Linux/AM5708: OV8858 can't capture or display on am5708

Thanks to replay,  we can get video form ov8858 used v4l2capturedisplay -w 1280 -h 800 -n 0 -d /dev/video1 -s 32:1280x800,but the display is abnormal like below.why?

root@am57xx-evm:~# yavta --enum-formats /dev/video1
Device /dev/video1 opened.
Device `cal' on `platform:cal-000' is a video output (without mplanes) device.
- Available formats:
        Format 0: SBGGR10 (30314742)
        Type: Video capture (1)
        Name: 10-bit Bayer BGBG/GRGR
        Frame size: 1280x800 ()

Video format: SBGGR10 (30314742) 1280x800 (stride 2560) field none buffer size 2048000

Because ov8858 output is BG10,so i used command below ,but faild

root@am57xx-evm:~# dmabuftest -s 32:1280x800 -c 1280x800@BG10 /dev/video1
Opening Display..
using 1 connectors, 1280x800 display, multiplanar: 1
Opening V4L2..
ERROR:alloc_buffer:175: invalid format: 0x30314742
ERROR:alloc_buffers:226: allocation failed

root@am57xx-evm:~# yavta -c60 -fBG10v8858.raw -s1280x800
Unsupported video format 'BG10'

Hello,

From what I see yavta does not recognize the format.

Please in the guide above there is an example how to use yavta:

yavta -c60 -fYUYV -Fvout_1280x800_yuyv.yuv -s1280x800 /dev/video1

In the yavta source code there is     { "SBGGR10", V4L2_PIX_FMT_SBGGR10, 1 }, not BG10.

I would recommend you to check "Supported Features" in the guide. 

Hope this helps.

BR

Margarita

Margarita:

   You are right .I can used yavta -c60 -fSBGGR10 -F8858.raw -s1280x800 /dev/video1 capture file. How can i display this 8858.raw file on lcd?

This command "v4l2capturedisplay -w 1280 -h 800 -n 0 -d /dev/video1 -s 32:1280x800" can not point the format like SBGGR10.What i want is lookback ,capture and display normal but not like the picture.

THX

Hello,

penny deng said:

This command "v4l2capturedisplay -w 1280 -h 800 -n 0 -d /dev/video1 -s 32:1280x800"

This demo supports V4L2_PIX_FMT_YUYV format. That is why is not working for SBGGR10.

BR
Margarita

Margarita:

  Thanks to reply .What i want is loopback ,capture and display normally.

how can i to achieve that,or what demo should i used?

THX

Margarita:

   Form the link say "AM5728 doesn't have any hardware accelerator like ISP to do the RAW Bayer to YUV conversion. This will need to be done in software." What's your suggest ? OPENCV? I think the performance will be bad.

Hello,

I am not the right person for OpenCV.

I would recommend you to open a new thread about OpenCV.

But just in case here is the openCV guide

http://software-dl.ti.com/processor-sdk-linux/esd/docs/latest/linux/Foundational_Components_OpenCV.html

BR
Margarita