Quicktime won't play on Safari or Firefox?

Recently I have noticed that I cannot play Quicktime movies from the Apple Movie Trailers website. All I seem to get is a blue Quicktime icon with a white question mark. Or when I try to download a movie trailer from the site it states I have a incorrect url?
The problem seems to have only recently developed? I have managed to play movies in those web browsers previously without any problems. When I play a saved Quicktime movie it plays without any problems. I am using Quicktime 7.6.4.
Looking at the previous discussions I have updated my Quicktime, Flipmac, Perian and Flash applications. Tried moving the QT plugins to my users plugins folders but to no avail?
Not sure what the problem is but it's driving me crazy and I'm sure previously I didn't update any software apart from Firefox? Firefox is 3.5.7 but the applications refuses to work in Safari as well?
Does anyone have any advice? Not sure I want to reinstall any OS X? Though I have heard people that restored their permissions have managed to get it working? Can anyone explain what that does and does it erase apps and files?
Thanks

Though I have heard people that restored their permissions have managed to get it working? Can anyone explain what that does and does it erase apps and files?
Repairing permissions is important, and should always be carried out both before and after any software installation or update.
Go to Disk Utility (this is in your Utilities Folder in your Application folder) and click on the icon of your hard disk (not the one with all the numbers).
In First Aid, click on Repair Permissions.
This only takes a minute or two in Tiger, but much longer in Leopard.
Background information here:
http://docs.info.apple.com/article.html?artnum=25751
and here:
http://docs.info.apple.com/article.html?artnum=302672
An article on troubleshooting Permissions can be found here:
http://support.apple.com/kb/HT2963
By the way, you can ignore any messages about SUID or ACL file permissions, as explained here:
http://support.apple.com/kb/TS1448?viewlocale=en_US
If you were having any serious problems with your Mac you might as well complete the exercise by repairing your hard disk as well. You cannot do this from the same start-up disk. Reboot from your install disk (holding down the C key). Once it opens, select your language, and then go to Disk Utility from the Utilities menu. Select your hard disk as before and click Repair.
Once that is complete reboot again from your usual start-up disk.
More useful reading here:
Resolve startup issues and perform disk maintenance with Disk Utility and fsck
http://support.apple.com/kb/TS1417?viewlocale=en_US
For a full description of how to resolve Disk, Permission and Cache Corruption, you should read this FAQ from the X Lab:
http://www.thexlab.com/faqs/repairprocess.html

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Quicktime won't play on Safari on Apple Troubleshoot page. Firefox OK.

When I go here on Safari:
http://www.apple.com/quicktime/troubleshooting/
I do not get a Quicktime Logo. When I go there on FIrefox, I get the logo. I can play the Apple trailers on Safari. I have a problem with some streaming (RTSP) sites elsewhere (on safari not firefox).
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I reinstalled QT7 from the install disk and rebooted but the problem still occurs.
Above response was to get QT 7 to install -- not to fix QT RTSP which, in my opinion is non-functional at this time under Snow Leopard. Basically, the "logo" you see on the "Troubleshooting" test page is just the animated "buffering" logo. If you want to see what the real spiraling "animated logo" looks like, then view the same test page under Tiger or Leopard OS.
About the only other thing you can currently do is reset the RTSP "transport" settings but this did not fix things on my system:
If you're using QuickTime X on Mac OS X Snow Leopard:
1. Quit QuickTime Player if it's running. Open the Terminal application which is located in the Utilities folder.
2. Cut and paste the following command into the command prompt and press the Return key:  qtdefaults reset TransportSettings
3. You should see the following message displayed in the Terminal window: "Quicktime has been configured to automatically determine the best protocol and port for streaming."
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The HTML is simple...
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http://www.pbs.org/wgbh/nova/elegant/media2/eu.mov
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Videos won't play in Safari. Notice says, "You need to upgrade your Adobe Flash Player to watch this video." I have downloaded it, but no change. All videos play OK in firefox, but I like the controls in Safari better and want to stay with it.

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Try deleting Flash cookies.
Flush.app – Flash Cookie Removal Tool For OS X | MacHacks.TV
If that doesn't help, UNinstall the old Flash plugin first, then reinstall new.
Troubleshoot Flash Player | Mac OS
Then restart your Mac.

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Yes, same thing here. I received an email on my iPad with a direct link to a MobileMe gallery movie page. Click on the link and Safari opens just fine, and shows the first image of movie and the text, but no spinning, never loads, can't play.
I know you're supposed to use the MM Gallery app... but... what about those iPad users who don't have MobileMe, but are just redirected by an email link - they could download it, but wouldn't know that.

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I recently purchased QuickTime 7 Pro to convert avi files to mov files for editing on Imovie. However, QuickTime won't play the files. How can I get them to play and how can I convert them to mov files?

I recently purchased QuickTime 7 Pro to convert avi files to mov files for editing on Imovie. However, QuickTime won't play the files. How can I get them to play and how can I convert them to mov files?
Both the AVI and the MOV file extensions refer to the file container and not the compressed data the file contains. Both are generic file containers in that each may contain any valid combination of audio and/or video data that is compatible with the codec component configuration of the system on which the file was created. On the other hand, whether a file is playback compatible, conversion compatible, and/or edit compatible depends on the data actually contained in the file container. So, you are basically dealing with two separate issues here—the container and what is inside it.
Basically, if you want to make your files ediit compatible with iMovie, you must change your file container to one that is acceptable to iMovie and convert the data to edit compatible audio and/or video compression formats as may be necessary. The best approach is to determine what codecs were actually used to create the original AVI files and add them to your system if possible. In most cases a codec package like Perian can be added to your system's codec component configuration to may the AVI file playable. Once they are playable, in the QT 7 app then they can be chnged or converted to file types and compression formats that can be edited in iMovie. (While Perian handles most codecs commonly used to create AVI files, it does not handle all possibilities and, while the Perian codec package still works under cureent Mac OS versions, its development group has decided to drop further development/support of the package.)
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How do i change my quicktime player default back to quicktime 7 as my new quicktime won't play certain formats

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Embedded audio file won't play in Safari

I'm trying to plan an embedded audio file in safari, but it just never loads. Similar files on the same page are marked 'Flash 9 is required to listen to audio' - I have listened to these files before without any problems.
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Any suggestions?

You will really need to upload it if you want someone to help you troubleshoot the problem. It could be any number of reasons.
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Quicktime won't play my .mov files, even those from an iPhone, since I installed Mavericks. "Tell Me More" doesn't tell me anything about a solution. Any suggestions?

What do I do?
Frankly, if you have deleted the original movie clips from your camera/camcorder and iPhoto, then it sounds as if you are up the proverbial creek without a paddle and there is nothing further that you can do.
Some facts:
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640 x 480
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I have a MAC running Maverick. MP3 sounds will not play in Safari or FireFox, but will play if you download the file locally to the Desktop. How to resolve this?

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/Library/Internet Plug-ins and
~/Library/Internet Plug-ins
(~/Library is hidden by default. Let me know if you don't know how to access it.)
My internet plugins were all in /Library; there were none in ~/Library.
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They it will be trial and error to see which plugin is responsible.

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It's bad design to put more than one movie on a page. Even my local cinema knows that.
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Hi,
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I've fiddled with different settings in the Quicktime and my Internet Options, but nothing seems to work. I am by no means good at that sort of thing, so I hope I didn't mess anything up further.
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The settings on firefox were fine. It turns out that I had to change my code from object top embed. That worked and got the video to play in firefox. But ironically now the sound only sometimes works in firefox. If it is not one problem it is another. lol If you have any insight you can share it would be greatly appreciated.
Thanks man.

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I searched what that was - and the answer is no. I added the video file as follows: Insert>Media>FLV>browse, etc... used the first skin they gave me.
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Quicktime won't play on Safari or Firefox?

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