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TDA4VMXEVM: Question about visionapps/apps/basic_demos/app_multi_cam sample - preview latency issue

Part Number: TDA4VMXEVM

 Hello, guys. 

I'm working in   electronic mirror system. 

I already checked the   below sample codes.  

  - visionapps/apps/basic_demos/app_multi_cam  

  - visionapps/apps/basic_demos/app_single_cam 

After then, I think ... above sample code is not useful reference code for  developing   the  electronic  mirror  application. 

It has  big  latency  during the camera preview time.  (At least  more then 300 ms  delay)

Nomally, those  electronic mirror system  require   less then 80 ms. 

* Question 

  -  Is there a way to reduce the   preview  latency ?

    And, could you share the  reference  code  for above sample code? 

    example. 

    - In linux application, I usually use the DMA ...  then I can  matched the   less then 70 ms  latency.