iOS Menentukan Jumlah Frame dalam Video

Saya rasa MPMoviePlayerController tidak dapat membantu Anda.

Gunakan AVAssetReader dan hitung jumlah CMSampleBuffer yang dikembalikan kepada Anda. Anda dapat mengonfigurasinya bahkan untuk tidak mendekode bingkai, menguraikan file secara efektif, sehingga harus cepat dan hemat memori.

Sesuatu seperti

    var asset = AVURLAsset(URL: url, options: nil)
    var reader = AVAssetReader(asset: asset, error: nil)
    var videoTrack = asset.tracksWithMediaType(AVMediaTypeVideo)[0] as! AVAssetTrack

    var readerOutput = AVAssetReaderTrackOutput(track: videoTrack, outputSettings: nil) // NB: nil, should give you raw frames
    reader.addOutput(readerOutput)
    reader.startReading()

    var nFrames = 0

    while true {
        var sampleBuffer = readerOutput.copyNextSampleBuffer()
        if sampleBuffer == nil {
            break
        }

        nFrames++
    }

    println("Num frames: \(nFrames)")

Maaf jika itu tidak idiomatis, saya tidak tahu Swift.

Cepat 5

 func getNumberOfFrames(url: URL) -> Int {
        let asset = AVURLAsset(url: url, options: nil)
        do {
            let reader = try AVAssetReader(asset: asset)
        //AVAssetReader(asset: asset, error: nil)
            let videoTrack = asset.tracks(withMediaType: AVMediaType.video)[0]

            let readerOutput = AVAssetReaderTrackOutput(track: videoTrack, outputSettings: nil) // NB: nil, should give you raw frames
            reader.add(readerOutput)
        reader.startReading()

        var nFrames = 0

        while true {
            let sampleBuffer = readerOutput.copyNextSampleBuffer()
            if sampleBuffer == nil {
                break
            }

            nFrames = nFrames+1
        }

        print("Num frames: \(nFrames)")
            return nFrames
        }catch {
            print("Error: \(error)")
        }
        return 0
    }

Anda juga bisa menggunakan frame per detik untuk menghitung total frame.

var player: AVPlayer?
var playerController = AVPlayerViewController()
var videoFPS: Int = 0
var totalFrames: Int?


guard let videoURL = "" else { return }
player = AVPlayer(url: videoURL)
playerController.player = player
guard player?.currentItem?.asset != nil else {
    return
}
let asset = self.player?.currentItem?.asset
let tracks = asset!.tracks(withMediaType: .video)
let fps = tracks.first?.nominalFrameRate
let duration = self.player?.currentItem?.duration

self.videoFPS = lround(Double(fps!))
self.totalFrames = lround(Double(self!.videoFPS) * durationSeconds)