Swift Get Video Frame 使用 AVFoundation [英] Swift Get Video Frame use AVFoundation
本文介绍了Swift Get Video Frame 使用 AVFoundation的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
这是我的代码:我想获取我的视频并将帧数据获取到 SceneKit SCNSphere.
This is my code: I want get my video and get the frame data to an SceneKit SCNSphere.
//NSString videoPath=NSBundle.mainBundle().l
var videoURL=NSBundle.mainBundle().URLForResource("video", withExtension: "mp4")
var assetOptions = [AVURLAssetPreferPreciseDurationAndTimingKey : 1]
videoAsset=AVURLAsset(URL: videoURL, options: assetOptions)
var error:NSError?
var videoAssetReader=AVAssetReader(asset: videoAsset, error: &error)
//var duration = CMTimeGetSeconds(videoAsset.duration)
//println(videoAsset.duration)
// println(duration)
if error != nil
{
println(error)
}
var tracksArray=videoAsset?.tracksWithMediaType(AVMediaTypeVideo)
var audio=videoAsset?.tracksWithMediaType(AVMediaTypeAudio)
println(tracksArray?)
var videotrack = tracksArray?[0] as AVAssetTrack
//println(videotrack?.size)
fps = videotrack.nominalFrameRate
var videoSetting = [kCVPixelBufferPixelFormatTypeKey : kCVPixelFormatType_32RGBA]
var videoTrackOutput=AVAssetReaderTrackOutput(track:videotrack as AVAssetTrack , outputSettings:videoSetting)
// videoTrackOutput.outputSettings=
if videoAssetReader.canAddOutput(videoTrackOutput)
{
println(videoTrackOutput)
videoAssetReader.addOutput(videoTrackOutput)
videoAssetReader.startReading()
}
var image=GeneralPreview()
var uiImage=UIImage(CGImage: image)
if videoAssetReader.status == AVAssetReaderStatus.Reading{
var sampleBuffer = videoTrackOutput.copyNextSampleBuffer()
println(sampleBuffer)
//var imageData: NSData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(sampleBuffer?)
//var image: UIImage = UIImage(data: imageData)
}
我刚从 oc 学到这个.在我的代码中,我无法获取最后一个对象 sampleBuffer 它是 nil !我不知道为什么?我只是想知道我的mathod是否正确?希望得到帮助!
I just learn this from oc. In my code, I can not get the last object sampleBuffer It is nil ! I dnot know why? I just want to know if my mathod is right? hope for help!
推荐答案
尝试将 kCVPixelFormatType_32RGBA 更改为 kCVPixelFormatType_32BGRA.这就是我的诀窍.
Try changing kCVPixelFormatType_32RGBA to kCVPixelFormatType_32BGRA. That's what did the trick for me.
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