This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Composite output clarity degrades on output

Hi ,


   I am working on DM8168 EZSDK (dm816x-evm_5_05_02_00) . when i was taking video out from composite out ,it seems the output video clarity is degrading with more brightness and less sharpness . And it seems at video out only it's more observable, So can anyone tell whether there is  any control for brightness and contrast in VPSS display out . I didn't find any controls to this parameters mentioned in VPSS driver help guide or any other docs . attaching captured video screen shots at various points and pipeline for taking capture to display out.

Please keep following points in mind .

   Top Left         >>>>>  Direct video 

   Top Right       >>>>>  Before scalar (720X288) .

   Bottom left     >>>>>  After Scalar  (720x288 ) .

             Bottom Right  >>>>>  After Display (720X288) .

gstreamer pipeline for getting input to display .

gst-launch omx_camera input-mode=8_BIT input-interface=VIP1_PORTB skip-frames=1 ! "video/x-raw-yuv, format=(fourcc)NV12, width=720, height=288, framerate=60/1, buffer-count-requested=10" ! omx_hdeiscaler name=d d.src_00 ! "video/x-raw-yuv, format=(fourcc)YUY2, width=720, height=576" !   gstperf  ! v4l2sink sync=false device=/dev/video3

Issue can cleanly observe if we compare top left ( direct video ) with bottom right (processed composite out ) screen shots and video getting worst after display only so any one can help me finding the control over brightness and contrast on VPSS display module . is there any register or through some v4l2 macros can we do that ? I have seen in standard linux v4l2 driver docs some macros are mentioned  for controlling brightness and sharpness , so can any body tells which register address i can check in VPSS for the above purpose ?