I need an Android developer experienced with ffmpeg and videos

General information for the business: Existing Android App feature Kind of development: Customization of existing program Num. of modules: 1 Description of requirements/functionality: hi there i am the owner of an android app with a nice traffic. i was planning to add a service to this app and i need a fixed quote and a time esteem for the work. it is a video editing app. i would like to add 1 basic ffmpeg feature that is to say the possibility to play with brightness, contrast and saturation of the video. in poor world the eq. function in ffmpeg i neeed to support mp4, 3gp and wmv files. the main point is the preview and the subscription integration without crashes or problems since the main feature of this app is that it is roboust and never crash. the app already have inapp purchase functionality, but in this case i am thinking to propose to my existing users a monthly subscription model Extra notes: