topic Re: CPU load is getting upto 50% when USB Camera is used in i.MX Processors

CPU load is getting upto 50% when USB Camera is used

mghasan — Tue, 27 May 2014 09:33:37 GMT

When external USB camera is used for preview or recording (VGA resolution) CPU load is shooting up to 50% where as with internal camera it is only using 5%.

Is it possible to reduce CPU load for USB camera?

In our use case, CPU load is going up to 97% when we use USB camera during VOIP video call, which involves

Displaying own preview from USB camera
Displaying remote party video
VPU H264 encoding (from USB camera)
VPU H264 Decoding (remote party video).

Where as for internal camera cpu usage is up to 75%.

In practical, USB camera is not usable along with above operations for long duration calls due to high CPU usage.

Please let us know if there is any optimization possible to reduce CPU load.

Board: IMX6 SabreSD quad core

Android: 4.2.2.1

Re: CPU load is getting upto 50% when USB Camera is used

saurabh206 — Tue, 27 May 2014 09:39:45 GMT

Hi,

USB camera interface is not optimized , it is doing software color conversion for preview frame and frames to be encoded. Because of these two CSC load on CPU is too high.

Thanks

Saurabh

Re: CPU load is getting upto 50% when USB Camera is used

mghasan — Tue, 27 May 2014 10:58:27 GMT

Thanks Saurabh.

Could you please suggest on how to use HW CSC?

Re: CPU load is getting upto 50% when USB Camera is used

saurabh206 — Fri, 30 May 2014 03:42:12 GMT

Hasan

You need to use IPU task to do the HW CSC.

Please check IPU example which will help you to implement it.

Thanks

Saurabh