问题
Im using this below method to download and save my video to gallery, with .mp4 it's work normally, but when change to .m3u8 it's always fail.
func downloadVideoLinkAndCreateAsset(_ videoLink: String,_ fileName : String) {
// use guard to make sure you have a valid url
guard let videoURL = URL(string: videoLink) else { return }
guard let documentsDirectoryURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first else { return }
let fileNameToSave = "CiviX_HistoryVideo_\(fileName)"
// check if the file already exist at the destination folder if you don't want to download it twice
if !FileManager.default.fileExists(atPath: documentsDirectoryURL.appendingPathComponent(fileNameToSave).path) {
// set up your download task
URLSession.shared.downloadTask(with: videoURL) { (location, response, error) -> Void in
// use guard to unwrap your optional url
guard let location = location else { return }
// create a deatination url with the server response suggested file name
let destinationURL = documentsDirectoryURL.appendingPathComponent(fileNameToSave)
print("destinationURL: \(destinationURL)")
do {
try FileManager.default.moveItem(at: location, to: destinationURL)
PHPhotoLibrary.requestAuthorization({ (authorizationStatus: PHAuthorizationStatus) -> Void in
// check if user authorized access photos for your app
if authorizationStatus == .authorized {
PHPhotoLibrary.shared().performChanges({
PHAssetChangeRequest.creationRequestForAssetFromVideo(atFileURL: destinationURL)}) { completed, error in
if completed {
print("Video asset created")
} else {
print("Video asset create failed: \(error?.localizedDescription)")
}
}
}
})
} catch { print("file manager error: \(error.localizedDescription)") }
}.resume()
} else {
print("File already exists at destination url")
}
}
then here is method to call
let urlString = response.replacingOccurrences(of: "\"", with: "") -> my m3u8 URL
let videoImageUrl = "https://www.sample-videos.com/video123/mp4/720/big_buck_bunny_720p_1mb.mp4" -> always success
//TEST MP4 file -> ALWAYS SUCCESS
self.downloadVideoLinkAndCreateAsset(videoImageUrl, "big_buck_bunny_720p_1mb.mp4")
//TEST M3U8 FIlE -> FAIL
self.downloadVideoLinkAndCreateAsset(urlString, history.fileName!) -> fileName format is 'abc.mp4'
The log result for MP4
destinationURL: file:///Users/thehe/Library/Developer/CoreSimulator/Devices/05C6DE76-6609-4E4A-B00D-2CE3622D2EF8/data/Containers/Data/Application/90994674-6C07-47F9-A880-D1A80CDA0C27/Documents/CiviX_HistoryVideo_big_buck_bunny_720p_1mb.mp4
-> Video asset created
THe log result for M3U8
self.downloadVideoLinkAndCreateAsset(urlString, history.fileName!)
destinationURL: file:///Users/thehe/Library/Developer/CoreSimulator/Devices/05C6DE76-6609-4E4A-B00D-2CE3622D2EF8/data/Containers/Data/Application/DA6ABC38-4E0A-44C7-9C56-8B65F1DC0D4D/Documents/CiviX_HistoryVideo_20-1-2019_3h18m32s.mp4
-> Video asset create failed: Optional("The operation couldn’t be completed. (Cocoa error -1.)")
I also tried to save with .m3u8 extension but still not working
self.downloadVideoLinkAndCreateAsset(urlString, "TEST_M3U8_FILE.m3u8")
destinationURL: file:///Users/thehe/Library/Developer/CoreSimulator/Devices/05C6DE76-6609-4E4A-B00D-2CE3622D2EF8/data/Containers/Data/Application/9B42A55B-4E3E-4A20-A0DC-6E1ED22471A2/Documents/CiviX_HistoryVideo_TEST_M3U8_FILE.m3u8
-> Video asset create failed: Optional("The operation couldn’t be completed. (Cocoa error -1.)")
回答1:
M3U8 is an audio/video playlist file and it cannot be saved to the gallery.
来源：https://stackoverflow.com/questions/54274457/swift-can-not-save-m3u8-file-to-gallery