问题描述
我正在尝试从视频网址获取缩略图.视频是 m3u8 格式的流 (HLS).我已经尝试过 MPMoviePlayerController 中的 requestThumbnailImagesAtTimes,但是没有用.有没有人有解决这个问题的方法?如果是这样,你是怎么做的?
I am trying to acquire a thumbnail from a video url. The video is a stream (HLS) with the m3u8 format.I've already tried requestThumbnailImagesAtTimes from the MPMoviePlayerController, but that didn't work. Does anyone have a solution for that problem? If so how'd you do it?
推荐答案
如果不想使用MPMoviePlayerController
,可以这样做:
If you don't want to use MPMoviePlayerController
, you can do this:
AVAsset *asset = [AVAsset assetWithURL:sourceURL];
AVAssetImageGenerator *imageGenerator = [[AVAssetImageGenerator alloc]initWithAsset:asset];
CMTime time = CMTimeMake(1, 1);
CGImageRef imageRef = [imageGenerator copyCGImageAtTime:time actualTime:NULL error:NULL];
UIImage *thumbnail = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef); // CGImageRef won't be released by ARC
以下是 Swift 中的示例:
Here's an example in Swift:
func thumbnail(sourceURL sourceURL:NSURL) -> UIImage {
let asset = AVAsset(URL: sourceURL)
let imageGenerator = AVAssetImageGenerator(asset: asset)
let time = CMTime(seconds: 1, preferredTimescale: 1)
do {
let imageRef = try imageGenerator.copyCGImageAtTime(time, actualTime: nil)
return UIImage(CGImage: imageRef)
} catch {
print(error)
return UIImage(named: "some generic thumbnail")!
}
}
我更喜欢使用 AVAssetImageGenerator
而不是 MPMoviePlayerController
,因为它是线程安全的,并且您可以一次实例化多个.
I prefer using AVAssetImageGenerator
over MPMoviePlayerController
because it is thread-safe, and you can have more than one instantiated at a time.
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