a problem of CVI

Altera_Forum · ‎08-14-2011

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!

Altera_Forum · ‎08-15-2011

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.