iOS旋转视频AVA [英] iOS rotate video AVAsset avfoundation

问题描述

示例

努力旋转此视频以正确的方向显示并填充整个屏幕.

Struggling to rotate this video to show in the proper orientation and fill the entire screen.

我无法通过视频补偿获得Avasset，但无法使其正常工作.

I cannot get the avasset with videocompisition but cannot get it to work correctly.

    let videoAsset: AVAsset = AVAsset(URL: outputFileURL) as AVAsset

    let clipVideoTrack = videoAsset.tracksWithMediaType(AVMediaTypeVideo).first! as AVAssetTrack

    let newHeight = CGFloat(clipVideoTrack.naturalSize.height/3*4)

    let composition = AVMutableComposition()
    composition.addMutableTrackWithMediaType(AVMediaTypeVideo, preferredTrackID: CMPersistentTrackID())

    let videoComposition = AVMutableVideoComposition()
    var videoSize = CGSize()
    videoSize = clipVideoTrack.naturalSize
    videoComposition.renderSize = videoSize
    videoComposition.frameDuration = CMTimeMake(1, 30)

    let instruction = AVMutableVideoCompositionInstruction()

    instruction.timeRange = CMTimeRangeMake(kCMTimeZero, CMTimeMakeWithSeconds(180, 30))

    // rotate to portrait
    let transformer:AVMutableVideoCompositionLayerInstruction = AVMutableVideoCompositionLayerInstruction(assetTrack: clipVideoTrack)
    let t1 = CGAffineTransformMakeTranslation(0, 0);
    let t2 = CGAffineTransformRotate(t1, CGFloat(M_PI_2));

    transformer.setTransform(t2, atTime: kCMTimeZero)
    instruction.layerInstructions = [transformer]
    videoComposition.instructions = [instruction]

    let formatter = NSDateFormatter()
    formatter.dateFormat = "yyyy'-'MM'-'dd'T'HH':'mm':'ss'Z'"
    let date = NSDate()
    let documentsPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0] as NSString
    let outputPath = "\(documentsPath)/\(formatter.stringFromDate(date)).mp4"
    let outputURL = NSURL(fileURLWithPath: outputPath)

    let exporter = AVAssetExportSession(asset: videoAsset, presetName: AVAssetExportPresetHighestQuality)!
    exporter.videoComposition = videoComposition

    exporter.outputURL = outputURL
    exporter.outputFileType = AVFileTypeQuickTimeMovie

    exporter.exportAsynchronouslyWithCompletionHandler({ () -> Void in
        dispatch_async(dispatch_get_main_queue(), {
            self.handleExportCompletion(exporter)
        })
    })

推荐答案

解决了以下代码中的轮换:

Solved the rotation converting from the code below:

AVMutableVideoComposition旋转了以纵向模式捕获的视频

现在，如果有人知道，下面的导出问题就会出现: <罢工> https://stackoverflow.com/questions/35233766/avasset-failing-to-export

Now having issues with exporting in question below if anyone knows: https://stackoverflow.com/questions/35233766/avasset-failing-to-export

这篇关于iOS旋转视频AVA的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！