topic IMX8MP gstreamer camera capture in i.MX Processors

IMX8MP gstreamer camera capture

Jayden_Soon — Thu, 18 May 2023 03:27:04 GMT

I am developing a camera with DART-MX8M-PLUS.

I want to process capture image while streaming in QT.

Now I am doing like below.

gst-launch-1.0 v4l2src device=/dev/video1 ! imxvideoconvert_g2d ! video/x-raw,width=720, height=480 ! tee name=t t. ! queue ! waylandsink t. ! queue ! jpegenc ! multifilesink location=capture.jpg max-files=1

But files are being overwritten continuously and CPU load also goes up.

Are there another ways to capture at the time I want while streaming?

Thanks.

Best regards,

Jayden

Re: IMX8MP gstreamer camera capture

Zhiming_Liu — Mon, 22 May 2023 01:11:45 GMT

Do you want to process each frame from camera? Why not use the opencv to capture at the time you want while streaming?

Re: IMX8MP gstreamer camera capture

malik_cisse — Mon, 22 May 2023 09:42:39 GMT

Using your command you need to add: num-buffers=1
gst-launch-1.0 v4l2src num-buffers=1 device=/dev/video2 ! video/x-raw,width=3840,height=2160 ! videoconvert ! jpegenc ! multifilesink location=test1.jpg

You can only do this properly programmatically.
One solution would be to Tee in an appsink and encode a jpeg on demand.
Fakesink would also work. See example attached.

Re: IMX8MP gstreamer camera capture

Jayden_Soon — Mon, 22 May 2023 23:41:10 GMT

Hi malik,

Thank you so much for the good sources.
I'll test it.

Thanks.

Best regrads,

Jayden

Re: IMX8MP gstreamer camera capture

Jayden_Soon — Mon, 22 May 2023 23:43:34 GMT

Hi Qmiller,

Then, are there examples that I can refer to using opencv?

Thanks.

Best regards,

Jayden