UIImagePickController录制视频的旋转90度

调用系统的这个玩意竟然会有这个问题,真是不爽.

于是乎开始查资料:

-(void)useTheSystemRecordViewController{

UIImagePickerController * imagePicker = [[UIImagePickerController alloc] init];

imagePicker.delegate = self;

//判断是否可以拍摄

if ( [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {

//判断是否拥有拍摄权限

AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:AVMediaTypeVideo];

if(authStatus == AVAuthorizationStatusRestricted || authStatus == AVAuthorizationStatusDenied){

return;

}

//拍摄

imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;

//录制的类型 下面为视频

imagePicker.mediaTypes=@[(NSString*)kUTTypeMovie];

//录制的时长

imagePicker.videoMaximumDuration=10.0;

//模态视图的弹出效果

imagePicker.modalPresentationStyle=UIModalPresentationOverFullScreen;

[self presentViewController:imagePicker animated:YES completion:nil];

}

}

-(void)encodeVideoOrientation:(NSURL*)anOutputFileURL{

AVURLAsset * videoAsset = [[AVURLAsset alloc]initWithURL:anOutputFileURL options:nil];

AVAssetExportSession * assetExport = [[AVAssetExportSession alloc] initWithAsset:videoAsset

presetName:AVAssetExportPresetMediumQuality];

NSString* mp4Path = [NSHomeDirectory() stringByAppendingPathComponent:@"/Documents/Movie.mp4"];

assetExport.outputURL = [NSURL fileURLWithPath: mp4Path];

assetExport.shouldOptimizeForNetworkUse = YES;

assetExport.outputFileType = AVFileTypeMPEG4;

assetExport.videoComposition = [self getVideoComposition:videoAsset];

[assetExport exportAsynchronouslyWithCompletionHandler:^{

switch ([assetExport status]) {

case AVAssetExportSessionStatusFailed:

{

NSLog(@"AVAssetExportSessionStatusFailed!");

break;

}

case AVAssetExportSessionStatusCancelled:

NSLog(@"Export canceled");

break;

case AVAssetExportSessionStatusCompleted:

NSLog(@"Successful!");

break;

default:

break;

}

}];

}

#pragma mark - 解决录像保存角度问题

-(AVMutableVideoComposition *) getVideoComposition:(AVAsset *)asset

{

AVAssetTrack *videoTrack = [[asset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];

AVMutableComposition *composition = [AVMutableComposition composition];

AVMutableVideoComposition *videoComposition = [AVMutableVideoComposition videoComposition];

CGSize videoSize = videoTrack.naturalSize;

BOOL isPortrait_ = [self isVideoPortrait:asset];

if(isPortrait_) {

NSLog(@"video is portrait ");

videoSize = CGSizeMake(videoSize.height, videoSize.width);

}

composition.naturalSize    = videoSize;

videoComposition.renderSize = videoSize;

// videoComposition.renderSize = videoTrack.naturalSize; //

videoComposition.frameDuration = CMTimeMakeWithSeconds( 1 / videoTrack.nominalFrameRate, 600);

AVMutableCompositionTrack *compositionVideoTrack;

compositionVideoTrack = [composition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];

[compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, asset.duration) ofTrack:videoTrack atTime:kCMTimeZero error:nil];

AVMutableVideoCompositionLayerInstruction *layerInst;

layerInst = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:videoTrack];

[layerInst setTransform:videoTrack.preferredTransform atTime:kCMTimeZero];

AVMutableVideoCompositionInstruction *inst = [AVMutableVideoCompositionInstruction videoCompositionInstruction];

inst.timeRange = CMTimeRangeMake(kCMTimeZero, asset.duration);

inst.layerInstructions = [NSArray arrayWithObject:layerInst];

videoComposition.instructions = [NSArray arrayWithObject:inst];

return videoComposition;

}

-(BOOL) isVideoPortrait:(AVAsset *)asset

{

BOOL isPortrait = FALSE;

NSArray *tracks = [asset tracksWithMediaType:AVMediaTypeVideo];

if([tracks    count] > 0) {

AVAssetTrack *videoTrack = [tracks objectAtIndex:0];

CGAffineTransform t = videoTrack.preferredTransform;

// Portrait

if(t.a == 0 && t.b == 1.0 && t.c == -1.0 && t.d == 0)

{

isPortrait = YES;

}

// PortraitUpsideDown

if(t.a == 0 && t.b == -1.0 && t.c == 1.0 && t.d == 0)  {

isPortrait = YES;

}

// LandscapeRight

if(t.a == 1.0 && t.b == 0 && t.c == 0 && t.d == 1.0)

{

isPortrait = FALSE;

}

// LandscapeLeft

if(t.a == -1.0 && t.b == 0 && t.c == 0 && t.d == -1.0)

{

isPortrait = FALSE;

}

}

return isPortrait;

}

反正整个过程的逻辑大概就是判断视频方向,重新做一个压缩处理,转换成正确的方向.亲测可用!