Question

我想用iOS相机以1：1的宽高比捕捉视频。

我尝试使用UIImagePickerController，但它没有提供更改的宽高比。任何人都可以给我一些想法吗？

此外，iPhone应用程序“Viddy”提供1：1宽高比视频捕捉 http://gyazo.com/1ccba9990bb589961f1d5df23b71b84b.png?1364791668

谢谢！

Answer 1

AVCaptureVideoPreviewLayer *_preview = [AVVideoCaptureVideoPreviewLayer layerWithSession:_session];

_preview.frame = CGRectMake(0,0,320,320);
_preview.videoGravity = AVLayerVideoGravityResizeAspectFill;



NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:
                               AVVideoCodecH264, AVVideoCodecKey,
                               [NSNumber numberWithInt:320], AVVideoWidthKey,
                               [NSNumber numberWithInt:320], AVVideoHeightKey,
                               AVVideoScalingModeResizeAspectFill,AVVideoScalingModeKey,
                               nil];

self.videoInput = [AVAssetWriterInput assetWriterInputWithMediaType: AVMediaTypeVideo
                                                     outputSettings: videoSettings];


self.videoInput.transform = CGAffineTransformMakeRotation(M_PI);
if([_writer canAddInput:_videoInput]) // AVAssetWriter *_writer
    [_writer addInput:_videoInput];

注意：

_preview的videoGravity和videoSettings AVVideoScalingModeKey应相同，以使输出为320 x 320.

Answer 2

 GPUImageMovie* movieFile = [[GPUImageMovie alloc] initWithAsset:asset];
    GPUImageCropFilter *cropFilter = [[GPUImageCropFilter alloc] initWithCropRegion:CGRectMake(0.0, 0.1, 1.0, 0.8)];

    [movieFile addTarget:cropFilter];
    GPUImageMovieWriter* movieWriter = [[GPUImageMovieWriter alloc] initWithMovieURL:movieURL size:CGSizeMake(320.0, 320.0)];

    [cropFilter addTarget:movieWriter];
    [movieWriter startRecording];
    [movieFile startProcessing]; 
    [movieWriter finishRecordingWithCompletionHandler:^{

               NSLog(@"Completed Successfully");
               [cropFilter removeTarget:movieWriter];
               [movieFile removeTarget:cropFilter];
    }];

<强>，其中

asset是输入电影文件。
cropRegion是要裁剪的区域。
movieUrl是保存已裁剪影片的目标网址。

Answer 3

我不认为没有某些应用程序的帮助就可以这样做，或者即使可以使用应用程序，您也可以捕获视频，然后将其裁剪为1：1

在iOS中以1：1的宽高比进行视频捕获

3 个答案: