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@@ -0,0 +1,65 @@
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+import Foundation
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+import AVKit
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+
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+extension URL {
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+ enum ConversionError: Error {
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+ case runtimeError(String)
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+ }
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+
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+ public var queryParameters: [String: String]? {
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+ guard
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+ let components = URLComponents(url: self, resolvingAgainstBaseURL: true),
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+ let queryItems = components.queryItems else { return nil }
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+ return queryItems.reduce(into: [String: String]()) { result, item in
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+ result[item.name] = item.value
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+ }
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+ }
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+
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+ public func convertToMp4(completionHandler: ((URL?, Error?) -> Void)?) {
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+ let avAsset = AVURLAsset(url: self, options: nil)
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+ AVAssetExportSession.determineCompatibility(ofExportPreset: AVAssetExportPresetPassthrough,
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+ with: avAsset,
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+ outputFileType: .mp4,
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+ completionHandler: { (isCompatible) in
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+ if !isCompatible {
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+ completionHandler?(nil, ConversionError.runtimeError("File has incompatible file format for mp4 conversion"))
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+ return
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+ }
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+
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+ guard let exportSession = AVAssetExportSession(asset: avAsset, presetName: AVAssetExportPresetPassthrough) else {
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+ completionHandler?(nil, ConversionError.runtimeError("Could not initiate AVAssertExportSession"))
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+ return
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+ }
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+
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+ let filename = self.deletingPathExtension().lastPathComponent.replacingOccurrences(of: ".", with: "-").appending(".mp4")
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+ let outputURL = FileManager.default.temporaryDirectory.appendingPathComponent(filename)
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+
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+ if FileManager.default.fileExists(atPath: outputURL.path) {
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+ do {
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+ try FileManager.default.removeItem(at: outputURL)
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+ } catch {
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+ completionHandler?(nil, error)
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+ }
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+ }
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+
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+ exportSession.outputURL = outputURL
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+ exportSession.outputFileType = AVFileType.mp4
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+ exportSession.shouldOptimizeForNetworkUse = true
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+ let start = CMTimeMakeWithSeconds(0.0, preferredTimescale: 0)
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+ let range = CMTimeRangeMake(start: start, duration: avAsset.duration)
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+ exportSession.timeRange = range
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+
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+ exportSession.exportAsynchronously(completionHandler: {() -> Void in
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+ switch exportSession.status {
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+ case .failed:
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+ completionHandler?(nil, exportSession.error)
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+ case .cancelled:
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+ completionHandler?(nil, nil)
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+ case .completed:
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+ completionHandler?(exportSession.outputURL, nil)
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+ default: break
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+ }
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+ })
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+ })
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+ }
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+}
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björn petersen