What model of camcorder is this video coming from and what resolution is it?
Have you manually gone to Windows Update to ensure you have ALL of the updates, including those that don't install automatically.
Have you ensured you have the latest version of Quicktime, per the program's requirements?
What processor do you have and with how much RAM? How much free, clean, freshly defragmented space is on your hard drive?
Are you sure your .MTS files are 6 to 13 megs in size? AVCHD is about 750 megabytes per minute. That would make a 6 megabyte video file about half a second long.
Here is answers to your questions:
It is Sony 440. I copied all video files to the hard drive. Resolution Full HD 1080i 30. All Window updated are installed.
I do not have QuickTime and I do not need it since I am not an Apple person.
I have Intel i7 processor and 24 GB RAM. I have 1.4 TB free, clean space on my hard drive.
MTS files are different in size. I have checked property of the individual files in the project. They are all different. Some of them 30MB, some 12, some 6.
As I said, I tried to add 3 relatively small files and even then I run into problem.
The program does require Quicktime in order to be fully functional and to edit AVCHD video. It has nothing to do with whether or not you are an Apple person.
I would recommend that any video you plan to edit in Premiere Elements be shot with the camcorder full AVCHD 1080i (FX or FH mode).
Install Quicktime, shoot some video in your camcorder's FX mode and see if you get better results using the FX mode video only.
Following your recommendation, I have installed the latest version of QuickTime from the Apple website. I always shoot my videos in FH mode and I am very satisfied with the quality.
I tried again to add video files to the project after I installed QuickTime. Still the same problem: the Add Media pop-up freezes with 'Not Responding ' message.
You've got something going on, but I can't tell what, Levalt. Maybe someone else will have a suggestion.
If you are shooting in AVCHD and your computer is properly configured, the program should be able to edit your video without even working up a sweat.
It is a puzzle that somehow needs to be solved.
I have been using Premiere Elements 11 for years and had never experienced problems adding more video files to the project even for projects with more than 1 hour running time.
This particular project is as of now 45 minutes. I need to add more video files to it and I can't do it...
Maybe some of Windows 8.1 updates messed it up?
Maybe if I upgrade Windows to Windows 10 this problem will go away?
Also if I upgrade PE 11 to PE 14 will I be able to continue working on the project created in PE 11?
I am thinking that PE 14 may won't have this video adding problem....
Meantime, you can try something.
1) Shoot video in FX mode.
2) Attach your camcorder to your computer via USB and use Premiere Elements' Add Media/From Flip or Camera (the Video Importer) to get the video files from the camcorder to your computer.
3) Add the video that appears in the Project Assets panel to your timeline.
It's just a test. But I still think there's something a little suspicious about those tiny video files. This workflow will ensure that the video files you're adding to your timeline are actual high-def video files and not thumbnail preview files or something like that.
The problem was just in a single video clip. Add Media couldn't digest this clip for some unknown reason.
When I took off this clip from the load, I was able to add as many clips as I needed to the project with no problem.
It is interesting that I was able to run the rejected video clip using Windows Media Player and it looked just fine.
It is a mystery why Add Media did not like this particular video clip out of 2,500 video clips in the project.
Great news, Levalt! Please mark this question as answered.