获取视频大小Byte

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照相机用 UIImagePickerController ，以后拍摄一段录像。我点击了使用视频，该视频保存到图片库。现在我想要这段视频的大小。我用 AlAssetLibrary 将视频保存到图片库。如何可以获取大小的视频只是采取了？请帮助我。先谢谢了。

    -(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info{    ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];    NSURL *recordedVideoURL= [info objectForKey:UIImagePickerControllerMediaURL];    if ([library videoAtPathIsCompatibleWithSavedPhotosAlbum:recordedVideoURL]) {        [library writeVideoAtPathToSavedPhotosAlbum:recordedVideoURL                                    completionBlock:^(NSURL *assetURL, NSError *error){}         ];    }}

我试过以下代码来获取视频但不是作品的大小：

 ALAssetRepresentation *rep = [alasset defaultRepresentation];Byte *buffer = (Byte*)malloc(rep.size);NSError *error = nil;NSUInteger buffered = [rep getBytes:buffer fromOffset:0.0 length:rep.size error:&error];NSData *data = [NSData dataWithBytesNoCopy:buffer length:buffered freeWhenDone:YES];

解决方法 1:

你可以通过三种方式

1.使用NSData length

    ALAssetRepresentation *rep = [alasset defaultRepresentation];    Byte *buffer = (Byte*)malloc(rep.size);    NSError *error = nil;    NSUInteger buffered = [rep getBytes:buffer fromOffset:0.0 length:rep.size error:&error];    NSData *data = [NSData dataWithBytesNoCopy:buffer length:buffered freeWhenDone:YES];    NSLog(@"Size of video %d",data.length);

2.利用ALAssetRepresentationsize

3.最坏的情况：使用 videoPathURL 指向已保存的视频文件，检索它再次使用 ALAsset 和 caliculate 的大小。

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