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scalar and video quality problem

Mingqian
Intellectual 635 points

Hi all,

         I build a DM816x link chain like:

         Capture -> DEI HQ -> ( transfer frames between A8 and m3_vpss for overlay )

         -> DEI -----------H264 Enc

                         |____MJPEG Enc

          The first DEI HQ will do the de-interlacing job, and the second DEI link will do scaling job by setting enableDeiForceBypass to TRUE, but I find the video quality after DEI is bad compared to that if I bypass the scalar by setting bypass to TRUE in Vps_ScConfig structure of Vps_M2mDeiChParams structure. Please see the following snap for quality difference, and this problem happens even the output resolution of scalar is same as the input resolution.

      

                                                      Bypass

    

                                 Not bypass

        

        So I want to bypass scalar if I find the input and output resolution are same. Can anyone help me with how to bypass it at runtime? I try to set deiScRtCfg->scBypass to TRUE in DeiLink_drvSetChDynamicOutputRes, but it does not work.

        Any advice is welcome too.

        Thanks !

Rafael