NextLevelSessionExporter 🔄

NextLevelSessionExporter is an export and transcode media library for iOS written in Swift.

The library provides customizable audio and video encoding options unlike AVAssetExportSession and without having to learn the intricacies of AVFoundation. It was a port of SDAVAssetExportSession with inspiration from SCAssetExportSession – which are great obj-c alternatives.

• Looking for a capture library? Check out NextLevel.
• Looking for a video player? Check out Player

Need a different version of Swift?

• 5.0 - Target your Podfile to the latest release or master
• 4.2 - Target your Podfile to the swift4.2 branch
• 4.0 - Target your Podfile to the swift4.0 branch

Quick Start

# CocoaPods

pod "NextLevelSessionExporter", "~> 0.4.0"

# Carthage

github "nextlevel/NextLevelSessionExporter" ~> 0.4.0

# Swift PM

let package = Package(
    dependencies: [
        .Package(url: "https://github.com/nextlevel/NextLevelSessionExporter", majorVersion: 0)
    ]
)

Alternatively, drop the source files into your Xcode project.

Example

Simply use the AVAsset extension or create and use an instance of NextLevelSessionExporter directly.

let tmpURL = URL(fileURLWithPath: NSTemporaryDirectory(), isDirectory: true)
    .appendingPathComponent(ProcessInfo().globallyUniqueString)
    .appendingPathExtension("mp4")
exporter.outputURL = tmpURL

let compressionDict: [String: Any] = [
    AVVideoAverageBitRateKey: NSNumber(integerLiteral: 6000000),
    AVVideoProfileLevelKey: AVVideoProfileLevelH264HighAutoLevel as String,
]
let videoOutputConfig = [
    AVVideoCodecKey: AVVideoCodec.h264,
    AVVideoWidthKey: NSNumber(integerLiteral: 1920),
    AVVideoHeightKey: NSNumber(integerLiteral: 1080),
    AVVideoScalingModeKey: AVVideoScalingModeResizeAspectFill,
    AVVideoCompressionPropertiesKey: compressionDict
]
let audioOutputConfig = [
    AVFormatIDKey: kAudioFormatMPEG4AAC,
    AVEncoderBitRateKey: NSNumber(integerLiteral: 128000),
    AVNumberOfChannelsKey: NSNumber(integerLiteral: 2),
    AVSampleRateKey: NSNumber(value: Float(44100))
]

let asset = AVAsset(url: Bundle.main.url(forResource: "TestVideo", withExtension: "mov")!)
asset.nextlevel_export(outputURL: tmpURL, videoOutputConfiguration: videoOutputConfig, audioOutputConfiguration: audioOutputConfig)

Alternatively, you can use NextLevelSessionExporter directly.

let exporter = NextLevelSessionExporter(withAsset: asset)
exporter.outputFileType = AVFileType.mp4
let tmpURL = URL(fileURLWithPath: NSTemporaryDirectory(), isDirectory: true)
    .appendingPathComponent(ProcessInfo().globallyUniqueString)
    .appendingPathExtension("mp4")
exporter.outputURL = tmpURL

let compressionDict: [String: Any] = [
    AVVideoAverageBitRateKey: NSNumber(integerLiteral: 6000000),
    AVVideoProfileLevelKey: AVVideoProfileLevelH264HighAutoLevel as String,
]
exporter.videoOutputConfiguration = [
    AVVideoCodecKey: AVVideoCodec.h264,
    AVVideoWidthKey: NSNumber(integerLiteral: 1920),
    AVVideoHeightKey: NSNumber(integerLiteral: 1080),
    AVVideoScalingModeKey: AVVideoScalingModeResizeAspectFill,
    AVVideoCompressionPropertiesKey: compressionDict
]
exporter.audioOutputConfiguration = [
    AVFormatIDKey: kAudioFormatMPEG4AAC,
    AVEncoderBitRateKey: NSNumber(integerLiteral: 128000),
    AVNumberOfChannelsKey: NSNumber(integerLiteral: 2),
    AVSampleRateKey: NSNumber(value: Float(44100))
]

exporter.export(progressHandler: { (progress) in
    print(progress)
}, completionHandler: { result in
    switch result {
    case .success(let status):
        switch status {
        case .completed:
            print("NextLevelSessionExporter, export completed, \(exporter.outputURL?.description ?? "")")
            break
        default:
            print("NextLevelSessionExporter, did not complete")
            break
        }
        break
    case .failure(let error):
        print("NextLevelSessionExporter, failed to export \(error)")
        break
    }
})

Documentation

You can find the docs here. Documentation is generated with jazzy and hosted on GitHub-Pages.

Community

• Found a bug? Open an issue.
• Feature idea? Open an issue.
• Want to contribute? Submit a pull request.

Resources

• AV Foundation Programming Guide
• AV Foundation Framework Reference
• NextLevel, Rad Media Capture in Swift
• GPUImage2, image processing library in Swift
• SDAVAssetExportSession, media transcoding library in obj-c

License

NextLevelSessionExporter is available under the MIT license, see the LICENSE file for more information.