直接从相机胶卷播放视频，是否可能？

Question

我在这个问题上运行了几天。我需要从相机胶卷中选择一个视频并直接在我的应用中播放。我想知道的只是：它有可能吗？因为我的代码在我从相机胶卷中挑选后没有播放视频，我怀疑在播放之前我可能需要将视频保存在本地。

我的相关代码如下：

//...
if (CFStringCompare((CFStringRef)mediaType, kUTTypeMovie, 0)==kCFCompareEqualTo) {
    NSString *moviePath=[[info objectForKey:UIImagePickerControllerMediaURL]path];
    NSURL *movieURL=[NSURL URLWithString:moviePath];
    self.mpController=[[MPMoviePlayerController alloc]initWithContentURL:movieURL];

    NSLog(@"%@",moviePath);
    [[NSNotificationCenter defaultCenter]addObserver:self
                                            selector:@selector(moviePlayBackDidFinish:)
                                                name:MPMoviePlayerPlaybackDidFinishNotification
                                              object:self.mpController];

    self.mpController.movieSourceType=MPMovieSourceTypeStreaming;
    self.mpController.controlStyle=MPMediaTypeMusicVideo;
    [self.mpController prepareToPlay];
    [self.mpController.view setFrame:self.view.bounds];
    [self.mpController setFullscreen:YES animated:YES];
    [self.view addSubview:self.mpController.view];
    [self.mpController play];


}
[[picker presentingViewController] dismissViewControllerAnimated:YES completion:NULL];

//...

-(void)moviePlayBackDidFinish:(NSNotification*)notification{
    NSLog(@"moviePlayBAckDidFinish");
    MPMoviePlayerController *player = [notification object];
    [[NSNotificationCenter defaultCenter]
     removeObserver:self
     name:MPMoviePlayerPlaybackDidFinishNotification
     object:player];

    if ([player
         respondsToSelector:@selector(setFullscreen:animated:)])
    {
        player.fullscreen=NO;
        [player.view removeFromSuperview];
    }
}

P.S ：压缩视频后，通知处理程序moviePlayBackDidFinish总是被调用，我得到一个空白屏幕。此外，记录moviePath变量给了我这样的路径：

/private/var/mobile/Applications/5912AED1-S1DE-25EF-A8B-EF7AD21E3R65/tmp//trim.‌​uUcGJU.MOV

正如我所说，我认为我怀疑直接从相机胶卷播放视频是不可能的。但我需要你确认一下。感谢名单。