JSON animation converted to mp4 server-side

I have a JSON file that has an animation. I need to be able to upload this file (with the relevant sound files) and it convert it to an mp4 file on the fly. The JSON will have certain variables editing and changed via POST request (I will handle this), uploaded and the video saved. The JSON file has been generated from Adobe After Effects. All you need to do it make the JSON be converted to mp4 format.

Will share the JSON file once started project, however, you can use your own JSON animation from Adobe After Effects in order to test.

Please only apply for this project if you fully understand and are able to get this completed.