我想用 1:1 纵横比的 iOS 相机拍摄视频。
我试过了UIImagePickerController
,但它不提供改变纵横比。谁能给我一些想法?
此外,iPhone 应用程序“Viddy”提供 1:1 纵横比视频捕捉:
我想用 1:1 纵横比的 iOS 相机拍摄视频。
我试过了UIImagePickerController
,但它不提供改变纵横比。谁能给我一些想法?
此外,iPhone 应用程序“Viddy”提供 1:1 纵横比视频捕捉:
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];
笔记:
_preview 的 videoGravity 和 videoSettings AVVideoScalingModeKey 应该相同才能获得 320 x 320 的输出。
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];
}];
在哪里
asset
是输入电影文件。cropRegion
是要裁剪的区域。movieUrl
是保存裁剪后的电影的目标 url。我认为没有某些应用程序的帮助是不可能做到这一点的,或者即使有一个应用程序可以做到,您也可以捕获视频然后将其裁剪为 1:1