imx8mp can't convert RGB to YUV properly

[jemish_1990]

Hi All,

We are making imx8mp based product. In this product we have usecase capture and preview video on LCD.

For imx8mp, If I run this command I am getting output as attached video (video_with_wrong_colors.mp4). I am also attaching image which format gstreamer take as input and what it displays.

gst-launch-1.0 -v v4l2src device=/dev/video3 ! glimagesink

Please note if I select BGR format I am able to capture video correctly with correct format. Attached video (captured_dump_file.mp4). I use the following command to capture and dump correct data.

v4l2-ctl --verbose --device /dev/video3 --stream-mmap --stream-to=frame.yuv --stream-count=60 --set-fmt-video=width=1280,height=720,pixelformat=BGR3 --stream-to=./frame.yuv

We are facing issue in displaying same data on LCD. Please provide if you have any suggestion regarding that.

If I try to display same BGR data on LCD using following command I am getting flashy video (flashy.mp4). Which doesn't looks good

gst-launch-1.0 -v v4l2src device=/dev/video3 ! video/x-raw, format=BGR ! videoconvert ! queue ! video/x-raw, format=BGR ! glimagesink

In addition to that I have tried many other commands but none of them help to preview it correctly. Please suggest if you have any suggestion regarding it. 

Thanks,

Jemish

[Manuel_Salas]

Hello @jemish_1990 

I hope you are doing very well.

Could you please try to convert to RGB?

$ gst-launch-1.0 -v v4l2src device=/dev/video3 ! video/x-raw, format=BGR ! videoconvert ! video/x-raw, format=RGB ! glimagesink

Or if it does not work, wit RGBA:

$ gst-launch-1.0 -v v4l2src device=/dev/video3 ! video/x-raw, format=BGR ! videoconvert ! video/x-raw, format=RGBA ! glimagesink

Best regards,

Salas.

[jemish_1990]

Hi Salas,

Thanks for your answer. We tried these gstreamer commands but neither of them helped. Finally we had to modify ISP register configuration at kernel level. That swap the order of 'R' and 'B' bytes. Using that we are able to fix it.

We can close this thread. Thanks for your support.

Thanks,

Jemish

[jemish_1990]

Hi All,

Just want to mentioned that we are using 6.6.36 kernel for our development.

Thanks,

Jemish