V4L2 Interlaced field support in iMX8QM Linux Kernel 4.19.35

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V4L2 Interlaced field support in iMX8QM Linux Kernel 4.19.35

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Contributor I

I'm programming V4L2  using Linux 4.19.35, on an evaluation board MCIMX8QM-CPU.

Analog Video Decoder board is connected to MIPI-CSI.

I want to input NTSC interlaced data to MIPI-CSI and perform de-interlace conversion by ISI.

Is it supported in Linux Kernel 4.19.35 drivers?

The V4L2 API seems to support Interlaced, so I want to retrieve images that have been de-interllaced with that function.

Thanks.

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NXP TechSupport
NXP TechSupport

Hello aso,

Yes it works, ISL79987 is the 4 virtual channel TVin chip which can input 2 CVBS cameras to iMX8QM with MIPI CSI2 inteface

To test the capture to file:

$ /unit_tests/V4L2/mx8_v4l2_cap_drm.out -cam 1 -num 300 -fmt YUYV -of

or /unit_tests/V4L2/mx8_v4l2_cap_drm.out -cam 1 -fmt RGBP -num 30000

Note:

1. For weaving mode de-interlace, when the ISI is doing de-interlace, it can't do CSC at the same time, so preview will get color issue, because the real output video is always YUYV format

 

Regards

 

 

 

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NXP TechSupport
NXP TechSupport

Hello aso,

Yes it works, ISL79987 is the 4 virtual channel TVin chip which can input 2 CVBS cameras to iMX8QM with MIPI CSI2 inteface

To test the capture to file:

$ /unit_tests/V4L2/mx8_v4l2_cap_drm.out -cam 1 -num 300 -fmt YUYV -of

or /unit_tests/V4L2/mx8_v4l2_cap_drm.out -cam 1 -fmt RGBP -num 30000

Note:

1. For weaving mode de-interlace, when the ISI is doing de-interlace, it can't do CSC at the same time, so preview will get color issue, because the real output video is always YUYV format

 

Regards

 

 

 

View solution in original post

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