Need some help here with freeze scene
First of all, sry for my english.
Now, here its my problem: I want to freeze a frame for a certain time (3 seconds) and insert a picture frame while it is frozen. However, when I create a composite shot of this frame, it is black. Follow the exemplifying images:
Without composite shot: https://s14.postimg.io/ko47d8olt/sem_composite.png
With composite shot:https://s10.postimg.io/yah9v4c21/com_composite.png
What can i do to solve this problem?