我正在处理一项任务，我必须将录制的视频从特定的起始点修剪为用户输入或选择的特定终点。我该怎么做呢因为我之前使用过UIVideoEditorController，但我不想使用默认视图，我想直接修剪视频。
let FinalUrlTosave = NSURL(string: "\(newURL)")
exportSession!.outputURL=FinalUrlTosave
exportSession!.shouldOptimizeForNetworkUse = true
// exportSession.outputFileType = AVFileTypeQuickTimeMovie
exportSession!.outputFileType = AVFileTypeQuickTimeMovie;
let start:CMTime
let duration:CMTime
var st = starttime.doubleValue
var ed = endTime.doubleValue
start = CMTimeMakeWithSeconds(st, 600)
duration = CMTimeMakeWithSeconds(ed, 600)
// let timeRangeForCurrentSlice = CMTimeRangeMake(start, duration)
let range = CMTimeRangeMake(start, duration);
exportSession!.timeRange = range
exportSession!.exportAsynchronouslyWithCompletionHandler({
switch exportSession!.status{
case AVAssetExportSessionStatus.Failed:
print("failed \(exportSession!.error)")
case AVAssetExportSessionStatus.Cancelled:
print("cancelled \(exportSession!.error)")
default:
print("complete....complete")
// self.SaveVideoToPhotoLibrary(destinationURL1!)
}
})
我试图用这个来实现我的目标，但没有成功。
错误信息：
failed可选（错误域= NSURLErrorDomain代码= -1100“在此服务器上找不到请求的URL。”UserInfo = {NSErrorFailingURLStringKey = file：/// var / mobile / Containers / Data / Application / E68D3BFD-6923-4EA6-9FB3 -C020CE4AA9D4 / Documents / moment / jGq_9AUFa47s2ZiiPP4x.mp4，NSErrorFailingURLKey = file：///var/mobile/Containers/Data/Application/E68D3BFD-6923-4EA6-9FB3-C020CE4AA9D4/Documents/moment/jGq_9AUFa47s2ZiiPP4x.mp4,NSLocalizedDescription =要求在此服务器上找不到URL。，NSUnderlyingError = 0x1553c220 {错误域= N.
第二次出错：
failed可选（错误域= NSURLErrorDomain代码= -3000“无法创建文件”UserInfo = {NSUnderlyingError = 0x14e00000 {Error Domain = NSOSStatusErrorDomain Code = -12124“（null）”}，NSLocalizedDescription =无法创建文件}）
我找到了使用这种方法的解决方案，它就像一个魅力....
func cropVideo(sourceURL1: NSURL, statTime:Float, endTime:Float)
{
let manager = NSFileManager.defaultManager()
guard let documentDirectory = try? manager.URLForDirectory(.DocumentDirectory, inDomain: .UserDomainMask, appropriateForURL: nil, create: true) else {return}
guard let mediaType = "mp4" as? String else {return}
guard let url = sourceURL1 as? NSURL else {return}
if mediaType == kUTTypeMovie as String || mediaType == "mp4" as String {
let asset = AVAsset(URL: url)
let length = Float(asset.duration.value) / Float(asset.duration.timescale)
print("video length: \(length) seconds")
let start = statTime
let end = endTime
var outputURL = documentDirectory.URLByAppendingPathComponent("output")
do {
try manager.createDirectoryAtURL(outputURL, withIntermediateDirectories: true, attributes: nil)
let name = Moment.newName()
outputURL = outputURL.URLByAppendingPathComponent("\(name).mp4")
}catch let error {
print(error)
}
//Remove existing file
_ = try? manager.removeItemAtURL(outputURL)
guard let exportSession = AVAssetExportSession(asset: asset, presetName: AVAssetExportPresetHighestQuality) else {return}
exportSession.outputURL = outputURL
exportSession.outputFileType = AVFileTypeMPEG4
let startTime = CMTime(seconds: Double(start ?? 0), preferredTimescale: 1000)
let endTime = CMTime(seconds: Double(end ?? length), preferredTimescale: 1000)
let timeRange = CMTimeRange(start: startTime, end: endTime)
exportSession.timeRange = timeRange
exportSession.exportAsynchronouslyWithCompletionHandler{
switch exportSession.status {
case .Completed:
print("exported at \(outputURL)")
self.saveVideoTimeline(outputURL)
case .Failed:
print("failed \(exportSession.error)")
case .Cancelled:
print("cancelled \(exportSession.error)")
default: break
}
}
}
}
一个swift4版本。
static func cropVideo(sourceURL: URL, startTime: Double, endTime: Double, completion: ((_ outputUrl: URL) -> Void)? = nil)
{
let fileManager = FileManager.default
let documentDirectory = fileManager.urls(for: .documentDirectory, in: .userDomainMask)[0]
let asset = AVAsset(url: sourceURL)
let length = Float(asset.duration.value) / Float(asset.duration.timescale)
print("video length: \(length) seconds")
var outputURL = documentDirectory.appendingPathComponent("output")
do {
try fileManager.createDirectory(at: outputURL, withIntermediateDirectories: true, attributes: nil)
outputURL = outputURL.appendingPathComponent("\(sourceURL.lastPathComponent).mp4")
}catch let error {
print(error)
}
//Remove existing file
try? fileManager.removeItem(at: outputURL)
guard let exportSession = AVAssetExportSession(asset: asset, presetName: AVAssetExportPresetHighestQuality) else { return }
exportSession.outputURL = outputURL
exportSession.outputFileType = .mp4
let timeRange = CMTimeRange(start: CMTime(seconds: startTime, preferredTimescale: 1000),
end: CMTime(seconds: endTime, preferredTimescale: 1000))
exportSession.timeRange = timeRange
exportSession.exportAsynchronously {
switch exportSession.status {
case .completed:
print("exported at \(outputURL)")
completion?(outputURL)
case .failed:
print("failed \(exportSession.error.debugDescription)")
case .cancelled:
print("cancelled \(exportSession.error.debugDescription)")
default: break
}
}
}
func cropVideo1(_ sourceURL1: URL, statTime:Float, endTime:Float){
let videoAsset: AVAsset = AVAsset(url: sourceURL1) as AVAsset
let composition = AVMutableComposition()
composition.addMutableTrack(withMediaType: AVMediaTypeVideo, preferredTrackID: CMPersistentTrackID())
let videoComposition = AVMutableVideoComposition()
videoComposition.renderSize = CGSize(width: 1280, height: 768)
videoComposition.frameDuration = CMTimeMake(8, 15)
let instruction = AVMutableVideoCompositionInstruction()
let length = Float(videoAsset.duration.value)
print(length)
instruction.timeRange = CMTimeRangeMake(kCMTimeZero, CMTimeMakeWithSeconds(60, 30))
let start = statTime
let end = endTime
let exportSession = AVAssetExportSession(asset: videoAsset, presetName: AVAssetExportPresetHighestQuality)!
exportSession.outputFileType = AVFileTypeMPEG4
let startTime = CMTime(seconds: Double(start ), preferredTimescale: 1000)
let endTime = CMTime(seconds: Double(end ), preferredTimescale: 1000)
let timeRange = CMTimeRange(start: startTime, end: endTime)
exportSession.timeRange = timeRange
let formatter = DateFormatter()
formatter.dateFormat = "yyyy'-'MM'-'dd'T'HH':'mm':'ss'Z'"
let date = Date()
let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as NSString
let outputPath = "\(documentsPath)/\(formatter.string(from: date)).mp4"
let outputURL = URL(fileURLWithPath: outputPath)
exportSession.outputURL = outputURL
exportSession.outputFileType = AVFileTypeQuickTimeMovie
print("sucess")
exportSession.exportAsynchronously(completionHandler: { () -> Void in
DispatchQueue.main.async(execute: {
self.exportDidFinish(exportSession)
print("sucess")
})
})
}
func exportDidFinish(_ session: AVAssetExportSession) {
if session.status == AVAssetExportSessionStatus.completed {
let outputURL = session.outputURL
let library = ALAssetsLibrary()
if library.videoAtPathIs(compatibleWithSavedPhotosAlbum: outputURL) {
library.writeVideoAtPath(toSavedPhotosAlbum: outputURL) { alAssetURL, error in
if error != nil {
DispatchQueue.main.async(execute: {
print("Failed to save video")
})
} else {
DispatchQueue.main.async(execute: {
Print("Sucessfully saved Video")
})
}
self.activityIndicator.stopAnimating()
}
}
}
}