GPUImage3 Unable to export video to Document Directory - ios

Question

I am using following source code to export filtered video to document directory but the exported file is corrupted/wrong.
Would you please go through following source and let me know where I am making mistake?
class ViewController: UIViewController {
#IBOutlet weak var renderView: RenderView!
var movie:MovieInput!
var writer:MovieOutput!
var filter:LookupFilter!
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
let bundleURL = Bundle.main.resourceURL!
let movieURL = URL(string:"sample_iPod.m4v", relativeTo:bundleURL)!
do {
let documentDirectory = try FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor:nil, create:true)
let fileURL = documentDirectory.appendingPathComponent("TestVideo.mov")
movie = try MovieInput(url:movieURL, playAtActualSpeed:true)
writer = try MovieOutput(URL: fileURL, size: Size(width: 100.0, height: 100.0))
filter = LookupFilter()
filter.lookupImage = PictureInput(image: UIImage(named: "Image")!)
movie --> filter --> renderView
movie.runBenchmark = true
movie.addTarget(writer)
movie.start()
writer.startRecording()
self.writer.finishRecording {
print("Written")
}
} catch {
print("Couldn't process movie with error: \(error)")
}
}
}

Answer 1

Simple answer: now you have 5 seconds .
self.movie.addTarget(writer)
self.movie.start()
self.filter --> self.writer
self.writer.startRecording()
let interval = 5 // now you have 5 seconds .
DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + interval) {
self.writer.finishRecording {
print("Written")
}
}
To solve your problem forward,
You should extract out the record logic. put that in a filter button action.
like the following demo code .
#IBAction func capture(_ sender: AnyObject) {
if (!isRecording) {
do {
self.isRecording = true
let documentsDir = try FileManager.default.url(for:.documentDirectory, in:.userDomainMask, appropriateFor:nil, create:true)
let fileURL = URL(string:"test.mp4", relativeTo:documentsDir)!
do {
try FileManager.default.removeItem(at:fileURL)
} catch {
}
movieOutput = try MovieOutput(URL:fileURL, size:Size(width:480, height:640), liveVideo:true)
filter --> movieOutput!
movieOutput!.startRecording()
DispatchQueue.main.async {
// Label not updating on the main thread, for some reason, so dispatching slightly after this
(sender as! UIButton).titleLabel!.text = "Stop"
}
} catch {
fatalError("Couldn't initialize movie, error: \(error)")
}
} else {
movieOutput?.finishRecording{
self.isRecording = false
DispatchQueue.main.async {
(sender as! UIButton).titleLabel!.text = "Record"
}
self.movieOutput = nil
}
}
}
You miss one line code filter --> writer
movie.addTarget(writer)
movie.start()
filter --> writer
writer.startRecording()
self.writer.finishRecording {
print("Written")
}