video-helper.swift

#!/usr/bin/swift

import Foundation

enum Device: String {
    case phone
    case tablet
    
    var videoSize: Int {
        switch self {
        case phone: return 440
        case tablet: return 1200
        }
    }
    
    var overlaySize: Int {
        switch self {
        case phone: return 400
        case tablet: return 600
        }
    }
}

// MARK:- Run

let env = NSProcessInfo.processInfo().environment as [String : String]
let args = Process.arguments

var devices: [Device] = []

if args.contains("phone") {
    devices.append(.phone)
}

if args.contains("tablet") {
    devices.append(.tablet)
}

guard devices.count > 0 else {
    print("Please supply at least one device - Usage: video-helper.swift [phone, tablet]")
    exit(1)
}

// setup/build
for device in devices {
    print("\n**** Outputting video for \(device.rawValue) ****\n")
    let cmd = "ffmpeg -nostdin -i in.mp4 -filter:v \"crop=\(device.videoSize):in_h:(in_w/2)-\(device.videoSize/2):0\" -c:a copy cropped.mp4 && ffmpeg -i cropped.mp4 -i diffuse.png -filter_complex \"[1:v]scale=\(device.overlaySize):\(device.overlaySize) [ovrl], [0:v][ovrl]overlay=(W-w)/2:(H-h)/4\" -codec:a copy \(device.rawValue).mp4"
    print(cmd)
    system(cmd)
    system("rm -f cropped.mp4")
    
}