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How to capture two video signals and one audio signal simultaneouly and open two windos on one LCD screen

Hi all,

I am working on DM816x/389x EVM vs EX board.

First, I need to capture two video signals ( using two RGB ports on EX board), and one audio signal (using MIC port on dM8168 board)
 simultaneously and put the three streams in one MP4 file.
Then, display the two video on one LCD screen simultaneously using HDMI out on DM8168 board, opening two windos on one LCD screen.

can someone give me some advice how to realize the functions ?
  *capture two video signals and one audio signal simultaneouly.
  *open two windos on one LCD screen.

Regards,

Peter