Image processing

The code must be writed in C/UNIX!
The application will be client-server(UNIX) type. The client establishes a connection with the server. After the connection has been established, the client can send the image to the server, type of transition (like fade-in or fade-out or both) and its position (in front of the image or after the image or in both sides). The server will handle the image processing and transforming it into a short video with the extension .mp4 which is sent as response back to the client.
The application will support :
-execution thread for the administration client interface (UNIX socket)
-execution thread for simple client interface, users(INET socket)
-execution thread for WS simple client interface(WS, REST example)
-main thread of execution, coordinating secondary threads


The final result must be like this (is a short mp4 video at the bottom) https://www.bogotobogo.com/FFMpeg/ffmpeg_fade_in_fade_out_transitions_effects_filters.php

I need the code to be commented and I need your support to run it.