On my admittely low-end (- WinXP Pro - 1.2g / 256meg - GeForce 4 MX 420 / 64mb) p.c. the sequence editor image preview brings my machine to it’s knees. Just clicking anywhere in the sequence editor strip view brings up
an hourglass for at leat 3-5 seconds.
This is the same for 2.41 released and the latest CVS. and CVS/FFMpeg.
I wonder if this is particular to my machine (video card) ?
Also when playing the animation (alt-a_, the test animation
just shows the white-plane moving in 3 steps - bottom left corner
middle of the screen, and top left corner.
Interestingly, when I start the playback using the timeline, the
playback is still extremely slow, but the playback advances by
two frames at a time at approx 1-2 fps.
I even reduced the SizeX, Sizey down to 40x30, and the animation still won’t play smoothly in the preview window.
I tried it on my Winblows XP Home 2Ghz 512MB RAM with an ATI RADEON x600 126MB video card.
The alt-A gets me a jumpy white square (with fringes?). The play button creates a jumpy first run then smooth repeats. Clicking the sequence editor goes frame to frame without a pause. Hope that helps.
As I understand it, when playing a movie file the computer only deals with the pixels that change from frame to frame. In this simple test you have a large white square move across a blue background. The sqaure is so large, it takes up so much of the frame, that playing the resulting movie means having to process a large percentage of the pixels for every frame. Add to that the stark contrast and the eye can see every little jump or jagged edge.
In other words: this may not be the best test of your computer.
With that said, I got the speedy little square up to 640x480 before it became what I would call unacceptable.