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AVAssetWriter error code on finishWriting
This error is mostly because you are trying to export an AVAsset. Solve this using AVMutableComposition for export.
sample code for trimming a video file
let manager = FileManager.default
guard let documentDirectory = try? manager.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: true) else { print("TRIM Failed to access directory")
return}
let mediaType = "mp4"
if mediaType == kUTTypeMovie as String || mediaType == "mp4" as String {
let asset = AVAsset(url:videoURL!)
let length = Float(asset.duration.value) / Float(asset.duration.timescale)
print("TRIM video length: \(length) seconds")
let composition = AVMutableComposition()
let audioTrack: AVMutableCompositionTrack = composition.addMutableTrack(withMediaType: AVMediaType.audio, preferredTrackID: kCMPersistentTrackID_Invalid)!
let videoTrack: AVMutableCompositionTrack = composition.addMutableTrack(withMediaType: AVMediaType.video, preferredTrackID: kCMPersistentTrackID_Invalid)!
var outURL_speed=documentDirectory.appendingPathComponent("output")
var outputURL = documentDirectory.appendingPathComponent("output")
do {
try audioTrack.insertTimeRange(CMTimeRangeFromTimeToTime(start: self.startTime, end: self.endTime), of: asset.tracks(withMediaType: AVMediaType.audio)[0], at: CMTime.zero)
try videoTrack.insertTimeRange(CMTimeRangeFromTimeToTime(start: self.startTime, end: self.endTime), of: asset.tracks(withMediaType: AVMediaType.video)[0], at: CMTime.zero)
try manager.createDirectory(at: outputURL, withIntermediateDirectories: true, attributes: nil)
outputURL = outputURL.appendingPathComponent("preVideo-\(self.postID).\(mediaType)")
outURL_speed = outURL_speed.appendingPathComponent("Video-\(self.postID).\(mediaType)")
print("TRIM output dir: \(outputURL)")
}catch let error {
print(error)
}
_ = try? manager.removeItem(at: outputURL)
guard let exportSession = AVAssetExportSession(asset: composition, presetName: AVAssetExportPresetHighestQuality) else {return}
exportSession.outputURL = outputURL
exportSession.shouldOptimizeForNetworkUse = true
exportSession.outputFileType = .mp4
let timeRange = CMTimeRange(start: self.startTime, end: self.endTime)
exportSession.timeRange = timeRange
exportSession.exportAsynchronously{
switch exportSession.status {
case .completed:
print("TRIM exported at \(outputURL)")
self.changeSpeed(url: outputURL,outUrl:outURL_speed)
case .failed:
print("TRIM failed \(exportSession.error)")
case .cancelled:
print("TRIM cancelled \(exportSession.error)")
default: break
}
}