我试图从视频URL中获取缩略图。该视频是使用m3u8格式的流(HLS)。 我已经尝试了MPMoviePlayerController的requestThumbnailImagesAtTimes,但没有成功。有人有解决这个问题的方案吗?如果有,你是如何做到的?
我试图从视频URL中获取缩略图。该视频是使用m3u8格式的流(HLS)。 我已经尝试了MPMoviePlayerController的requestThumbnailImagesAtTimes,但没有成功。有人有解决这个问题的方案吗?如果有,你是如何做到的?
如果您不想使用MPMoviePlayerController
,可以这样做:
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 的一个示例:
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,并且您可以同时实例化多个。
NSString *strVideoURL = @"http://www.xyzvideourl.com/samplevideourl";
NSURL *videoURL = [NSURL URLWithString:strVideoURL] ;
MPMoviePlayerController *player = [[[MPMoviePlayerController alloc] initWithContentURL:videoURL]autorelease];
UIImage *thumbnail = [player thumbnailImageAtTime:1.0 timeOption:MPMovieTimeOptionNearestKeyFrame];
player = nil;
用strVideoURL
替换您的视频URL字符串。
您将从video
获得缩略图作为输出。
缩略图是UIImage
类型的数据!
将视频的URL字符串替换为strVideoURL
,然后从video
获取缩略图作为输出。缩略图是UIImage
类型的数据!
-(UIImage *)loadThumbNail:(NSURL *)urlVideo
{
AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:urlVideo options:nil];
AVAssetImageGenerator *generate = [[AVAssetImageGenerator alloc] initWithAsset:asset];
generate.appliesPreferredTrackTransform=TRUE;
NSError *err = NULL;
CMTime time = CMTimeMake(1, 60);
CGImageRef imgRef = [generate copyCGImageAtTime:time actualTime:NULL error:&err];
NSLog(@"err==%@, imageRef==%@", err, imgRef);
return [[UIImage alloc] initWithCGImage:imgRef];
}
AVFoundation
框架,不要忘记导入<AVFoundation/AVFoundation.h>
,您需要将文档目录中保存视频的路径作为参数传递,并接收图像作为UIImage
。你可以使用下面的代码从视频url中获取缩略图
MPMoviePlayerController *player = [[[MPMoviePlayerController alloc] initWithContentURL:videoURL]autorelease];
UIImage *thumbnail = [player thumbnailImageAtTime:0.0 timeOption:MPMovieTimeOptionNearestKeyFrame];
对于 Swift 5,您可以按照以下方式获取:
首先,在 ViewController
中导入 AVKit 或 AVFoundation
import AVKit
代码:
// Get Thumbnail Image from URL
private func getThumbnailFromUrl(_ url: String?, _ completion: @escaping ((_ image: UIImage?)->Void)) {
guard let url = URL(string: url ?? "") else { return }
DispatchQueue.main.async {
let asset = AVAsset(url: url)
let assetImgGenerate = AVAssetImageGenerator(asset: asset)
assetImgGenerate.appliesPreferredTrackTransform = true
let time = CMTimeMake(value: 2, timescale: 1)
do {
let img = try assetImgGenerate.copyCGImage(at: time, actualTime: nil)
let thumbnail = UIImage(cgImage: img)
completion(thumbnail)
} catch {
print("Error :: ", error.localizedDescription)
completion(nil)
}
}
}
用法
@IBOutlet weak imgThumbnail: ImageView!
然后调用 getThumbnailFromUrl
方法,并将 URL
作为 String
参数传递。
self.getThumbnailFromUrl(videoURL) { [weak self] (img) in
guard let `self` = self else { return }
if let img = img {
self.imgThumbnail.image = img
}
}
谢谢您
对于Swift 3.0:
func generateThumbnailForVideoAtURL(filePathLocal: NSString) -> UIImage? {
let vidURL = NSURL(fileURLWithPath:filePathLocal as String)
let asset = AVURLAsset(url: vidURL as URL)
let generator = AVAssetImageGenerator(asset: asset)
generator.appliesPreferredTrackTransform = true
let timestamp = CMTime(seconds: 1, preferredTimescale: 60)
do {
let imageRef = try generator.copyCGImage(at: timestamp, actualTime: nil)
let frameImg : UIImage = UIImage(cgImage: imageRef)
return frameImg
} catch let error as NSError {
print("Image generation failed with error ::\(error)")
return nil
}
}
Swift 3 版本:
func createThumbnailOfVideoFromFileURL(videoURL: String) -> UIImage? {
let asset = AVAsset(url: URL(string: videoURL)!)
let assetImgGenerate = AVAssetImageGenerator(asset: asset)
assetImgGenerate.appliesPreferredTrackTransform = true
let time = CMTimeMakeWithSeconds(Float64(1), 100)
do {
let img = try assetImgGenerate.copyCGImage(at: time, actualTime: nil)
let thumbnail = UIImage(cgImage: img)
return thumbnail
} catch {
// Set a default image if Image is not acquired
return UIImage(named: "ico_placeholder")
}
}
使用AVAssetImageGenerator的Swift 2代码:
func thumbnailImageForVideo(url:NSURL) -> UIImage?
{
let asset = AVAsset(URL: url)
let imageGenerator = AVAssetImageGenerator(asset: asset)
imageGenerator.appliesPreferredTrackTransform = true
var time = asset.duration
//If possible - take not the first frame (it could be completely black or white on camara's videos)
time.value = min(time.value, 2)
do {
let imageRef = try imageGenerator.copyCGImageAtTime(time, actualTime: nil)
return UIImage(CGImage: imageRef)
}
catch let error as NSError
{
print("Image generation failed with error \(error)")
return nil
}
}