Video Download/Disk Cache in iOS : Swift

Video is one of the most vital kind of content now a days. Every application may need to have some kind of video content to tempt their users. But problem comes when app needs to get data for same video number of times, this is not fair for our app user as we are unnecessarily consuming user network data. Specially for short videos, a user can play the same track five times a day and he can fell asleep😴🥱 while looking at loading activity if it appears every time, other case as if you are on Mars 😄 😄 or in a cave and want to enjoy your favourite videos, you may see a message like “No Internet Available” 😔😔. As an application Developer, a first question comes to your mind - Can we cache few most recent videos to improve our user experience? In this article I am going to explore couple of techniques to cache video content on disk using AVFoundation family.

---

1. Using AVAssetExportSession

AVAssetExportSession is one of the straight forward way to download video and save it to disk. First we create AVURLAsset and compose audio and video files as shown in below code snippet :

private func exportVideo(forAsset asset: AVURLAsset) {
	        if !asset.isExportable { return }
	        //1
	        let composition = AVMutableComposition()

	        //2
	        if let compositionVideoTrack = composition.addMutableTrack(withMediaType: AVMediaType.video, preferredTrackID: CMPersistentTrackID(kCMPersistentTrackID_Invalid)),
	           let sourceVideoTrack = asset.tracks(withMediaType: .video).first {
	            do {
	                try compositionVideoTrack.insertTimeRange(CMTimeRangeMake(start: CMTime.zero, duration: asset.duration), of: sourceVideoTrack, at: CMTime.zero)
	            } catch {
	                print("Failed to compose video file")
	                return
	            }
	        }
	        //3
	        if let compositionAudioTrack = composition.addMutableTrack(withMediaType: AVMediaType.audio, preferredTrackID: CMPersistentTrackID(kCMPersistentTrackID_Invalid)),
	           let sourceAudioTrack = asset.tracks(withMediaType: .audio).first {
	            do {
	                try compositionAudioTrack.insertTimeRange(CMTimeRangeMake(start: CMTime.zero, duration: asset.duration), of: sourceAudioTrack, at: CMTime.zero)
	            } catch {
	                print("Failed to compose audio file")
	                return
	            }
	        }

	        //4
	        guard let exporter = AVAssetExportSession(asset: composition, presetName: AVAssetExportPresetMediumQuality) else {
	            print("Failed to create export session")
	            return
	        }

	        //5
	        let fileName = asset.url.lastPathComponent
	        let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).last!
	        let dirPath = documentsDirectory.appendingPathComponent("Video")
	        let outputURL = dirPath.appendingPathComponent(fileName)
	        print("File path: \(outputURL)")

	        exporter.outputURL = outputURL
	        exporter.outputFileType = AVFileType.mp4

	        //6
	        exporter.exportAsynchronously {
	            if let error = exporter.error {
	                print("Error \(error)")
	            } else {
	                 print("Exporter completed")
	            }
	        }
	    }

#video-downloader #avfoundation #ios #video-cache #swift

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Video Download/Disk Cache in iOS : Swift

Video is one of the most vital kind of content now a days. Every application may need to have some kind of video content to tempt their users. But problem comes when app needs to get data for same video number of times, this is not fair for our app user as we are unnecessarily consuming user network data. Specially for short videos, a user can play the same track five times a day and he can fell asleep😴🥱 while looking at loading activity if it appears every time, other case as if you are on Mars 😄 😄 or in a cave and want to enjoy your favourite videos, you may see a message like “No Internet Available” 😔😔. As an application Developer, a first question comes to your mind - Can we cache few most recent videos to improve our user experience? In this article I am going to explore couple of techniques to cache video content on disk using AVFoundation family.

---

1. Using AVAssetExportSession

AVAssetExportSession is one of the straight forward way to download video and save it to disk. First we create AVURLAsset and compose audio and video files as shown in below code snippet :

private func exportVideo(forAsset asset: AVURLAsset) {
	        if !asset.isExportable { return }
	        //1
	        let composition = AVMutableComposition()

	        //2
	        if let compositionVideoTrack = composition.addMutableTrack(withMediaType: AVMediaType.video, preferredTrackID: CMPersistentTrackID(kCMPersistentTrackID_Invalid)),
	           let sourceVideoTrack = asset.tracks(withMediaType: .video).first {
	            do {
	                try compositionVideoTrack.insertTimeRange(CMTimeRangeMake(start: CMTime.zero, duration: asset.duration), of: sourceVideoTrack, at: CMTime.zero)
	            } catch {
	                print("Failed to compose video file")
	                return
	            }
	        }
	        //3
	        if let compositionAudioTrack = composition.addMutableTrack(withMediaType: AVMediaType.audio, preferredTrackID: CMPersistentTrackID(kCMPersistentTrackID_Invalid)),
	           let sourceAudioTrack = asset.tracks(withMediaType: .audio).first {
	            do {
	                try compositionAudioTrack.insertTimeRange(CMTimeRangeMake(start: CMTime.zero, duration: asset.duration), of: sourceAudioTrack, at: CMTime.zero)
	            } catch {
	                print("Failed to compose audio file")
	                return
	            }
	        }

	        //4
	        guard let exporter = AVAssetExportSession(asset: composition, presetName: AVAssetExportPresetMediumQuality) else {
	            print("Failed to create export session")
	            return
	        }

	        //5
	        let fileName = asset.url.lastPathComponent
	        let documentsDirectory = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).last!
	        let dirPath = documentsDirectory.appendingPathComponent("Video")
	        let outputURL = dirPath.appendingPathComponent(fileName)
	        print("File path: \(outputURL)")

	        exporter.outputURL = outputURL
	        exporter.outputFileType = AVFileType.mp4

	        //6
	        exporter.exportAsynchronously {
	            if let error = exporter.error {
	                print("Error \(error)")
	            } else {
	                 print("Exporter completed")
	            }
	        }
	    }

#video-downloader #avfoundation #ios #video-cache #swift

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