edit video using ffmpeg

Hello,
i just downloaded the ffmpeg library. I am new to ffmpeg and what i want to do is the following:

-open a video file
-edit or replace some frames
-save it as a new video file.

The audio track should not be changed or removed.

Of course i tried to search for soltuions/tutorials myself, but i didnt find anything helpful. Can someone plz tell me how i can do that or point out functions that i want to inspect?
well that only shows how to extract the images. How can i make a Video file with the "new" images and the same audio?
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