Pause & resume video capture using AVCaptureMovieFileOutput and AVCaptureVideoDataOutput in iOS - iphone

Question

I have to implement functionality to repeatedly pause and resume video capture in a single session, but have each new segment (the captured segments after each pause) added to the same video file, with AVFoundation. Currently, every time I press "stop" then "record" again, it just saves a new video file to my iPhone's Document directory and starts capturing to a new file. I need to be able to press the "record/stop" button over, only capture video & audio when record is active... then when the "done" button is pressed, have a single AV file with all the segments together. And all this needs to happen in the same capture session / preview session.
I am not using AVAssetWriterInput.
The only way I can think of to try this is when the "done" button is pressed, taking each individual output file and combining them together into a single file.
This code is working for iOS 5 but not for iOS 6. Actually for iOS 6, the first time when I pause recording (stop recording) AVCaptureFileOutputRecordingDelegate method (captureOutput: didFinishRecordingToOutputFileAtURL: fromConnections: error:) is called but after that when I start the recording the delegate method (captureOutput: didFinishRecordingToOutputFileAtURL: fromConnections: error:) is called again but it is not called at the time of stop recording.
I need a solution for that issue. Please help me.
//View LifeCycle
- (void)viewDidLoad
{
[super viewDidLoad];
self.finalRecordedVideoName = [self stringWithNewUUID];
arrVideoName = [[NSMutableArray alloc]initWithCapacity:0];
arrOutputUrl = [[NSMutableArray alloc] initWithCapacity:0];
CaptureSession = [[AVCaptureSession alloc] init];
captureDevices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
if ([captureDevices count] > 0)
{
NSError *error;
VideoInputDevice = [[AVCaptureDeviceInput alloc] initWithDevice:[self backFacingCamera] error:&error];
if (!error)
{
if ([CaptureSession canAddInput:VideoInputDevice])
[CaptureSession addInput:VideoInputDevice];
else
NSLog(#"Couldn't add video input");
}
else
{
NSLog(#"Couldn't create video input");
}
}
else
{
NSLog(#"Couldn't create video capture device");
}
//ADD VIDEO PREVIEW LAYER
NSLog(#"Adding video preview layer");
AVCaptureVideoPreviewLayer *layer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:CaptureSession];
[self setPreviewLayer:layer];
UIDeviceOrientation currentOrientation = [UIDevice currentDevice].orientation;
NSLog(#"%d",currentOrientation);
if (currentOrientation == UIDeviceOrientationPortrait)
{
PreviewLayer.orientation = AVCaptureVideoOrientationPortrait;
}
else if (currentOrientation == UIDeviceOrientationPortraitUpsideDown)
{
PreviewLayer.orientation = AVCaptureVideoOrientationPortraitUpsideDown;
}
else if (currentOrientation == UIDeviceOrientationLandscapeRight)
{
PreviewLayer.orientation = AVCaptureVideoOrientationLandscapeRight;
}
else if (currentOrientation == UIDeviceOrientationLandscapeLeft)
{
PreviewLayer.orientation = AVCaptureVideoOrientationLandscapeLeft;
}
[[self PreviewLayer] setVideoGravity:AVLayerVideoGravityResizeAspectFill];
//ADD MOVIE FILE OUTPUT
NSLog(#"Adding movie file output");
MovieFileOutput = [[AVCaptureMovieFileOutput alloc] init];
VideoDataOutput = [[AVCaptureVideoDataOutput alloc] init];
[VideoDataOutput setSampleBufferDelegate:self queue:dispatch_get_main_queue()];
NSString* key = (NSString*)kCVPixelBufferBytesPerRowAlignmentKey;
NSNumber* value = [NSNumber numberWithUnsignedInt:kCVPixelFormatType_32BGRA];
NSDictionary* videoSettings = [NSDictionary dictionaryWithObject:value forKey:key];
[VideoDataOutput setVideoSettings:videoSettings];
Float64 TotalSeconds = 60; //Total seconds
int32_t preferredTimeScale = 30; //Frames per second
CMTime maxDuration = CMTimeMakeWithSeconds(TotalSeconds, preferredTimeScale);//<<SET MAX DURATION
MovieFileOutput.maxRecordedDuration = maxDuration;
MovieFileOutput.minFreeDiskSpaceLimit = 1024 * 1024; //<<SET MIN FREE SPACE IN BYTES FOR RECORDING TO CONTINUE ON A VOLUME
//SET THE CONNECTION PROPERTIES (output properties)
[self CameraSetOutputProperties]; //(We call a method as it also has to be done after changing camera)
AVCaptureConnection *videoConnection = nil;
for ( AVCaptureConnection *connection in [MovieFileOutput connections] )
{
NSLog(#"%#", connection);
for ( AVCaptureInputPort *port in [connection inputPorts] )
{
NSLog(#"%#", port);
if ( [[port mediaType] isEqual:AVMediaTypeVideo] )
{
videoConnection = connection;
}
}
}
if([videoConnection isVideoOrientationSupported]) // **Here it is, its always false**
{
[videoConnection setVideoOrientation:[[UIDevice currentDevice] orientation]];
} NSLog(#"Setting image quality");
[CaptureSession setSessionPreset:AVCaptureSessionPresetLow];
//----- DISPLAY THE PREVIEW LAYER -----
CGRect layerRect = CGRectMake(5, 5, 299, ([[UIScreen mainScreen] bounds].size.height == 568)?438:348);
[self.PreviewLayer setBounds:layerRect];
[self.PreviewLayer setPosition:CGPointMake(CGRectGetMidX(layerRect),CGRectGetMidY(layerRect))];
if ([CaptureSession canAddOutput:MovieFileOutput])
[CaptureSession addOutput:MovieFileOutput];
[CaptureSession addOutput:VideoDataOutput];
//We use this instead so it goes on a layer behind our UI controls (avoids us having to manually bring each control to the front):
CameraView = [[UIView alloc] init];
[videoPreviewLayer addSubview:CameraView];
[videoPreviewLayer sendSubviewToBack:CameraView];
[[CameraView layer] addSublayer:PreviewLayer];
//----- START THE CAPTURE SESSION RUNNING -----
[CaptureSession startRunning];
}
#pragma mark - IBACtion Methods
-(IBAction)btnStartAndStopPressed:(id)sender
{
UIButton *StartAndStopButton = (UIButton*)sender;
if ([StartAndStopButton isSelected] == NO)
{
[StartAndStopButton setSelected:YES];
[btnPauseAndResume setEnabled:YES];
[btnBack setEnabled:NO];
[btnSwitchCameraInput setHidden:YES];
NSDate *date = [NSDate date];
NSLog(#" date %#",date);
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *recordedFileName = nil;
recordedFileName = [NSString stringWithFormat:#"output%#.mov",date];
NSString *documentsDirectory = [paths objectAtIndex:0];
self.outputPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:#"%#",recordedFileName]];
NSLog(#"%#",self.outputPath);
[arrVideoName addObject:recordedFileName];
NSURL *outputURL = [[NSURL alloc] initFileURLWithPath:self.outputPath];
if ([[NSFileManager defaultManager] fileExistsAtPath:self.outputPath])
{
NSError *error;
if ([[NSFileManager defaultManager] removeItemAtPath:self.outputPath error:&error] == NO)
{
//Error - handle if requried
}
}
//Start recording
[MovieFileOutput startRecordingToOutputFileURL:outputURL recordingDelegate:self];
recordingTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:#selector(VideoRecording) userInfo:nil repeats:YES];
}
else
{
[StartAndStopButton setSelected:NO];
[btnPauseAndResume setEnabled:NO];
[btnBack setEnabled:YES];
[btnSwitchCameraInput setHidden:NO];
NSLog(#"STOP RECORDING");
WeAreRecording = NO;
[MovieFileOutput stopRecording];
[((ActOutAppDelegate *)ActOut_AppDelegate) showLoadingViewOnView:self.view withLabel:#"Please wait...."];
if ([recordingTimer isValid])
{
[recordingTimer invalidate];
recordingTimer = nil;
recordingTime = 30;
}
stopRecording = YES;
}
}
- (IBAction)btnPauseAndResumePressed:(id)sender
{
UIButton *PauseAndResumeButton = (UIButton*)sender;
if (PauseAndResumeButton.selected == NO)
{
PauseAndResumeButton.selected = YES;
NSLog(#"recording paused");
WeAreRecording = NO;
[MovieFileOutput stopRecording];
[self pauseTimer:recordingTimer];
[btnStartAndStop setEnabled:NO];
[btnBack setEnabled:YES];
[btnSwitchCameraInput setHidden:NO];
}
else
{
PauseAndResumeButton.selected = NO;
NSLog(#"recording resumed");
[btnStartAndStop setEnabled:YES];
[btnBack setEnabled:NO];
[btnSwitchCameraInput setHidden:YES];
WeAreRecording = YES;
NSDate *date = [NSDate date];
NSLog(#" date %#",date);
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask, YES);
NSString *recordedFileName = nil;
recordedFileName = [NSString stringWithFormat:#"output%#.mov",date];
NSString *documentsDirectory = [paths objectAtIndex:0];
self.outputPath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:#"%#",recordedFileName]];
NSLog(#"%#",self.outputPath);
[arrVideoName addObject:recordedFileName];
NSURL *outputURL = [[NSURL alloc] initFileURLWithPath:self.outputPath];
if ([[NSFileManager defaultManager] fileExistsAtPath:self.outputPath])
{
NSError *error;
if ([[NSFileManager defaultManager] removeItemAtPath:self.outputPath error:&error] == NO)
{
//Error - handle if requried
}
}
[self resumeTimer:recordingTimer];
//Start recording
[MovieFileOutput startRecordingToOutputFileURL:outputURL recordingDelegate:self];
}
}
- (void) CameraSetOutputProperties
{
//SET THE CONNECTION PROPERTIES (output properties)
AVCaptureConnection *CaptureConnection = [MovieFileOutput connectionWithMediaType:AVMediaTypeVideo];
[CaptureConnection setVideoOrientation:AVCaptureVideoOrientationPortrait];
//Set frame rate (if requried)
CMTimeShow(CaptureConnection.videoMinFrameDuration);
CMTimeShow(CaptureConnection.videoMaxFrameDuration);
if (CaptureConnection.supportsVideoMinFrameDuration)
CaptureConnection.videoMinFrameDuration = CMTimeMake(1, CAPTURE_FRAMES_PER_SECOND);
if (CaptureConnection.supportsVideoMaxFrameDuration)
CaptureConnection.videoMaxFrameDuration = CMTimeMake(1, CAPTURE_FRAMES_PER_SECOND);
CMTimeShow(CaptureConnection.videoMinFrameDuration);
CMTimeShow(CaptureConnection.videoMaxFrameDuration);
}
- (AVCaptureDevice *) CameraWithPosition:(AVCaptureDevicePosition) Position
{
NSArray *Devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
for (AVCaptureDevice *Device in Devices)
{
if ([Device position] == Position)
{
NSLog(#"%d",Position);
return Device;
}
}
return nil;
}
#pragma mark - AVCaptureFileOutputRecordingDelegate Method
-(void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection
{
if(videoWriterInput.readyForMoreMediaData && WeAreRecording) [videoWriterInput appendSampleBuffer:sampleBuffer];
for(AVCaptureConnection *captureConnection in [captureOutput connections])
{
if ([captureConnection isVideoOrientationSupported])
{
AVCaptureVideoOrientation orientation = AVCaptureVideoOrientationLandscapeLeft;
[captureConnection setVideoOrientation:orientation];
}
}
UIDeviceOrientation curOr = [[UIDevice currentDevice] orientation];
CGAffineTransform t;
if (curOr == UIDeviceOrientationPortrait)
{
t = CGAffineTransformMakeRotation(-M_PI / 2);
}
else if (curOr == UIDeviceOrientationPortraitUpsideDown)
{
t = CGAffineTransformMakeRotation(M_PI / 2);
}
else if (curOr == UIDeviceOrientationLandscapeRight)
{
t = CGAffineTransformMakeRotation(M_PI);
}
else
{
t = CGAffineTransformMakeRotation(0);
}
}
- (void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error
{
NSLog(#"didFinishRecordingToOutputFileAtURL - enter");
NSLog(#"output file url : %#", [outputFileURL absoluteString]);
BOOL RecordedSuccessfully = YES;
if ([error code] != noErr)
{
// A problem occurred: Find out if the recording was successful.
id value = [[error userInfo] objectForKey:AVErrorRecordingSuccessfullyFinishedKey];
if (value)
{
RecordedSuccessfully = [value boolValue];
}
}
AVCaptureConnection *videoConnection=nil;
for ( AVCaptureConnection *connection in [MovieFileOutput connections] )
{
NSLog(#"%#", connection);
for ( AVCaptureInputPort *port in [connection inputPorts] )
{
NSLog(#"%#", port);
if ( [[port mediaType] isEqual:AVMediaTypeVideo] )
{
videoConnection = connection;
}
}
}
if([videoConnection isVideoOrientationSupported]) // **Here it is, its always false**
{
[videoConnection setVideoOrientation:[[UIDevice currentDevice] orientation]];
} NSLog(#"Setting image quality");
NSData *videoData = [NSData dataWithContentsOfURL:outputFileURL];
[videoData writeToFile:self.outputPath atomically:NO];
[arrOutputUrl addObject:outputFileURL];
if (stopRecording)
{
[self mergeMultipleVideo];
}
}
//Method to merge multiple audios
-(void)mergeMultipleVideo
{
mixComposition = [AVMutableComposition composition];
AVMutableCompositionTrack *compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
CMTime nextClipStartTime = kCMTimeZero;
NSLog(#"Array of output file url : %#", arrOutputUrl);
if (arrOutputUrl.count > 0)
{
for(int i = 0 ;i < [arrOutputUrl count];i++)
{
AVURLAsset* VideoAsset = [[AVURLAsset alloc]initWithURL:[arrOutputUrl objectAtIndex:i] options:nil];
CMTimeRange timeRangeInAsset;
timeRangeInAsset = CMTimeRangeMake(kCMTimeZero, [VideoAsset duration]);
[compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, VideoAsset.duration) ofTrack:[[VideoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] atTime:nextClipStartTime error:nil];
nextClipStartTime = CMTimeAdd(nextClipStartTime, timeRangeInAsset.duration);
}
}
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *myPathDocs = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:#"%#.mov",self.finalRecordedVideoName]];
NSURL *url = [NSURL fileURLWithPath:myPathDocs];
AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetHighestQuality];
exportSession.outputURL=url;
exportSession.outputFileType = AVFileTypeQuickTimeMovie;
exportSession.shouldOptimizeForNetworkUse = YES;
[exportSession exportAsynchronouslyWithCompletionHandler:^{
dispatch_async(dispatch_get_main_queue(), ^{
[self exportDidFinish:exportSession path:myPathDocs];
});
}];
}
-(void)exportDidFinish:(AVAssetExportSession*)session path:(NSString*)outputVideoPath
{
NSLog(#"session.status : %d",session.status);
if (session.status == AVAssetExportSessionStatusCompleted)
{
NSURL *outputURL = session.outputURL;
NSData *videoData = [NSData dataWithContentsOfURL:outputURL];
[videoData writeToFile:outputVideoPath atomically:NO];
if ([arrVideoName count] > 0)
{
for (int i = 0; i < [arrVideoName count]; i++)
{
NSArray* documentPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString* fullFilePath = [[documentPaths objectAtIndex:0] stringByAppendingPathComponent: [NSString stringWithFormat:#"%#",[arrVideoName objectAtIndex:i]]];
NSLog(#"Full path of file to be deleted: %#",fullFilePath);
NSFileManager *fileManager = [NSFileManager defaultManager];
NSError *error;
if ([fileManager fileExistsAtPath:fullFilePath])
{
[fileManager removeItemAtPath:fullFilePath error:&error];
}
}
[arrVideoName removeAllObjects];
}
if (arrOutputUrl.count > 0)
{
[arrOutputUrl removeAllObjects];
}
[((ActOutAppDelegate *)ActOut_AppDelegate) removeLoadingViewfromView:self.view];
[self.view addSubview:afterRecordingPopupView];
}
}

Answer 1

Look at the AVCaptureConnection's enabled property. For your output connection, set enabled to NO instead of stopping the session.