You are using temporal effects (noise reduction, stabilizer) which require linear progression. Nothing else needs to be said. AE is behaving normally.
Can you please elaborate? Are you saying this is a filter natural scheduling issue?
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There are two things going on here. Some filters take better advantage of your system's power than others. Some are not MP friendly, some are. Until the developers have the time (and it takes a bunch of time) and the resources (it costs a bunch of money) to make every program call completely aware of an unlimited variety of plug-ins, system configurations, and background processes so each read/calculate/write process uses 100% of every possible data path, you'll never get an app as complex as AE 100% efficient.
The second thing going on here is that the system can process data faster than the data can be move on and off a drive. Grab frame info, process it, be done with it, then write it and grab it again before you can grab another frame. When the process requires this kind of analysis the bottle neck is the data transfer rate on and off a drive or in and out of memory. That's the linear progression that Mylenium is talking about. Temporal effects do this kind of processing. Things have to wait for read, calculate, write cycles. We'll just have to wait until developers have the resources to change that. AE gets better at doing most things with each new build. Sometimes bugs pop up, sometimes things that shouldn't slip past QA/QC do, but I clearly remember when just rendering a simple key took 20 or 30 seconds a frame.
BTW, Virtual dub can run your CPU's to 100% easily because it's just doing a single set of calculations.
I have to same problem. But I only use CS6 Warpstabilizer. I understand that's one of the new key features and I guess it supports multiprocessing. I have a HP Z820 with 24 halfcores and only one is active.
I have set up the system the same way as in duartix' official adobe setup link. All SSDs. Still CPU usage is only 4%. Is that supposed to be like that?
Yes, the analysis only uses 1 process.