iMX6 blurred video output

Technical Support
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1

Hi,
when I play this pipeline:

gst-launch-1.0 imxv4l2videosrc device=/dev/video0 ! imxipuvideosink use-vsync=true force-aspect-ratio=true

the output video on HDMI and LVDS and filesink is blurred.
I use a standard analogue NTSC pattern generator as ADA input video source.

When I saw that the video output on screen is blurred I recorded the raw video and I play it with YUVPlayer (you download it from here) and I also could see the blurred problem on recorded file.

gst-launch-1.0 imxv4l2videosrc device=/dev/video0 ! filesink location=/media/sda1/yuv420video01.yuv

by changing the color depth the problem also changed but does not resolved.
I tested different plugins, caps but there is still the problem.

I also attach the recorded file; to play it with “yuvplayer” you should set:
Color->UYVY
Size->Custom->720*480

my vidargs is also:

setenv vidargs mxc_hdmi.only_cea=1 video=mxcfb0:dev=hdmi,bpp=32,1024x768M@60,if=RGB24 video=mxcfb1:off video=mxcfb2:off video=mxcfb3:off fbmem=32M

https://share.toradex.com/l7ua9t7ffhqymek?direct(image larger than 4 MB)

The Video Ouput
alt text

2

Hi @prog

Have you done any changes to the Software ( kernel, devicetree, …)? If yes, can you share them?

I use a standard analogue NTSC pattern generator as ADA input video source.

Could you provide some Information about this patter generator?

Thanks and best regards,
Jaski

3

Hi @jaski.tx

Have you done any changes to the
Software ( kernel, devicetree, …)?
If yes, can you share them?

No I use demo image.

Could you provide some Information
about this patter generator?

It is Leader 535B.

Have a look at this. They have the same problem and resolved it.

  1. How can I disable iMX6 input filters?

  2. How can I disable input Line Doubler?

4

Hi @prog

I don’t have experience about the iMX6 Input filter and the Line Dobler but the issue seems to be related to interlacing and cross-chrominance artifacts. The video decoder used in the Analogue camera adapter provides a multiline adaptive comb filter to reduce these effects. You should have look at the datasheet of Adv7280.

Best regards,
Jaski