The video comes up as private.
I can see the video.
Seems a little strange that it happens on output. When did your system begin behaving badly. Was any new software installed recently?
Thank you for asking. The clip that you see, it was made by me last year, when I edited it, it was very smoothly. But recently, I changed my camera to T4i and when I edited T4i clip, the preview screen freeze frequently and it is very difficult for me to edit my project. In the beginning I thought maybe my computer is not fit the T4i format, maybe I need to get some codec.... but until I try to open some old projects that I edited before, most of them has same problem, freeze too. I didn't install any new software.
still try to figure out, CPU usage very high when play the timeline......