获取视频第一张

/ 获取视频第一帧

• (UIImage*) getVideoPreViewImage:(NSURL *)path
  {
  AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:path options:nil];
  AVAssetImageGenerator *assetGen = [[AVAssetImageGenerator alloc] initWithAsset:asset];

  assetGen.appliesPreferredTrackTransform = YES;
  CMTime time = CMTimeMakeWithSeconds(0.0, 600);
  NSError *error = nil;
  CMTime actualTime;
  CGImageRef image = [assetGen copyCGImageAtTime:time actualTime:&actualTime error:&error];
  UIImage *videoImage = [[UIImage alloc] initWithCGImage:image];
  CGImageRelease(image);
  r