I'm using PryntTrimmerView for trimming video file. there is my code for exportation trimming video file, and generating video thumbnail:
func prepareAssetComposition() throws {
guard let asset = trimmerView.asset, let videoTrack = asset.tracks(withMediaType: AVMediaTypeVideo).last else {
return
}
let size = videoTrack.naturalSize.applying(videoTrack.preferredTransform)
print(CGSize(width: fabs(size.width), height: fabs(size.height)))
let assetComposition = AVMutableComposition()
let start = trimmerView.startTime?.seconds
let end = trimmerView.endTime?.seconds
let startTime = CMTime(seconds: Double(start ?? 0), preferredTimescale: 1000)
let endTime = CMTime(seconds: Double(end ?? 0), preferredTimescale: 1000)
let trackTimeRange = CMTimeRange(start: startTime, end: endTime)
let compositionTrack = assetComposition.addMutableTrack(withMediaType: AVMediaTypeVideo, preferredTrackID: kCMPersistentTrackID_Invalid)
try compositionTrack.insertTimeRange(trackTimeRange, of: videoTrack, at: kCMTimeZero)
var url: URL!
if self.state == .Left {
url = URL(fileURLWithPath: "\(NSTemporaryDirectory())TrimmedMovie1.mp4")
}else if state == .Right {
url = URL(fileURLWithPath: "\(NSTemporaryDirectory())TrimmedMovie3.mp4")
}else if state == .Center {
url = URL(fileURLWithPath: "\(NSTemporaryDirectory())TrimmedMovie2.mp4")
}
try? FileManager.default.removeItem(at: url)
let exportSession = AVAssetExportSession(asset: assetComposition, presetName: AVAssetExportPresetHighestQuality)
if UIDevice.current.userInterfaceIdiom == .phone {
exportSession?.outputFileType = AVFileTypeQuickTimeMovie
}else {
exportSession?.outputFileType = AVFileTypeQuickTimeMovie
}
exportSession?.shouldOptimizeForNetworkUse = true
exportSession?.outputURL = url
exportSession?.exportAsynchronously(completionHandler: {
DispatchQueue.main.async {
if let url = exportSession?.outputURL, exportSession?.status == .completed {
var thump: UIImage?
var vData: Data?
if let asset = self.trimmerView.asset {
if let img = asset.videoThumbnail {
thump = img
}
}
if let videoData = NSData(contentsOf: url) {
vData = videoData as Data
}
if let delegate = self.delegate {
delegate.setVideoFromPath(path: url.path, thump: thump, videoData: vData)
self.dismiss(animated: true, completion: nil)
}
} else {
let error = exportSession?.error
print("error exporting video \(String(describing: error))")
}
}
})
}
extension AVAsset{
var videoThumbnail:UIImage?{
let assetImageGenerator = AVAssetImageGenerator(asset: self)
var time = self.duration
time.value = min(time.value, 2)
do {
let imageRef = try assetImageGenerator.copyCGImage(at: time, actualTime: nil)
let thumbNail = UIImage.init(cgImage: imageRef)
print("Video Thumbnail genertated successfuly")
return thumbNail
} catch {
print("error getting thumbnail video")
return nil
}
}
}
sometimes video and thumbnail that export rotate to landscape rotation, This is most likely to happen when the video is recorded on a mobile camera. How can solve this issue. and force asset Orientation to portrait? thanks for all reply.
