播放通过CloudKit下载的视频作为CKAsset - iOS
播放通过CloudKit下载的视频作为CKAsset - iOS
提问于 2015-10-01 02:03:56
我正在制作一个应用程序，它记录视频，用CloudKit将视频上传到CKAsset，然后下载该文件并在AVPlayer中播放。这都是用Swift 2.0编写的
我已经下载了数据，我想我已经能够引用它了，但我不确定。当我将URL转换为NSData对象并将其打印到控制台时，数据/垃圾就会打印出来。但是，视频文件作为二进制文件下载。我能够访问CloudKit仪表板并下载文件并将'.mov‘附加到其中，并且它在Quicktime中打开没有问题。
因此，我认为我的主要问题是，我无法解决如何让视频文件实际播放，因为该文件没有扩展名。我尝试过在结尾添加“.mov”，但URLByAppendingPathExtension()没有效果。让我知道任何想法！
上传视频
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
let tempURL = info[UIImagePickerControllerMediaURL] as! NSURL
dismissViewControllerAnimated(true) { () -> Void in
self.uploadVideoToiCloud(tempURL)
print("\n Before Upload: \(tempURL)\n")
}
}
func uploadVideoToiCloud(url: NSURL) {
let videoRecord = CKRecord(recordType: "video", recordID: id)
videoRecord["title"] = "This is the title"
let videoAsset = CKAsset(fileURL: url)
videoRecord["video"] = videoAsset
CKContainer.defaultContainer().privateCloudDatabase.saveRecord(videoRecord) { (record, error) -> Void in
dispatch_async(dispatch_get_main_queue(), { () -> Void in
if error == nil {
print("upload successful")
} else {
print(error!)
}
})
}
}下载录影带
func downloadVideo(id: CKRecordID) {
privateDatabase.fetchRecordWithID(id) { (results, error) -> Void in
dispatch_async(dispatch_get_main_queue()) { () -> Void in
if error != nil {
print(" Error Fetching Record " + error!.localizedDescription)
} else {
if results != nil {
print("pulled record")
let record = results!
let videoFile = record.objectForKey("video") as! CKAsset
self.videoURL = videoFile.fileURL
print(" After Download: \(self.videoURL!)")
self.videoAsset = AVAsset(URL: self.videoURL!)
self.playVideo()
} else {
print("results Empty")
}
}
}
}
}回答 3
Stack Overflow用户
回答已采纳
发布于 2015-10-01 02:41:35
解决方案的结果是，在将数据写入文件名之前，我忘记指定文件名。我使用的是URLByAppendingPathExtension，它破坏了URL，最后使用了URLByAppendingPathComponent并在那里添加了一个文件名。这是对我有效的解决办法！谢谢各位的评论。
func downloadVideo(id: CKRecordID) {
privateDatabase.fetchRecordWithID(id) { (results, error) -> Void in
dispatch_async(dispatch_get_main_queue()) { () -> Void in
if error != nil {
print(" Error Fetching Record " + error!.localizedDescription)
} else {
if results != nil {
print("pulled record")
let record = results as CKRecord!
let videoFile = record.objectForKey("video") as! CKAsset
self.videoURL = videoFile.fileURL as NSURL!
let videoData = NSData(contentsOfURL: self.videoURL!)
let documentsPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0]
let destinationPath = NSURL(fileURLWithPath: documentsPath).URLByAppendingPathComponent("filename.mov", isDirectory: false) //This is where I messed up.
NSFileManager.defaultManager().createFileAtPath(destinationPath.path!, contents:videoData, attributes:nil)
self.videoURL = destinationPath
self.videoAsset = AVURLAsset(URL: self.videoURL!)
self.playVideo()
} else {
print("results Empty")
}
}
}
}
}Stack Overflow用户
发布于 2016-05-24 14:12:15
根本的问题是，AVPlayer需要一个文件扩展名，例如.mov，但是CKAsset的fileURL属性指向一个缺少扩展名的文件。最干净的解决方案是创建一个硬链接，避免在周围移动兆字节的数据，并且不需要磁盘空间：
- (NSURL *)videoURL {
return [self createHardLinkToVideoFile];
}
- (NSURL *)createHardLinkToVideoFile {
NSError *err;
if (![self.hardURL checkResourceIsReachableAndReturnError:nil]) {
if (![[NSFileManager defaultManager] linkItemAtURL:self.asset.fileURL toURL:self.hardURL error:&err]) {
// if creating hard link failed it is still possible to create a copy of self.asset.fileURL and return the URL of the copy
}
}
return self.hardURL;
}
- (void)removeHardLinkToVideoFile {
NSError *err;
if ([self.hardURL checkResourceIsReachableAndReturnError:nil]) {
if (![[NSFileManager defaultManager] removeItemAtURL:self.hardURL error:&err]) {
}
}
}
- (NSURL *)hardURL {
return [self.asset.fileURL URLByAppendingPathExtension:@"mov"];
}然后在视图控制器中，将AVPlayer指向videoURL而不是asset.fileURL。
Stack Overflow用户
发布于 2022-01-21 07:23:58
以下是从CloudKit下载多个视频的解决方案。使用它，您可以将视频存储在多个目标上，并轻松获取文件路径。
import AVKit
import CloudKit
var assetForVideo = [CKAsset]()
var videoURLForGetVideo = NSURL()
database.perform(queryForVideo, inZoneWith: nil) { [weak self] record, Error in
guard let records = record, Error == nil else {
return
}
DispatchQueue.main.async { [self] in
self?.assetForVideo = records.compactMap({ $0.value(forKey: "video") as? CKAsset })
for (i,dt) in self!.assetForVideo.enumerated(){
self!.videoURLForGetVideo = (dt.fileURL as NSURL?)!
let videoData = NSData(contentsOf: self!.videoURLForGetVideo as URL)
let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0]
let destinationPath = NSURL(fileURLWithPath: documentsPath).appendingPathComponent(self!.assetForVideo.count == i ? "filename\(self!.assetForVideo.count).mov" : "filename\(i+1).mov", isDirectory: false)! as NSURL
FileManager.default.createFile(atPath: destinationPath.path!, contents: videoData as Data?, attributes: nil)
self?.videoURLForGetVideo = destinationPath
self!.videoAssett = AVURLAsset(url: self!.videoURLForGetVideo as URL)
let abc = self!.videoAssett.url
let videoURL = URL(string: "\(abc)")
}
}
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/32878358
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