Thank you for your answer.
I tried to package my project by using ue4 ( I used command, buildUAT.bat). After I packaged my project, i have a exe file. The exe file is run ok but I cannot see the video feed(which set in aja port1). It like the second image above.
My problem that: When I have exe file (or Lauch game in UE4 Editor, not Play), i cannot see the video feed on its. I sure that I can see the video feed in Editor mode.
Do you ever meet it before? What next can I do to fix that?
Thank you so much.