AVPlayer播放m3u8流时如何捕捉图像?
问题描述:
我用AVPlayer
发挥m3u8
文件,我想在这些代码来捕捉图像:AVPlayer播放m3u8流时如何捕捉图像?
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。
答
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:
。
答
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^^
你怎么初始化videoOutput? – AntonijoDev 2017-08-21 10:00:24