2

しばらくの間、ビデオにテキスト字幕を追加するのに苦労しています。詳細に参照したリンクをいくつか追加しましたが、役に立ちません。

以下のコードでは、ビデオに字幕を追加しようとしています。出力ファイルのパスは次のとおりです。

file:///var/mobile/Applications/03E49B29-1070-4541-B7CB-B1366732C179/Documents/output_movie.mov

さらに、入力ファイルは、同じアプリケーションの UIPickerView への呼び出しで、以下の一時パスに記録されました。

file:///private/var/mobile/Applications/03E49B29-1070-4541-B7CB-B1366732C179/tmp/capture/capturedvideo.MOV

私が得ているエラーは次のとおりです。

Error:-
Domain=AVFoundationErrorDomain Code=-11841 "Operation Stopped" UserInfo=0x15ebcfb0 {NSLocalizedDescription=Operation Stopped, NSLocalizedFailureReason=The video could not be composed.}

Description:-
<AVAssetExportSession: 0x15d97c80, asset = <AVMutableComposition: 0x15d788d0 tracks = ("<AVMutableCompositionTrack: 0x15d86910 trackID = 1, mediaType = vide, editCount = 1>")>, presetName = AVAssetExportPresetHighestQuality, outputFileType = com.apple.quicktime-movie

Completed merging the video with status code 4

私が使用しているコードは以下の通りです。iPhone 4s の iOS 7.1.2 で実行しています。

class func mergeVideoWithTheme(outputUrl: NSURL, inputVideoUrl videoUrl: NSURL!, onComplete completionHandler: ((Int) -> ())!) -> Void {

    // 1. mergeComposition adds all the AVAssets

    var mergeComposition : AVMutableComposition = AVMutableComposition()
    var trackVideo : AVMutableCompositionTrack = mergeComposition.addMutableTrackWithMediaType(AVMediaTypeVideo, preferredTrackID: CMPersistentTrackID())
    //var trackAudio : AVMutableCompositionTrack = mergeComposition.addMutableTrackWithMediaType(AVMediaTypeAudio, preferredTrackID: CMPersistentTrackID())

    // 2. Add a bank for theme insertion later

    //trackVideo.insertTimeRange(range, ofTrack: VideoHelper.Static.blankTrack, atTime: kCMTimeZero, error: nil)

    // 3. Source tracks

    let sourceAsset = AVURLAsset(URL: videoUrl, options: nil)
    let sourceDuration = CMTimeRangeMake(kCMTimeZero, sourceAsset.duration)
    let vtrack: AVAssetTrack? = sourceAsset.tracksWithMediaType(AVMediaTypeVideo)[0] as? AVAssetTrack
    let atrack: AVAssetTrack? = sourceAsset.tracksWithMediaType(AVMediaTypeAudio)[0] as? AVAssetTrack

    if (vtrack == nil) {
        return
    }

    let renderWidth = vtrack?.naturalSize.width
    let renderHeight = vtrack?.naturalSize.height
    let insertTime = kCMTimeZero
    let endTime = sourceAsset.duration
    let range = sourceDuration

    // append tracks

    trackVideo.insertTimeRange(sourceDuration, ofTrack: vtrack, atTime: insertTime, error: nil)
    //if(atrack > 0){
    //    trackAudio.insertTimeRange(sourceDuration, ofTrack: atracks[0] as AVAssetTrack, atTime: insertTime, error: nil)
    //}

    // 4. Add subtitles (we call it theme)

    var themeVideoComposition : AVMutableVideoComposition = AVMutableVideoComposition(propertiesOfAsset: sourceAsset)

    // 4.1 - Create AVMutableVideoCompositionInstruction

    let mainInstruction: AVMutableVideoCompositionInstruction = AVMutableVideoCompositionInstruction()
    mainInstruction.timeRange = range

    // 4.2 - Create an AVMutableVideoCompositionLayerInstruction for the video track and fix the orientation.

    let videolayerInstruction : AVMutableVideoCompositionLayerInstruction = AVMutableVideoCompositionLayerInstruction()
    videolayerInstruction.setTransform(trackVideo.preferredTransform, atTime: insertTime)
    videolayerInstruction.setOpacity(0.0, atTime: endTime)

    // 4.3 - Add instructions

    mainInstruction.layerInstructions = NSArray(array: [videolayerInstruction])

    themeVideoComposition.renderScale = 1.0
    themeVideoComposition.renderSize = CGSizeMake(renderWidth!, renderHeight!)
    themeVideoComposition.frameDuration = CMTimeMake(1, 30)
    themeVideoComposition.instructions = NSArray(array: [mainInstruction])

    // add the theme

    // setup variables

    // add text

    let title = String("Testing this subtitle")

    var titleLayer = CATextLayer()
    titleLayer.string = title
    titleLayer.frame =  CGRect(x: 0, y: 0, width: renderWidth!, height: renderHeight!)
    let fontName: CFStringRef = "Helvetica-Bold"
    let fontSize = CGFloat(36)
    titleLayer.font = CTFontCreateWithName(fontName, fontSize, nil)
    titleLayer.alignmentMode = kCAAlignmentCenter
    titleLayer.foregroundColor = UIColor.whiteColor().CGColor

    var backgroundLayer = CALayer()
    backgroundLayer.frame = CGRect(x: 0, y: 0, width: renderWidth!, height: renderHeight!)
    backgroundLayer.masksToBounds = true
    backgroundLayer.addSublayer(titleLayer)

    // 2. set parent layer and video layer

    var parentLayer = CALayer()
    var videoLayer = CALayer()
    parentLayer.frame =  CGRect(x: 0, y: 0, width: renderWidth!, height: renderHeight!)
    videoLayer.frame =  CGRect(x: 0, y: 0, width: renderWidth!, height: renderHeight!)

    parentLayer.addSublayer(backgroundLayer)
    parentLayer.addSublayer(videoLayer)

    // 3. make animation

    themeVideoComposition.animationTool = AVVideoCompositionCoreAnimationTool(postProcessingAsVideoLayer: videoLayer, inLayer: parentLayer)

    // Remove the file if it already exists (merger does not overwrite)

    let fileManager = NSFileManager.defaultManager()
    fileManager.removeItemAtURL(outputUrl, error: nil)

    // export to output url

    var exporter = AVAssetExportSession(asset: mergeComposition, presetName: AVAssetExportPresetHighestQuality)
    exporter.outputURL = outputUrl
    exporter.videoComposition = themeVideoComposition
    exporter.outputFileType = AVFileTypeQuickTimeMovie
    exporter.shouldOptimizeForNetworkUse = true
    exporter.exportAsynchronouslyWithCompletionHandler({
        if (exporter.error != nil) {
            println("Error")
            println(exporter.error)
            println("Description")
            println(exporter.description)
        }
        completionHandler(exporter.status.rawValue)
    })
}

ご協力をお願いいたします。ビデオにアニメーションを追加する簡単な例は見つかりませんでした。それが迅速に誰にとってもうまくいったかどうか疑問に思っています。

参照 : (1) https://gist.github.com/SheffieldKevin/c01789ccff2b2a87f5ea (2) http://www.raywenderlich.com/30200/avfoundation-tutorial-adding-overlays-and-animations-to-videos

4

3 に答える 3

2

レイヤ命令の作成時にトラック ID の挿入に失敗しました。試す ：

let videolayerInstruction : AVMutableVideoCompositionLayerInstruction = AVMutableVideoCompositionLayerInstruction(vtrack)
于 2015-07-11T05:54:08.737 に答える
0

これを試したところ、字幕が表示されませんでした。サブレイヤーの順序を入れ替えて修正しました。

すなわち

parentLayer.addSublayer(videoLayer)

parentLayer.addSubLayer(backgroundLayer)

于 2016-07-11T22:53:23.803 に答える