获取视频缩略图

根据视频资源的路径获取视频的缩略图

+(UIImage *)getThumbnailImage:(NSString *)videoPath {
if (videoPath) {
AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:[NSURL fileURLWithPath: videoPath] options:nil];
AVAssetImageGenerator *gen = [[AVAssetImageGenerator alloc] initWithAsset:asset];
// 设定缩略图的方向
// 如果不设定，可能会在视频旋转90/180/270°时，获取到的缩略图是被旋转过的，而不是正向的
gen.appliesPreferredTrackTransform = YES;
// 设置图片的最大size(分辨率)
gen.maximumSize = CGSizeMake(300, 169);
CMTime time = CMTimeMakeWithSeconds(5.0, 600); //取第5秒，一秒钟600帧
NSError *error = nil;
CMTime actualTime;
CGImageRef image = [gen copyCGImageAtTime:time actualTime:&actualTime error:&error];
if (error) {
UIImage *placeHoldImg = [UIImage imageNamed:@"posters_default_horizontal"];
return placeHoldImg;
}
UIImage *thumb = [[UIImage alloc] initWithCGImage:image];
CGImageRelease(image);
return thumb;
} else {
UIImage *placeHoldImg = [UIImage imageNamed:@"posters_default_horizontal"];
return placeHoldImg;
}
}

// 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);
  return videoImage;
  }