CPU at <40% during video rendering - where is the bottleneck?

S

seanspotatobiz

Member
If my CPU is less than 40% occupied during video rendering, what can I investigate in my system in order to speed up the process? Could it be my HDDs or my memory?

System drive: Maxtor Diamondmax 22 500GB SATA-II 32MB
Video files: 2 x Maxtor DiamondMax 10 6B160M0 160GB SATA-150 8MB = RAID 1
 
Kornowski said:
Perhaps the video doesn't need more than 40% of your CPU to render. Is it HD? What program are you using?
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Hey. The video is HD.

With VirtualDub 1.9.9, the CPU is at less than 40% and with Sony Vegas 9.0c, the CPU is at less than 60%.

I want to know what component of my system is limiting the speed of rendering a video at the end of editing. Depending on the situation, it takes a minute to half an hour (potentially more) to render edited footage to .mp4. What upgrade would enable rendering in less than the current time?
 
What format is the video in? I just downloaded VirtualDub and it won't import .mov files, which demand the most processing power.

When I render HD footage out of Adobe Premiere all my cores are @ 100%. Is it 720 or 1080 you're using?
 
What are you using to determine your CPU usage? Chances are the program can't utilize more then 2 cores effectively, and since you have a quad core processor, only half of that can be fully utilized by that program giving you <50% usage.
 
Kornowski said:
What format is the video in? I just downloaded VirtualDub and it won't import .mov files, which demand the most processing power.

When I render HD footage out of Adobe Premiere all my cores are @ 100%. Is it 720 or 1080 you're using?
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The video format is .avi (which made the file humungous (1.2 GB for 10 seconds!) but I wanted it to be lossless for the stablisation filter which I wanted to apply in VirtualDub before importing it back into Vegas. I couldn't open the files which my camcorder produces directly (.m2ts) in VirtualDub; they had to go through Vegas first.

The resolution is 1080 lines.

[-0MEGA-];1459217 said:
What are you using to determine your CPU usage? Chances are the program can't utilize more then 2 cores effectively, and since you have a quad core processor, only half of that can be fully utilized by that program giving you <50% usage.
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I'm using Windows Task Manager which I think reports CPU usage for each core individually and shows roughly equal usage across all four cores.
 
I'd actually say that the software is not taking full advantage of the hardware. therefore, the software you are using is a bottleneck.

It is a sad fact that some software is faster than other software. Try using a different program or updating the one you have.
 
linkin said:
I'd actually say that the software is not taking full advantage of the hardware. therefore, the software you are using is a bottleneck.

It is a sad fact that some software is faster than other software. Try using a different program or updating the one you have.
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This. I've done video rendering with Nero and with DVDFlick. Nero used ±60% of my dual-core CPU capabilities, but the audio lost sync with video. DVDFlick uses only about 45-50% of my CPU's power, but the results are in sync, and the video looks better, too.
 
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