我正在使用以下方法从远程服务器URL生成视频缩略图。如果我的网址不是Firebase网址,例如。
https://sample-videos.com/video123/mp4/720/big_buck_bunny_720p_1mb.mp4
然后我可以生成缩略图,但是如果我的网址是firebase网址,如下所示
然后不生成视频缩略图。
获取视频缩略图的方法
func createThumbnailOfVideoFromRemoteUrl(url: String) -> UIImage? {
let asset = AVAsset(url: URL(string: url)!)
let assetImgGenerate = AVAssetImageGenerator(asset: asset)
assetImgGenerate.appliesPreferredTrackTransform = true
//Can set this to improve performance if target size is known before hand
//assetImgGenerate.maximumSize = CGSize(width,height)
let time = CMTimeMakeWithSeconds(1.0, 100)
do {
let img = try assetImgGenerate.copyCGImage(at: time, actualTime: nil)
let thumbnail = UIImage(cgImage: img)
return thumbnail
} catch {
print(error.localizedDescription)
return nil
}
}
请让我知道是什么问题?
答案 0 :(得分:2)
请尝试下面的代码为我工作。
func createThumbnailOfVideoFromRemoteUrl(url: String) {
if let asset = AVAsset(url: URL(string: url)!) as? AVAsset {
//let durationSeconds = CMTimeGetSeconds(asset.duration)
let generator = AVAssetImageGenerator(asset: asset)
generator.appliesPreferredTrackTransform = true
let time = CMTimeMakeWithSeconds(3.0, preferredTimescale: 600)
//var thumbnailImage: CGImage
generator.generateCGImagesAsynchronously(forTimes: [NSValue(time: time)]) { (time, thumbnail, cmtime, result, error) in
if (thumbnail != nil) {
DispatchQueue.main.async {
self.profileImgView.image = UIImage(cgImage: thumbnail!)
}
}
}
}
}
self.createThumbnailOfVideoFromRemoteUrl(url: "https://firebasestorage.googleapis.com/v0/b/shaberi-a249e.appspot.com/o/message-videos%2F8EDAC3FC-D754-4165-990A-97F6ECE120A6.mp4?alt=media&token=b3271370-a408-467d-abbc-7df2beef45c7")