FFMPEG Batch Processing on Mac

I use ffmpeg to transcode videos on the Mac and am looking for a Droplet or other little app that can automate this process. I'd like to drag a single video file, or multiple video files onto the icon and have it batch process them. It could be a simple app with no UI and output an h.264 at an 18 setting in MP4 format; or it could give me a window with a few options (sometimes I want an uncompressed output, for instance). Retaining every frame and not duplication any frames is key in my work. For instance if the original is 15 FPS, I need the output to be 15 FPS. If the original had 3,000 frames, the output needs to have 3,000 frames. I can do this pretty easily in Windows by creating a .bat file, but it seems to elude me on the Mac.