AVPlayerLayer ottiene Immagine a UIImageView Buffer

Question

provo a [playerLayer renderInContext: UIGraphicsGetCurrentContext()]; mostrerà lo sfondo nero. quindi ottengo continuamente la voce di un giocatore come immagine thump in modo che non assomigli al video, ma solo alle immagini fisse che scorrono continuamente. quindi qualsiasi altra opzione da fare?

Answer 1

provare questo codice per il lettore di configurazione

//setUp Reader 
    AVURLAsset * asset = [AVURLAsset URLAssetWithURL:urlvalue options:nil]; 
    [asset loadValuesAsynchronouslyForKeys:[NSArray arrayWithObject:@"tracks"] completionHandler: ^{ dispatch_async(dispatch_get_main_queue(), ^{ 
     AVAssetTrack * videoTrack = nil; 
     NSArray * tracks = [asset tracksWithMediaType:AVMediaTypeVideo]; 
     if ([tracks count] == 1) { 
      videoTrack = [tracks objectAtIndex:0]; 
      NSError * error = nil; 
      _movieReader = [[AVAssetReader alloc] initWithAsset:asset error:&error]; 
      if (error) 
       NSLog(error.localizedDescription); 
      NSString* key = (NSString*)kCVPixelBufferPixelFormatTypeKey; 
      NSNumber* value = [NSNumber numberWithUnsignedInt:kCVPixelFormatType_4444AYpCbCr16]; NSDictionary* videoSettings = [NSDictionary dictionaryWithObject:value forKey:key]; 
      [_movieReader addOutput:[AVAssetReaderTrackOutput assetReaderTrackOutputWithTrack:videoTrack outputSettings:videoSettings]]; 
      [_movieReader startReading]; 

     } 
    }); 
    }]; 

per ottenere fotogramma successivo film

- (void) readNextMovieFrame { 

    if (_movieReader.status == AVAssetReaderStatusReading) { 

     AVAssetReaderTrackOutput * output = [_movieReader.outputs objectAtIndex:0]; 
     CMSampleBufferRef sampleBuffer = [output copyNextSampleBuffer]; 
     if (sampleBuffer) { 
      CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer); 
      // Lock the image buffer 
      CVPixelBufferLockBaseAddress(imageBuffer,0); 
      // Get information of the image 
      uint8_t *baseAddress = (uint8_t *)CVPixelBufferGetBaseAddress(imageBuffer); 
      size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer); 
      size_t width = CVPixelBufferGetWidth(imageBuffer); 
      size_t height = CVPixelBufferGetHeight(imageBuffer); 

      /*We unlock the image buffer*/ 
      CVPixelBufferUnlockBaseAddress(imageBuffer,0); 

      /*Create a CGImageRef from the CVImageBufferRef*/ 
      CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); 
      CGContextRef newContext = CGBitmapContextCreate(baseAddress, width, height, 8, bytesPerRow, colorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst); 
      CGImageRef newImage = CGBitmapContextCreateImage(newContext); 

      /*We release some components*/ 
      CGContextRelease(newContext); 
      CGColorSpaceRelease(colorSpace); 

      /*We display the result on the custom layer*/ 
      /*self.customLayer.contents = (id) newImage;*/ 

      /*We display the result on the image view (We need to change the orientation of the image so that the video is displayed correctly)*/ 
      UIImage *image= [UIImage imageWithCGImage:newImage scale:0.0 orientation:UIImageOrientationRight]; 
      UIGraphicsBeginImageContext(image.size); 

      [image drawAtPoint:CGPointMake(0, 0)]; 

      // UIImage *img=UIGraphicsGetImageFromCurrentImageContext(); 
      videoImage=UIGraphicsGetImageFromCurrentImageContext(); 

      UIGraphicsEndImageContext(); 


//videoImage=image; 

      // if (frameCount < 40) { 
       NSLog(@"readNextMovieFrame==%d",frameCount); 
         NSString* filename = [NSString stringWithFormat:@"Documents/frame_%d.png", frameCount]; 
         NSString* pngPath = [NSHomeDirectory() stringByAppendingPathComponent:filename]; 
        [UIImagePNGRepresentation(videoImage) writeToFile: pngPath atomically: YES]; 
        frameCount++; 
     //  } 

      CVPixelBufferUnlockBaseAddress(imageBuffer,0); 
      CFRelease(sampleBuffer); 
     } 
    } 
}