我有一个需求:在播放视频流(m3u8)之前获取帧图像,作为视频预览显示。我用AVPlayerItemVideoOutpu copyPixelBufferForItemTime: itemTimeForDisplay: 只在播放视频流的时候用到帧图,请问有其他方法吗?谢谢!!
这是我的代码:
CMTime itemTime = self.playerItem.currentTime;
CVPixelBufferRef pixelBuffer = [_playerItemVideoOutput copyPixelBufferForItemTime:itemTime itemTimeForDisplay:nil];
CIImage *ciImage = [CIImage imageWithCVPixelBuffer:pixelBuffer];
CIContext *temporaryContext = [CIContext contextWithOptions:nil];
CGImageRef videoImage = [temporaryContext
createCGImage:ciImage
fromRect:CGRectMake(0, 0,
CVPixelBufferGetWidth(pixelBuffer),
CVPixelBufferGetHeight(pixelBuffer))];
UIImage *uiImage = [UIImage imageWithCGImage:videoImage];
CGImageRelease(videoImage);
NSLog(@"uiImage:%@", uiImage);
最佳答案
编辑:
我已将此项目转换为 Swift。这是新的 repo ACThumbnailGenerator-Swift .
用法:
var generator: ACThumbnailGenerator!
func captureSomeImage() {
let streamUrl = URL(string: "https://p-events-delivery.akamaized.net/18oijbasfvuhbfsdvoijhbsdfvljkb6/m3u8/hls_vod_mvp.m3u8")!
generator = ACThumbnailGenerator(streamUrl: streamUrl)
generator.delegate = self
generator.captureImage(at: 300)
}
func generator(_ generator: ACThumbnailGenerator, didCapture image: UIImage, at position: Double) {
// Use `image`
}
原答案:
正如您在问题中所述,AVPlayerItemVideoOutput
是可行的方法,但是,视频不需要播放,只需要“准备好”。
我创建了一个简单易用的实用程序,它遵循这一原则从远程流中提取缩略图。 ( https://github.com/acotilla91/ACThumbnailGenerator )
使用方法:
double bitRate = 1000000; // force video bit rate (can be use to cap video quality and improve performance). Pass 0 to use default bit rate.
self.thumbnailGenerator = [[ACThumbnailGenerator alloc] initWithPreferredBitRate:bitRate];
NSURL *videoURL = [NSURL URLWithString:@"http://qthttp.apple.com.edgesuite.net/1010qwoeiuryfg/sl.m3u8"];
int position = 10; // video position (in seconds) from where thumbnail should be extracted. Always pass 0 for live streams.
[self.thumbnailGenerator loadImageFrom:videoURL position:position withCompletionBlock:^(UIImage *image) {
// use `image`
}];
希望对您有所帮助。
关于ios - 如何在播放 m3u8 视频流之前获取帧图像? iOS,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/36904084/