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how can i capture 960H signal in dm8168?

Tae-Un Kwon
Prodigy 140 points
Other Parts Discussed in Thread: TVP5158

hi exports.

how to change at dm8168 capture 960H signal??

i searched E2E site at this issue. and find command is channge pixel clock.

but i dno't know change point.

hdvpss capture driver? or hdvpss *.gel file?

i wish i know point 960H signal capture start...

Thanks regard.

  • 0
    TI__Expert 7765 points

    Hi,

    first of all you need to have hardware support to capture 960 H. DM8168 on most of the platforms have tvp5158 as a video decoder which does not support 960 H capture. It only gives four-channel D1 multiplexed 8-bit output.

    For software modifcation, you can specify capture buffer width height as 960 x 480 and then submit this buffer to next processing block. Which framework you are using on DM8168?

    While you arrange for hardware support you can test your software data flow by changing buffer sizes to 960 H resolution but still capture D1 at the input and then revalidate the data flow once evrything is in place. 

  • 0 in reply to Yogesh Marathe
    Prodigy 140 points

    Thanks your answer.

    i don't use tvp5158 video decoder. i use another video decoder. my video decoder is  960h supports decoder and  i know dm8168 capture port supports bd656 8bit.

    i want use 960H input signal. 960H support decoder is BT 1302 output. so i changed input frame widths and height at RDK_3.0.0.0

    but i don't watch images.

    i think modifyed capture port sampling Hz. i don't know this point is where.

  • 0 in reply to Tae-Un Kwon
    TI__Expert 7765 points

    Hi,

    As I discussed with experts, it appears that VIP has been validated upto 1080p capture with 168 MHz clk approximately. You need not modify the clock if you are capturing 960h. You must ensure pVipCreateArgs is populated correctly for this usecase in captureLink in CaptureLink_drvCreateInst() especially videoCaptureMode, videoIfMode and width height. Please note RDK 03.00.00.00 does not have support for 960H usecase. Implementation of this usecase will need modifications in Links and overall data flow considering all IP limitaions. The support for this usecase may be planned for future releases.