i.MX Processors中的主题 Re: BT.656 Video Issues

BT.656 Video Issues

nathanyoung — Tue, 10 Oct 2017 02:22:39 GMT

Hey, I'm currently having trouble viewing video from an external camera. I'm using the IPU_CSI_CLK_MODE_CCIR656_INTERLACED setting from the CSI_SENS_CONF register, v4l2 is reading that it is decoding video. (Although not at the frame rate it should be).

When the video is viewed back, however, it looks like the following. Would anyone have any insight into what I am seeing?

Re: BT.656 Video Issues

igorpadykov — Tue, 10 Oct 2017 07:43:26 GMT

Hi Nathan

pelase try with mxc_v4l2_tvin test included in unit tests package (../mxc_v4l2_test)

imx-test
www.nxp.com/lgfiles/NMG/MAD/YOCTO/imx-test-5.7.tar.gz

Best regards
igor
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Re: BT.656 Video Issues

nathanyoung — Wed, 11 Oct 2017 03:17:50 GMT

Unfortunately we are using a modified driver, which the test program does not work with. We needed to remove the necessity of individual camera drivers, so we control all of the things the sub-drivers work with custom V4L CTL commands.

However, I can tell you the BT656 is working perfectly fine with another camera we have. My current feeling is that it is due to the camera output frame size. The camera I am working with is 768x576 BT656 because it has square pixels as per https://www.intersil.com/content/dam/Intersil/documents/an97/an9728.pdf. Am I able to support this, or is it impossible?

Thanks, and sorry I couldn't be more helpful.

Re: BT.656 Video Issues

igorpadykov — Wed, 11 Oct 2017 06:28:16 GMT

Hi Nathan

one can check if camera provides correct BT656 embedded sync signals.

Best regards
igor