Compression is too slow

[Jay Mehta]

I tried to compress a 6 seconds video of 2.5 MB and it took 2.5 minutes. I also tried to compress a video of 14.5 minutes and it took more than 2 hours. I followed the same process as given in readme. It does compress the video but the amount of time it takes is too high. Please help. Thanks!

[Ali Bolak]

Hey, I am having the same issue, obviously, this is too long for a mobile app. Let me know if you found a way to speed it up or found another library to do this?

[Jay Mehta]

Hi @bolak2 , I have found a solution to this but its not very customisable and very straight forward.

Here is the code :-

extension PreviewVideoViewController: AVCaptureFileOutputRecordingDelegate {
    func capture(_ captureOutput: AVCaptureFileOutput!, didFinishRecordingToOutputFileAt outputFileURL: URL!, fromConnections connections: [Any]!, error: Error!) {
        guard let data = NSData(contentsOf: outputFileURL as URL) else {
            return
        }

        print("File size before compression: \(Double(data.length / 1048576)) mb")
        let compressedURL = NSURL.fileURL(withPath: NSTemporaryDirectory() + NSUUID().uuidString + ".m4v")
        compressVideo(inputURL: outputFileURL as URL, outputURL: compressedURL) { (exportSession) in
            guard let session = exportSession else {
                return
            }

            switch session.status {
            case .unknown:
                break
            case .waiting:
                break
            case .exporting:
                break
            case .completed:
                guard let compressedData = NSData(contentsOf: compressedURL) else {
                    return
                }

                print("File size after compression: \(Double(compressedData.length / 1048576)) mb")
            case .failed:
                break
            case .cancelled:
                break
            }
        }
    }

    func compressVideo(inputURL: URL, outputURL: URL, handler:@escaping (_ exportSession: AVAssetExportSession?)-> Void) {
        let urlAsset = AVURLAsset(url: inputURL, options: nil)
        guard let exportSession = AVAssetExportSession(asset: urlAsset, presetName: AVAssetExportPresetMediumQuality) else {
            handler(nil)

            return
        }

        exportSession.outputURL = outputURL
        exportSession.outputFileType = AVFileTypeQuickTimeMovie
        exportSession.shouldOptimizeForNetworkUse = true
        exportSession.exportAsynchronously { () -> Void in
            handler(exportSession)
        }
    }
}

I found this code from this link :-
https://stackoverflow.com/questions/40470637/swift-compressing-video-files

The only thing you can modify here is the presetName which controls the quality.

Hope it helps.

[Diego Perini]

Hi everyone, maintainer here. Sorry to hear that compression takes longer than expected. Without compiling an encoder such as ffmpeg from its C source with latest optimizations, this will be an hard issue to solve. If it is not too much trouble, can I ask you to provide the configurations you have tried (bitrate, other params etc) and the corresponding encoding durations?

[Orest Patlyka]

@JayMehta97, @bolak2 try to configure compressQueue like this:
fileprivate let compressQueue = DispatchQueue(label: "compressQueue", qos: .userInitiated, attributes: [.concurrent])