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ipnc rdk3.8 video flick issue

Hi,

I encounter an video flick issue, this issue happen at both hdmi display and encode bitstream, please check following video link, my usecase like this:

                  |---------swms---nsf--enc
cam--dup--|
                  |----------------hdmi

camera: 1080p@60fps,

swms: 60fps output

encode: 60fps

display: 60fps

If I reduce swms output fps to 30, the flick issue is gone. I am using ipnc rdk3.8 run at dm385 platform. Any suggestion will appreciate.

I test below case that is work fine:
    case 1: change encode format from h264 to mjpeg.
    case 2: encode h264 format, change usecase like this

                  |--------- enc
cam--dup--|
                  |----------------hdmi


Following usecase still see flick(video sequence not right) issue:
    capture->swms->nsf->enc

                   |---------swms---nsf--enc (disable encode)

 cam--dup--|

                  |----------------hdmi 

Thank you very much,

david
 

video link:

https://drive.google.com/file/d/0B-paQ7KRgGzvLXVpOVRUX29IUFk/view?usp=sharing