i.MX ProcessorsのトピックiMX6SX: VADC & CPU load

iMX6SX: VADC & CPU load

JohnDoe1z — Tue, 26 Apr 2016 09:18:17 GMT

Hello,

I'm using the VADC of the iMX6 SoloX (Sabre board) to capture and show an analog camera signal with following Gstreamer pipeline:

gst-launch-1.0 imxv4l2src device=/dev/video1 ! imxv4l2sink device=/dev/video0

The pipeline works, i.e. the picture is shown correctly, but I get a CPU load of nearly 100% while the pipeline is running, which, of course, is not acceptable. I would expect a one-digit cpu-load. What am I doing wrong?

I'm using kernel 4.1.x.

Re: iMX6SX: VADC & CPU load

joanxie — Thu, 28 Apr 2016 07:59:43 GMT

could you confim if high cpu loading is caused by only playing video?

high cpu loading depends on what usage cpu use.

Re: iMX6SX: VADC & CPU load

JohnDoe1z — Thu, 28 Apr 2016 08:06:19 GMT

Yes I can confirm that; gst-launch is eating up all the cpu-cycles. When I terminate the process, the cpu-load is close to 0%.

I'm pretty sure you can easily repdroduce this behavior.

Re: iMX6SX: VADC & CPU load

joanxie — Thu, 28 Apr 2016 08:37:06 GMT

how about add "sync=false " in the command?

Re: iMX6SX: VADC & CPU load

JohnDoe1z — Thu, 28 Apr 2016 08:47:26 GMT

I've tried with gst-launch-1.0 imxv4l2src device=/dev/video1 ! imxv4l2sink device=/dev/video0 sync=false and still the same result (output from top):

PID PPID USER STAT VSZ %VSZ %CPU COMMAND
597 568 root S 52064 5% 99% gst-launch-1.0 imxv4l2src device=/dev/video1 ! imxv4l2sink device=/dev/video0 sync=false

I've also tried to set the sync property on the imxv4l2src, but the property apparently does not exist there.