjustments to their positioning on the screen. When others open the QT files from another computer, you can either just see the text track and the movie is a white box, or QT will simply not open the file stating this is not in a format that QT understands.
I noticed there is additional codecs listed with these problematic files, specifically VP6F, MPEG Layer 3, Text codecs.
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Your files are MPEG-2 and you need additional software to view them in QuickTime:
http://apple.com/quicktime/mpeg2
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http://www.apple.com/downloads/macosx/video/mpegstreamclip.html

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https://discussions.apple.com/docs/DOC-2494

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In a message dated 4/9/2015 9:13:48 A.M. Eastern Daylight Time,
[email protected] writes:
reloaded Photoshop CS5 (New Machine) and now it won't open, geta message
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created by c.pfaffenbichler
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(https://forums.adobe.com/message/7421714#7421714)

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NEW - Quicktime not opening .mp4 files

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