QT 6.5.2 opens these MP4 videos, but QT 7.4.5 cannot

I have a set of videos I downloaded from the Internet in MP4 format. I expect they were extracted from a set of DVDs with HandBrake or something similar. Most of them open and play fine in QuickTime (7.4.5), but two do not; QuickTime says "The movie could not be opened. The movie contains some invalid data." (Nor will iTunes open them.) I thought it might be a Perian problem, so I removed Perian, but that didn't help. RealPlayer apparently uses QuickTime to play MP4, so it couldn't open them. So I tried them on my PowerBook G3, with 10.3.9 and QuickTime 6.5.2, and they opened just fine! Odd that an old version of QT can handle them, but the latest can't? They also open and play fine in VLC. I know very little about video stuff; does anyone have an idea how these videos might be "cleaned up" (without losing any quality) using QT 6.5.2 or VLC (or something else) so they will open in QT 7.4.5?

Well, what's odd is (1) these are two videos out of a set of 15, all converted from DVD to MP4 by (I presume) the same person (probably in Windoze); the other 13 open fine in QuickTime but these don't; but (2) they do open in QuickTime 6.5.2. And they open in VLC, but it's annoyance having to use a different viewer for two out of the set of 15 -- especially since I plan to pass this set on to a non-computer-expert friend or two (they're EFT training videos). Fortunately, I've found both at YouTube, whence I can download them and convert them to MP4 to complete the set.
Thanks for your response.

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Hi,
To downgrade your OS, follow these instructions:
How to Downgrade Your Blackberry OS
1. Make sure you have Blackberry Desktop Manager (BDM) installed on your computer. You can download it for free at http://na.blackberry.com/eng/services/desktop/ for PC or Mac.
2. Download the OS you wish to downgrade to and install that file on your computer. It will integrate with BDM.
3. Backup your contacts, settings, and personal files on your Blackberry with BDM. This will save you from losing your contact list and other personal information.
4. To begin the downgrade process, start BDM with your Blackberry attached to your computer via the supplied cable.
5. Once BDM has started and you are at the main screen, click on Application Loader and then Update Software.
6. After the BDM reads information from your Blackberry, you will be presented with a list of available updates. Select the version you wish to install by checking the box next to the version and click Next.
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bertjones00 wrote:
It reads other DVD's just fine. I've tried playing commercial DVD's and homemade movies and they all work just fine. I'm also able to create and read data discs with no problem. I'm only having trouble playing this one particular DVD movie. I'm able to play the movie in my PS3 with no problem and can play it in a regular HDMI DVD player. I'm not sure if my computer doesn't recognize the encoding for the movie or if I need to download another type of software to play the movie. Someone suggested that i try using PowerDVD to see if it could play the movie.
Ok then tell me this what is that DVD your having problem watching then? And what Region Code are you from like Euro is Region 2 and so on??? Could be the Region problem on the DVD doesn't match your drive Region as well?
I am a Volunteer to help others on here-not a HP employee.
Replies aren't online 24/7 because of Time Zone differences.
Remember in this Day and Age of Computing the Internet is Knowledge at your fingertips if you choose understand it. -2015-

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Hi, I'm new to apple discussion forum, I have been searching for answer to my problems but couldn't find the resolution.
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For now I set iTunes to be the default program to open for this file type but would it rather have remained Quicktime.
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Message was edited by: Duddo

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QT 6.5.2 opens these MP4 videos, but QT 7.4.5 cannot

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