Posted this in the IRC but I didn't get any response, so here my question in the IRC:
Tried with freeze, but I didn't get what I want...
Tried it also this way, but didn't work:
1. Cut all video-tracks (have only video) into two parts
2. Move the second parts 5 seconds to the right
3. From the left parts cutted one frame
4. Wanted to stretch that frame until the begin of the second part
-> but then it didn't stretch just the one frame! The movie just went on on the stretched part????
Please, this must be easy, but I don't get it! :-(