通过 NSURLSession 上传大视频导致内存压力崩溃 [英] Upload large video via NSURLSession causes memory pressure crash

问题描述

我使用以下代码将视频上传到服务器，这需要我将视频从视频格式转换为NSData.但是，当视频较大时(例如 10 分钟的视频)，App 会因内存压力而崩溃.我该如何解决这个问题?

I use the following codes to upload video to server, which requires me to convert the video from video format to NSData. However, when the video is large (e.g. 10 minute video), the App crashes due to memory pressure. How can I resolve this?

- (void)uploadVideo {
    NSDictionary *params = nil;
    NSString *NSURLSessionIdentifier = [NSString stringWithFormat:@"%@%@",@"my.bundle.identifier.",[self getTimeString]];
    NSURLSessionConfiguration *sessionConfig;
    // SessionConfiguration With iOS Version
    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0) {
        sessionConfig = [NSURLSessionConfiguration backgroundSessionConfigurationWithIdentifier:NSURLSessionIdentifier];
    } else {
        sessionConfig = [NSURLSessionConfiguration backgroundSessionConfiguration:NSURLSessionIdentifier];
    }
    sessionConfig.HTTPMaximumConnectionsPerHost = 1;

    NSURLSession *uploadSession = [NSURLSession sessionWithConfiguration:sessionConfig delegate:self delegateQueue:[NSOperationQueue new]];
    OMGMultipartFormData *multipartFormData = [OMGMultipartFormData new];

    NSString *url = @"SOME_UPLOAD_URL";
    // ========= PROBLEMATIC LINE below =========
    self.video_data = [NSData dataWithContentsOfURL:self.video_url];
    // ========= PROBLEMATIC LINE above =========
    [multipartFormData addFile:self.video_data parameterName:@"file" filename:@"file.mp4" contentType:@"video/mp4"];

    NSURLRequest *rq = [OMGHTTPURLRQ POST:url:multipartFormData];
    id path = [[NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"upload.NSData"];
    [rq.HTTPBody writeToFile:path atomically:YES];
    [[uploadSession uploadTaskWithRequest:rq fromFile:[NSURL fileURLWithPath:path]] resume];

}

附言self.video_url 是 UIImagePickerController 给出的文件 URL，它只过滤要选择的视频.然后我选择一个 10 分钟的视频.

p.s. self.video_url is a file URL given by UIImagePickerController which filters only video to choose. I then choose a 10-minute video.

附言我在同一个应用程序中也有 AFNetworking，它可以帮助后台传输吗?

p.s. I got AFNetworking in same App too, can it help with background transfer?

推荐答案

您应该能够通过使用 NSMutableURLRequest 并利用其 setHTTPBodyStream setter.

You should be able to this by using a NSMutableURLRequest and utilizing its setHTTPBodyStream setter.

以下是改编自我的一些代码的片段.它处理超过 10 分钟的视频方式.大部分是 60 到 90 分钟的大型视频.

The following are snippets adapted from some code of mine. It handled well for video way over 10 mins. mostly large videos of 60 - 90 minutes.

NSData *movieData = [NSData dataWithContentsOfFile:theMovieSourceString];

NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

[request setHTTPMethod:@"POST"];
[request setValue:@"video/quicktime" forHTTPHeaderField:@"Content-Type"];
[request setValue:[NSString stringWithFormat:@"attachment; filename=\"%@\"",yourMovieSourceString] forHTTPHeaderField:@"Content-Disposition"];
[request setValue:[NSString stringWithFormat:@"%ld",(unsigned long)[movieData length]] forHTTPHeaderField:@"Content-Length"];
[request setHTTPBodyStream:[NSInputStream inputStreamWithFileAtPath:yourMovieSourceString]];

您现在可以将此请求与您的 NSURLConnection

You can now use this request with your NSURLConnection

NSURLConnection *connection =[[NSURLConnection alloc] initWithRequest:request delegate:self];

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