压缩iOS AVSession视频

Question

压缩iOS AVSession视频

iosvideoparse-platformavfoundation

3

我正在使用LLSimpleCamera在我的应用中捕获视频：

https://github.com/omergul123/LLSimpleCamera

它的效果很好！我很喜欢它，但是我也在使用Parse作为后端，最大文件大小为10MB。这应该不是问题，因为我捕获的AVSession视频都少于10秒，所以不应该那么大。

是否有一种压缩视频的方法，或者LLSimple相机中是否有一些我没有看到的东西会导致视频如此之大。

例如，我的4秒视频导致PFFile大于10 MB，如10.6 MB！

以下是我使用LLSimpleCamera库上传的代码：

- (void)uploadMessage {
NSData *fileData;
NSString *fileName;
NSString *fileType;

fileData = [NSData dataWithContentsOfURL:self.videoUrl];
fileName = @"video.mov";
fileType = @"video";

NSLog(@"filesize = %@",[NSByteCountFormatter stringFromByteCount:fileData.length countStyle:NSByteCountFormatterCountStyleFile]);

float fileSize = (float)fileData.length;
NSLog(@"filesize = %f", fileSize);



if(fileSize <= 10485760) {

    PFFile *file = [PFFile fileWithName:fileName data:fileData];
    [file saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
        if (error) {
            UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"An error occurred!"
                                                                message:@"Please try sending your message again."
                                                               delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
            [alertView show];
        }
        else {
            PFObject *message = [PFObject objectWithClassName:@"Scenes"];
            [message setObject:file forKey:@"file"];
            [message setObject:fileType forKey:@"fileType"];
            [message setObject:[[PFUser currentUser] objectId] forKey:@"userId"];
            [message setObject:[[PFUser currentUser] username] forKey:@"userName"];
            [message setObject:[[PFUser currentUser] objectForKey:@"loggedInVenueId"] forKey:@"venueId"];
            [message saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
                if (error) {
                    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"An error occurred!"
                                                                        message:@"Please try sending your message again."
                                                                       delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
                    [alertView show];
                }
                else {
                    // Everything was successful!

                }
            }];
        }
    }];

}else
{
    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Video too big!"
                                                        message:@"Please try sending your message again."
                                                       delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [alertView show];
}




[self.navigationController popViewControllerAnimated:YES];

}

- ian

1个回答

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原文链接

- Mo Nazemi · Accepted Answer

我以前写过自己的摄像头库，我的应用程序将长视频文件上传到Parse，所有视频文件都在10 MB以下。确保您的视频文件不超过10 MB的诀窍是控制影响视频文件大小的两个主要因素，即录制质量和分辨率。

通过设置录制输入会话属性（由苹果文档记录）的AVCaptureSession，很容易控制这两个主要因素。

NSString *const AVCaptureSessionPresetPhoto;
NSString *const AVCaptureSessionPresetHigh;
NSString *const AVCaptureSessionPresetMedium;
NSString *const AVCaptureSessionPresetLow;
NSString *const AVCaptureSessionPreset320x240;
NSString *const AVCaptureSessionPreset352x288;
NSString *const AVCaptureSessionPreset640x480;
NSString *const AVCaptureSessionPreset960x540;
NSString *const AVCaptureSessionPreset1280x720;
NSString *const AVCaptureSessionPresetiFrame960x540;
NSString *const AVCaptureSessionPresetiFrame1280x720;

我认为您的4秒视频，大小超过10MB，是以AVCaptureSessionPresetHigh为会话预设录制的全高清视频。当您初始化LLSimpleCamera库时，最好选择一个较低的预设，例如:

[[LLSimpleCamera alloc] initWithQuality:AVCaptureSessionPresetMedium
                                         position:CameraPositionBack
                                     videoEnabled:YES];