jerky preview on video crossover

johnnyboy wrote on 1/6/2012, 3:11 PM
I have not used VMS for a few months but today have this problem
When I crossfade a mpg event the preview is very jerky and almost stops. Audio is OK. Even in draft preview the problem is there. I notice on the windows resource monitor the CPU usage shoots up to 90% while the crossover is being previewed
I'm on windows 7
2.6 dual core cpu
3g of memory.
I never had this problem last time I used the program but now it makes it difficult to edit accuratey

Comments

john_dennis wrote on 1/7/2012, 12:03 AM
Is this MPEG source video the same pixel dimensions and bit rate as all the other video that has worked acceptably for you in the past?

If you start the Task Manager with no applications running are there any processes (like malicious activity) consuming more than a few per cent of CPU? Do you have any other programs running?
ritsmer wrote on 1/7/2012, 2:56 AM
... and are the project properties set correctly?
johnnyboy wrote on 1/7/2012, 10:09 AM
sorry this question should have been in VMS11 but the same happens in that prog anyway. I have no other significant processes running and I'm happy with the mpeg file. I have noticed that if I loop over a crossfaded part of the event and keep repeating the play control after about 6 or 7 times the cpu load drops back to normal and the preview stops being jerky. Very strange!!
musicvid10 wrote on 1/7/2012, 10:14 AM
Not strange at all.
Any time you have a transition, effect, or generated media, you are asking the processor to render in real time, since the video at that point does not actually exist.

Just put a loop over the transition, and pre-render (RAM or file) to see the transition at full frame rate.
Frederic Baumann wrote on 1/9/2012, 1:33 PM
Hi,

BTW, the keyboard shortcut for pre-rendering to RAM is Shift+B.

I have noticed the same issue, even with the same file type for all events. But depending on the launch of Vegas, the issue appears... or not. Sometimes the transition preview is just perfectly fluid, sometimes it is not. Even with the same project file, on the same transition.

Hope this helps,
Frederic - FBmn Software