将mp4视频保存到设备相机胶卷 [英] save mp4 video to device camera roll

问题描述

我首先只是一个NSString，这是一个.mp4文件的网址，从这里我希望将该视频保存到设备相机胶卷。我似乎只能保存.mov文件，所以我必须首先转换.mp4，但是我看到的关于这个的几个帖子没有帮助。

I'm starting with just an NSString that is a url to an .mp4 file, and from here I would like to have that video saved to the device camera roll. It seems I can only save .mov files, so I have to first convert the .mp4, but the few posts I've seen about this didn't help.

任何人都可以帮我解决这个问题吗？

Can anyone help me accomplish this?

提前致谢...

推荐答案

您可以将mp4文件保存到相机胶卷中，前提是它使用支持的编解码器。例如：

You can save an mp4 file to the camera roll provided it uses supported codecs. For example:

NSURL *sourceURL = [NSURL URLWithString:@"http://path/to/video.mp4"];

NSURLSessionTask *download = [[NSURLSession sharedSession] downloadTaskWithURL:sourceURL completionHandler:^(NSURL *location, NSURLResponse *response, NSError *error) {
    NSURL *documentsURL = [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] firstObject];
    NSURL *tempURL = [documentsURL URLByAppendingPathComponent:[sourceURL lastPathComponent]];
    [[NSFileManager defaultManager] moveItemAtURL:location toURL:tempURL error:nil];
    UISaveVideoAtPathToSavedPhotosAlbum(tempURL.path, nil, NULL, NULL);
}];

[download resume];

或者，在iOS 6及以上版本中：

Or, on iOS 6 and above:

NSURL *sourceURL = [NSURL URLWithString:@"http://path/to/video.mp4"];
NSURLRequest *request = [NSURLRequest requestWithURL:sourceURL];

[NSURLConnection sendAsynchronousRequest:request queue:[NSOperationQueue mainQueue] completionHandler:^(NSURLResponse *response, NSData *data, NSError *connectionError) {
    NSURL *documentsURL = [[[NSFileManager defaultManager] URLsForDirectory:NSDocumentDirectory inDomains:NSUserDomainMask] firstObject];
    NSURL *tempURL = [documentsURL URLByAppendingPathComponent:[sourceURL lastPathComponent]];
    [data writeToURL:tempURL atomically:YES];
    UISaveVideoAtPathToSavedPhotosAlbum(tempURL.path, nil, NULL, NULL);
}];

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