Two FFMPEG functions into an Android project

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Project Description:
I need a relatively simple job done in android using ffmpeg (version 2.1.4 I think).

What I need is a java code (probably with ndk, jni and so on) that have 2 functions:
1. Put a video on top of another video (overlay) in the specified place and time.
2. Join two videos one after another (when first ends, second starts).

It's two functions. I already have an android java project, I just need you to provide me the needed code and libraries to integrate this ffmpeg functions into my project.


Additional Project Description:
03/21/2014 at 16:58 ART
I will provide the FFMPEG command line commands to do those 2 actions (I have them).
You need to convert them to a working code of course.

Skills required:
Android, Java, Mobile Phone
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