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Altera_Forum's avatar
Altera_Forum
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14 years ago

a problem of CVI

Hello!

I have a video system. The video stream(PAL) is decoded by ADV7403 and decoded to be BT656. Then the video stream(BT656) enters FPGA by CVI. In FPGA ,I have a simple process----CVI(YCbCr 4:2:2)->Color Plane Sequencer->Chroma Resample->Color Space Converter->Deinterlacer->Frame Buffer->CVO(720*576). At last, TFP410 encode the stream to be DVI output. But the output is lost frame, that is, the video is glitches. I have another system----Test Pattern Generator(YCbCr 4:2:2 interlace) ->Color Plane Sequencer->Chroma Resample->Color Space Converter->Deinterlacer->Frame Buffer->CVO(720*576), and encode DVI output and output is perfect. So ,I guess the problem is CVI. Maybe CVI can't recognize my CVI. I don't know what I should do. And I wish I can deal with this problem from this. Thank you!

1 Reply

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    14 years ago

    Hi,

    The problem could easily be the CVI... You need to set the parameters to match the format of the video. I suggest you check the "video lock" status, detected video size and fifo underflow bits. This will help you determine what's going wrong.