我有一个要求:在播放视频流(m3u8)之前获取帧图像,作为视频预览显示.我使用AVPlayerItemVideoOutpu copyPixelBufferForItemTime:itemTimeForDisplay:只有在播放视频流才能获得帧图像时,您还有其他方法吗?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.这是新的回购
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`
}
原始答案:
正如你在问题中所述,AVPlayerItemVideoOutput是要走的路,但是,视频不需要播放,它只需要“准备好”.
我创建了一个简单易用的实用程序,遵循此原则从远程流中提取缩略图.
(https://github.com/acotilla91/ACThumbnailGenerator)
如何使用:
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`
}];
希望能帮助到你.