How to run a terminal program like FFMPEG from Xcode coco app using swift? - swift

Question

I am working on making a Xcode app using swift. I am trying to run FFMPEG when someone clicks on a button. In terminal it would look like
ffmpeg -i input.mp4 output.mp4
But after searching everywhere, I can't seem to find how to run a command as if you were typing it into Terminal.
So my question is, how do you run a command (probably from a textfield) just as if you typed it into Terminal?
Here is my code so far:
import Foundation
import Cocoa
class ViewController: NSViewController {
#IBOutlet weak var inURL: NSTextField!
#IBOutlet weak var inText: NSTextField!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override var representedObject: Any? {
didSet {
// Update the view, if already loaded.
}
}
#IBAction func clickURL(_ sender: Any) {
var musicURL = inURL.stringValue
if musicURL.isEmpty {
musicURL = "No URL entered!"
}
let textReplace = "Downloading music from: \(musicURL)..."
inText.stringValue = textReplace
Process.launchedProcess(launchPath: "/usr/local/Cellar/ffmpeg/4.0.2/bin/ffmpeg", arguments: ["-i","input.mp4","output.mp4"])
}
}
I will also be using youtube-dl from GitHub, if I can get FFMPEG working.

Answer 1

var p = Process.launchedProcess(launchPath: "/a/path/to/ffmpeg", arguments: ["-i", "input.mp4", "output.mp4"])

Answer 2

I am also trying to do this at the moment and it seems to be a permission issue, has nothing to do with swift. I recently read it here. The idea is that sandboxed apps cannot read files from just anywhere. For some standard paths, you can enable access (see here), but for others you cannot. Also, seems like it is possible to launch executables from /usr/bin by default, but not for /usr/local/bin, at least not without specifically enabling it. I'll be looking into this some more and come back if I find a proper solution.
Edit:
An option that I just tested an works for me, is to bundle ffmpeg in my app sandbox and use it from there. I downloaded ffmpeg from here and added it to Xcode in the target Build Phases > Copy Bundle Resources, then accessed it programmatically from this path
let ffmpegPath = Bundle.main.bundlePath + "/Contents/Resources/ffmpeg"