想要在AVPlayer中播放視頻時逐幀提取所有圖像

Question

在AVPlayer中播放視頻時，逐幀提取所有圖像。

例如，如果視頻速度爲30 fps，視頻持續時間爲10秒，那麼我應該可以從視頻中獲得300幅圖像。使用此代碼

目前我提取圖像：

[self.player addPeriodicTimeObserverForInterval：CMTimeMake（1，fps）的隊列：dispatch_get_main_queue（）usingBlock：

^(CMTime time) { 
    [weakSelf readNextMovieFrame]; 
}]; 
(void) readNextMovieFrame { 

CMTime outputItemTime = [[self playerItem] currentTime]; 

CMTime t = [[self playerItem] currentTime]; 
CMTime d = [[self playerItem] duration]; 

if ([_output hasNewPixelBufferForItemTime:outputItemTime]) { 
    CVPixelBufferRef buffer = [_output copyPixelBufferForItemTime:outputItemTime itemTimeForDisplay:nil]; 

    CIImage *image = [CIImage imageWithCVPixelBuffer:buffer]; 

    UIImage *imageUI = [self makeUIImageFromCIImage:image]; 

    [self saveImage]; 

    //CFRelease(sampleBuffer); 
    CVBufferRelease(buffer); 

} 

}

Answer 1

我使用以下是從iOS上的視頻中提取圖像。

- (UIImage *)getVideoImageAtTime:(CMTime)time player:(AVPlayer *)player { 
    NSError *error = nil; 
    AVAsset *asset = player.currentItem.asset; 
    AVAssetImageGenerator *ig = [[AVAssetImageGenerator alloc] initWithAsset:asset]; 
    CGImageRef image = [ig copyCGImageAtTime:time actualTime:nil error:&error]; 
    UIImage *screenShot = [UIImage imageWithCGImage:image]; 
    CGImageRelease(image); 
    return error ? screenShot : nil; 
}