如何从视频中获取最后一帧？ [英] How to get last frame from video?

问题描述

我想要最后一帧视频，我的代码如下所示：

I want last frame of video and my code is shown below:

let asset : AVURLAsset = AVURLAsset(URL: videoURL, options: nil)
    let generate : AVAssetImageGenerator = AVAssetImageGenerator(asset: asset)
    generate.appliesPreferredTrackTransform = true

    var err : NSError? = nil
    var lastFrameTime = Int64(CMTimeGetSeconds(asset.duration))
    let time : CMTime = CMTimeMake(lastFrameTime, 30)
    let imgRef : CGImageRef = generate.copyCGImageAtTime(time, actualTime: nil, error: &err)
    let img : UIImage = UIImage(CGImage: imgRef)!

但我没有得到最后一帧，我得到第一帧，为我提供解决方案。

But I am not getting last frame , I am getting first frame, provide me solution for this.

推荐答案

我已经解决了这个问题，只能从代码中获取视频的最后一帧：

I have solved this , to get only last frame from video the code is following:

  let asset : AVURLAsset = AVURLAsset(URL: videoURL, options: nil)
    let generate : AVAssetImageGenerator = AVAssetImageGenerator(asset: asset)
    generate.appliesPreferredTrackTransform = true

    var err : NSError? = nil
    var lastFrameTime = Int64(CMTimeGetSeconds(asset.duration)*60.0)
    let time : CMTime = CMTimeMake(lastFrameTime, 2)
    let imgRef : CGImageRef = generate.copyCGImageAtTime(time, actualTime: nil, error: &err)
    let img : UIImage = UIImage(CGImage: imgRef)!

这就是我在img变量中获取最后一段视频的方式。

This is how I get last image of video in img variable.

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