Hello,I am trying to capture frames from a video and I'm currently using generateCGImagesAsynchronously(). The problem is that each frame is captured at 0.0s, 1.0s, 2.0s, 3.0s ... But I really want to capture it at 0.0s, 0.2s, 0.4s ...Here is my codeif let path = Bundle.main.path(forResource: "video", ofType:"MOV") {
let fileUrl = NSURL(fileURLWithPath: path)
let asset = AVURLAsset(url: (fileUrl as URL), options: nil)
let videoDuration = asset.duration
let generator = AVAssetImageGenerator(asset: asset)
var frameForTimes = [NSValue]()
let sampleCounts = 20
let totalTimeLength = Int(videoDuration.seconds * Double(videoDuration.timescale))
let step = totalTimeLength / sampleCounts
for i in 0 ..< sampleCounts {
let cmTime = CMTimeMake(Int64(i * step), Int32(videoDuration.timescale))
frameForTimes.append(NSValue(time: cmTime))
}
generator.generateCGImagesAsynchronously(forTimes: frameForTimes, completionHandler: {requestedTime, image, actualTime, result, error in
DispatchQueue.main.async {
if let image = image {
print(requestedTime.value, requestedTime.seconds, actualTime.value)
self.frames.append(UIImage(cgImage: image))
}
}
})
}The timescale is 600 and actualTime.value is always at 0, 601, 1202, 1802 ... It seems that it is only taking frames at an integer seconds (0, 1, 2, 3 ...)Is there a way to capture frames at non-integer seconds using generateCGImagesAsynchronously()? For example: 0.2s, 0.4s?Or should I look into other APIs?Thank you,Jass
