How did you go about transferring the Premiere Elements 12 project on Windows 7 64 bit to Premiere Elements 12 on Windows 8.1 64 bit.
Therein is what I believe is your problem. You in all likelihood do not have a codec problem of any kind, rather Premiere Elements 12 project on Windows 8.1 64 bit with disconnect between it source media and the project file. Here is how it goes.
When you import a file into Premiere Elements project, what you have in Premiere Elements is a copy of the original which is still at its hard drive save location. But the project must trace back to that original on its hard drive save location.
You may have the project.prel (project file) opening in Premiere Elements 12 on the second computer, but what I suspect to be the case is that you do not have the project media on that second computer.
If so....On the first computer, archive the project with File Menu/Project Archiver and its Copy Project option. Transfer the resulting saved Copied Folder to a USB Flash Drive which will be used to transfer the Copied Folder to the second computer. In the second computer, open the Copied Folder, right click the project.prel file in the Copied Folder, select Open With, and then Premiere Elements 12.
Did you set up disc menu in the Premiere Elements 12 Windows 7 64 bit project?
Please review and consider the above and let us know if any or all of that applies to your situation.
I have followed your instruction above when I try to copy a project from a Vista 32 bit computer to Windows 8.1 computer using Premiere El 10. It looks fine until I start playing on the timeline. The first picture shows all the time and the sound is working but the videos do not show.
Important first question....does your Windows 8.1 computer use a NVIDIA GeForce video card/graphics card? If the answer is yes, that will be bad news because of the Premiere Elements 10/NVIDIA GeForce issue whose solution is to roll back the driver version to about May 2013. Often this fix is not possible in Windows 8 and 8.1 64 bit since the driver
versions available for those operating systems do not go back earlier enough.
Please see Announcement at top of this forum and/or check out the following
We can explore other answers if your Windows 8.1 64 bit computer with Premiere Elements 10 does not use a NVIDIA GeForce video card/graphics card.
Looking forward to your follow up.
I have NVIDIA GeForce GTX745 and driver 184.108.40.20670.
Is there the same issue for Premiere Elements 12?
This Premiere Elements 10/NVIDIA GeForce issue has been very specific for Premiere Elements 10.
Premiere Elements 12 or 13 should not be running into this issue. But, always best to evaluate the tryout before purchase to assure compatibility with your computer and your project goals.
Please let us know the outcome when you get a chance.