AVPlayer播放m3u8流时如何捕捉图像？

Question

我用AVPlayer发挥m3u8文件，我想在这些代码来捕捉图像：

AVAssetImageGenerator *gen = [[AVAssetImageGenerator alloc] initWithAsset:self.player.currentItem.asset]; 
gen.appliesPreferredTrackTransform = YES; 
NSError *error = nil; 
CMTime actualTime; 
CMTime now = self.player.currentTime; 
[gen setRequestedTimeToleranceAfter:kCMTimeZero]; 
[gen setRequestedTimeToleranceBefore:kCMTimeZero]; 
CGImageRef image = [gen copyCGImageAtTime:now actualTime:&actualTime error:&error]; 
UIImage *thumb = [[UIImage alloc] initWithCGImage:image]; 
NSLog(@"%f , %f",CMTimeGetSeconds(now),CMTimeGetSeconds(actualTime)); 

NSLog(@"%@",error); 
if (image) { 
    CFRelease(image); 
} 

，但它不工作。错误是：

Error Domain=AVFoundationErrorDomain Code=-11800 "The operation could not be completed" UserInfo=0x7fadf25f59f0 {NSUnderlyingError=0x7fadf25f1670 "The operation couldn’t be completed. (OSStatus error -12782.)", NSLocalizedFailureReason=An unknown error occurred (-12782), NSLocalizedDescription=The operation could not be completed} 

我该如何解决它？
非常感谢。

Answer 1

AVAssetImageGenerator可能需要本地资产。也许你会有更多的运气在你的AVPlayer上添加一个AVPlayerItemVideoOutput，寻找所需的位置并在videoOutput上调用copyPixelBufferForItemTime:itemTimeForDisplay:。

Answer 2

我用下面的代码解决了同样的问题。

您可以使用此代码：

属性

@property (strong, nonatomic) AVPlayer *player; 
@property (strong, nonatomic) AVPlayerItem *playerItem; 
@property (strong, nonatomic) AVPlayerItemVideoOutput *videoOutput; 

初始

AVURLAsset *asset = [AVURLAsset URLAssetWithURL:url options:nil]; 
self.playerItem = [AVPlayerItem playerItemWithAsset:asset]; 
self.player = [AVPlayer playerWithPlayerItem:_playerItem]; 

入门图像

CMTime currentTime = _player.currentItem.currentTime; 
CVPixelBufferRef buffer = [_videoOutput copyPixelBufferForItemTime:currentTime itemTimeForDisplay:nil]; 
CIImage *ciImage = [CIImage imageWithCVPixelBuffer:buffer]; 
UIImage *image = [UIImage imageWithCIImage:ciImage]; 
//Use image^^