Nuke is not using CPU

#1

Hi CGTalk

I’m sitting with nuke right now, and can’t figure out why my playback in nuke is dead slow. I also seem to have the problem when I’m rendering image sequences out from Nuke.

When I monitor the CPU usage, it’s only about 15-20 % ? :S

Anyone else have had this problem, or does anyone know a possible sollution?

I have checked the priority in Task manager, and it is set to normal.

If anyone could help it would be great.

Thank’s in advance

#2

This is typically a sign of an i/o issue. Though playback is not a cpu intensive operation and would never use all your cpu. What file format are your images and where are the files located(network, slow disk, etc…)?

#3

I’m using .PNG files and they are located on local disc.

#4

Either your disk is slow or fragmented. PNG isn’t a very fast format for sequences as the compression is slow. I would try converting them to OpenExr(Zip1 compression) files for cg images or dpx for footage.

#5

I will try to convert my files to see if that helps me. Thanks very much for the answer so far.

#6

Deke, is there a reason Zip1 scanline is better than the Zip 16 scanline option?

#7

Zip1 tends to be faster because Nuke can randomly access any single lines from the file as needed. With zip16 Nuke has to decode in 16 scanline groups. So if Nuke needs lines 10-18, then it needs to decode 32 lines just to get to those 8 lines because it is between two different groups of scanlines.