i.MX ProcessorsのトピックRe: 13M Camera MJPEG Preview

13M Camera MJPEG Preview

brian_kim — Thu, 24 Dec 2015 06:31:35 GMT

Dear community,

Now, I am working camera preview by MJPEG with AP1302(13M Camera) and sabre lite board.

As you know, iMX6q support 4096*4096 input image from camera.

(IMX6DQRM : The frame resolution supported is up to 4096x4096 for input )

So, I changed frame format from UVUY to MJPG in camera.

Now, Camera is sending the MJPG frame.

but,mxc_v4l2_capture is not support MJPG format. Is right ??

And when I use guvcview (guvcview -d /dev/video0), I got a fail result by VIDIOC_QUERYCTRL.

VIDIOC_QUERYCTRL is not support by IMX6Q.

How to working camera preview with MJPG format from sensor ?

Please recommend to me.

Thank you !!

Re: 13M Camera MJPEG Preview

Yuri — Thu, 24 Dec 2015 07:35:04 GMT

Hello,

Please check if Gstreamer elements can support MJPEG, using "gst-inspect" command.

Have a great day,
Yuri

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Re: 13M Camera MJPEG Preview

brian_kim — Thu, 24 Dec 2015 08:30:53 GMT

Dear Yuri,

Thank you for your reply.

As I check with gst-inspect.

$ gst-inspect-1.0 imxv4l2src > imxv4l2src.txt

not support MJPG

$ gst-inspect-1.0 v4l2src > v4l2src.txt

support MJPG

$ gst-inspect-1.0 imxv4l2sink > imxv4l2sink.txt

not support MJPG

$ gst-inspect-1.0 v4l2sink > v4l2sink.txt

not support MJPG

$ gst-launch-1.0 --gst-debug-level=4 v4l2src device=/dev/video0 ! 'video/x-raw.formatMJPG' ! v4l2sink

could not link v4l2src0 to v4l2sink0

gst-launch_01.txt

$ gst-launch-1.0 --gst-debug-level=4 v4l2src device=/dev/video0 ! 'video/x-raw.formatMJPG' ! imxv4l2sink

could not link v4l2src0 to imxv4l2sink0

gst-launch_02.txt

I will attach files about result.

What is your recommend about it ?

Thank you !!

Re: 13M Camera MJPEG Preview

brian_kim — Thu, 24 Dec 2015 09:08:55 GMT

Dear Yuri,

I can't upload txt file. so I uploaded capture files.

gst-inspect-1.0 imxv4l2src

gst-inspect-1.0 imxv4l2sink

gst-inspect-1.0 v4l2src

gst-inspect-1.0 v4l2sink

gst-launch-1.0 --gst-debug-level=4 v4l2src device=/dev/video0 ! 'video/x-raw.formatMJPG' ! v4l2sink

gst-launch-1.0 --gst-debug-level=4 v4l2src device=/dev/video0 ! 'video/x-raw.formatMJPG' ! imxv4l2sink

Re: 13M Camera MJPEG Preview

Yuri — Wed, 20 Jan 2016 09:23:26 GMT

Hello,

You may use just " v4l2src" (say, USB cam) as camera source for the MJPG.

Regards,

Yuri.