Question

我正在尝试实现以下功能

最终录制的视频 =“从前置摄像头捕获视频 + 录制视频中的音频（我正在播放视频播放器）“。

有关更多说明，请参阅附加屏幕截图。

enter image description here

使用下面给出的我的代码块：最后我得到的是一段视频，但没有音频。

但我想要实现的是“最终录制视频必须组合：'从我的前置摄像头捕获的视频< / strong> + 仅录制我正在播放的视频文件中的音频。'“

如何实现上述功能？

这是我的代码。

“录制”按钮单击方法如下：

-(void) startRecording { [self initCaptureSession]; NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"video" ofType:@"mp4"]]; [self playMovieAtURL:url]; [self startVideoRecording]; }

“ initCaptureSession ”：使用此方法我正在使用前置摄像头录制视频 “AVCaptureSession”

-(void) initCaptureSession { NSLog(@"Setting up capture session"); captureSession = [[AVCaptureSession alloc] init]; NSLog(@"Adding video input"); AVCaptureDevice *VideoDevice = [self frontFacingCameraIfAvailable]; if (VideoDevice) { NSError *error; videoInputDevice = [AVCaptureDeviceInput deviceInputWithDevice:VideoDevice 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"); } NSLog(@"Adding audio input"); AVCaptureDevice *audioCaptureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeMuxed]; NSError *error = nil; AVCaptureDeviceInput *audioInput = [AVCaptureDeviceInput deviceInputWithDevice:audioCaptureDevice error:&error]; if (audioInput) { [captureSession addInput:audioInput]; } NSLog(@"Adding movie file output"); movieFileOutput = [[AVCaptureMovieFileOutput alloc] init]; movieFileOutput.minFreeDiskSpaceLimit = 1024 * 1024; //<<SET MIN FREE SPACE IN BYTES FOR RECORDING TO CONTINUE ON A VOLUME if ([captureSession canAddOutput:movieFileOutput]) [captureSession addOutput:movieFileOutput]; [self CameraSetOutputProperties]; //(We call a method as it also has to be done after changing camera) NSLog(@"Setting image quality"); [captureSession setSessionPreset:AVCaptureSessionPresetMedium]; if ([captureSession canSetSessionPreset:AVCaptureSessionPreset640x480]) //Check size based configs are supported before setting them [captureSession setSessionPreset:AVCaptureSessionPreset640x480]; [captureSession startRunning]; } - (void) CameraSetOutputProperties { AVCaptureConnection *CaptureConnection = nil; NSComparisonResult order = [[UIDevice currentDevice].systemVersion compare: @"5.0.0" options: NSNumericSearch]; if (order == NSOrderedSame || order == NSOrderedDescending) { // OS version >= 5.0.0 CaptureConnection = [movieFileOutput connectionWithMediaType:AVMediaTypeVideo]; } else { // OS version < 5.0.0 CaptureConnection = [self connectionWithMediaType:AVMediaTypeVideo fromConnections:[movieFileOutput connections]]; } //Set landscape (if required) if ([CaptureConnection isVideoOrientationSupported]) { AVCaptureVideoOrientation orientation = AVCaptureVideoOrientationPortrait;// AVCaptureVideoOrientationLandscapeRight; //<<<<<SET VIDEO ORIENTATION IF LANDSCAPE [CaptureConnection setVideoOrientation:orientation]; } }

“ - （void）playMovieAtURL：（NSURL *）theURL ”通过使用此方法我正在播放视频

-(void) playMovieAtURL: (NSURL*) theURL { player = [[MPMoviePlayerController alloc] initWithContentURL: theURL]; [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayAndRecord error:nil]; player.scalingMode = MPMovieScalingModeAspectFill; player.controlStyle = MPMovieControlStyleNone; [player prepareToPlay]; [[NSNotificationCenter defaultCenter] addObserver: self selector: @selector(myMovieFinishedCallback:) name: MPMoviePlayerPlaybackDidFinishNotification object: player]; player.view.frame=CGRectMake(10, 30, 300, 200); [self.view addSubview:player.view]; [player play]; }

“ startVideoRecording ”使用此方法我已开始录制最终视频。

- (void) startVideoRecording { //Create temporary URL to record to NSString *outputPath = [[NSString alloc] initWithFormat:@"%@%@", NSTemporaryDirectory(), @"output.mov"]; NSURL *outputURL = [[NSURL alloc] initFileURLWithPath:outputPath]; NSFileManager *fileManager = [NSFileManager defaultManager]; if ([fileManager fileExistsAtPath:outputPath]) { NSError *error; if ([fileManager removeItemAtPath:outputPath error:&error] == NO) { //Error - handle if required NSLog(@"file remove error"); } } //Start recording [movieFileOutput startRecordingToOutputFileURL:outputURL recordingDelegate:self]; } - (void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error { NSLog(@"didFinishRecordingToOutputFileAtURL - enter"); 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]; } } if (RecordedSuccessfully) { //----- RECORDED SUCCESSFULLY ----- NSLog(@"didFinishRecordingToOutputFileAtURL - success"); ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init]; if ([library videoAtPathIsCompatibleWithSavedPhotosAlbum:outputFileURL]) { [library writeVideoAtPathToSavedPhotosAlbum:outputFileURL completionBlock:^(NSURL *assetURL, NSError *error) { if (error) { NSLog(@"File save error"); } else { recordedVideoURL=assetURL; } }]; } else { NSString *assetURL=[self copyFileToDocuments:outputFileURL]; if(assetURL!=nil) { recordedVideoURL=[NSURL URLWithString:assetURL]; } } } }

Answer 1

//为以下方法添加一些额外代码“第一方法”

  -(void) playMovieAtURL: (NSURL*) theURL

    {
       [player play];
       AVAudioSession *audioSession = [AVAudioSession sharedInstance];
       NSError *err = nil;
       [audioSession setCategory :AVAudioSessionCategoryPlayAndRecord error:&err];
     if(err)
      {
        NSLog(@"audioSession: %@ %d %@", [err domain], [err code], [[err userInfo]     description]);
        return;
    }
       [audioSession setActive:YES error:&err];
       err = nil;
    if(err){
        NSLog(@"audioSession: %@ %d %@", [err domain], [err code], [[err userInfo] description]);
        return;
    }

       recordSetting = [[NSMutableDictionary alloc] init];

      [recordSetting setValue :[NSNumber numberWithInt:kAudioFormatAppleIMA4] forKey:AVFormatIDKey];
      [recordSetting setValue:[NSNumber numberWithFloat:16000.0] forKey:AVSampleRateKey];
      [recordSetting setValue:[NSNumber numberWithInt: 1] forKey:AVNumberOfChannelsKey];
      recorderFilePath = [NSString stringWithFormat:@"%@/MySound.caf", DOCUMENTS_FOLDER];
     NSLog(@"recorderFilePath: %@",recorderFilePath);
     audio_url = [NSURL fileURLWithPath:recorderFilePath];
    err = nil;
    NSData *audioData = [NSData dataWithContentsOfFile:[audio_url path] options: 0 error:&err];
    if(audioData)
    {
        NSFileManager *fm = [NSFileManager defaultManager];
        [fm removeItemAtPath:[audio_url path] error:&err];
    }

    err = nil;
    recorder = [[ AVAudioRecorder alloc] initWithURL:audio_url settings:recordSetting error:&err];
    if(!recorder)
    {
        NSLog(@"recorder: %@ %d %@", [err domain], [err code], [[err userInfo] description]);
        UIAlertView *alert =
        [[UIAlertView alloc] initWithTitle: @"Warning"
                                   message: [err localizedDescription]
                                  delegate: nil
                         cancelButtonTitle:@"OK"
                         otherButtonTitles:nil];
        [alert show];
        return;
    }

    //prepare to record
    [recorder setDelegate:self];
    [recorder prepareToRecord];
    recorder.meteringEnabled = YES;

    BOOL audioHWAvailable = audioSession.inputAvailable;
    if (! audioHWAvailable)
    {
        UIAlertView *cantRecordAlert =
        [[UIAlertView alloc] initWithTitle: @"Warning"
                                   message: @"Audio input hardware not available"
                                  delegate: nil
                         cancelButtonTitle:@"OK"
                         otherButtonTitles:nil];
        [cantRecordAlert show];
        return;
    }


}

//第二种方法

-(void) stopVideoRecording

    {
    [player.view removeFromSuperview];
    [player stop];
    [movieFileOutput stopRecording];

    AVURLAsset* audioAsset = [[AVURLAsset alloc]initWithURL:audio_url options:nil];
    AVURLAsset* videoAsset = [[AVURLAsset alloc]initWithURL:outputURL options:nil];

    mixComposition = [AVMutableComposition composition];

    AVMutableCompositionTrack *compositionCommentaryTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio
                                                                                        preferredTrackID:kCMPersistentTrackID_Invalid];
    [compositionCommentaryTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, audioAsset.duration)
                                        ofTrack:[[audioAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0]
                                         atTime:kCMTimeZero error:nil];

    AVMutableCompositionTrack *compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo
                                                                                   preferredTrackID:kCMPersistentTrackID_Invalid];
    [compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration)
                                   ofTrack:[[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0]
                                    atTime:kCMTimeZero error:nil];

    AVAssetExportSession* _assetExport = [[AVAssetExportSession alloc] initWithAsset:mixComposition
                                                                          presetName:AVAssetExportPresetPassthrough];

    AVAssetTrack *videoTrack = [[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
    [compositionVideoTrack setPreferredTransform:videoTrack.preferredTransform];
}

//最终播放视频

AVPlayerItem *playerItem = [AVPlayerItem playerItemWithAsset:mixComposition];
AVPlayer *player1 = [AVPlayer playerWithPlayerItem:playerItem];
AVPlayerLayer *playerLayer = [AVPlayerLayer playerLayerWithPlayer:player1];
[playerLayer setFrame:CGRectMake(0, 0, 320, 480)];
[[[self view] layer] addSublayer:playerLayer];
playerLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
[player1 play];
player1.actionAtItemEnd = AVPlayerActionAtItemEndNone;

Answer 2

我认为这可能对你有帮助..

AVURLAsset* audioAsset = [[AVURLAsset alloc]initWithURL:audioUrl options:nil];
AVURLAsset* videoAsset = [[AVURLAsset alloc]initWithURL:videoUrl options:nil];

AVMutableComposition* mixComposition = [AVMutableComposition composition];

AVMutableCompositionTrack *compositionCommentaryTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio 
                                                                                    preferredTrackID:kCMPersistentTrackID_Invalid];
[compositionCommentaryTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, audioAsset.duration) 
                                    ofTrack:[[audioAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0] 
                                     atTime:kCMTimeZero error:nil];

AVMutableCompositionTrack *compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo 
                                                                                    preferredTrackID:kCMPersistentTrackID_Invalid];
[compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration) 
                               ofTrack:[[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] 
                                atTime:kCMTimeZero error:nil];

AVAssetExportSession* _assetExport = [[AVAssetExportSession alloc] initWithAsset:mixComposition 
                                                                      presetName:AVAssetExportPresetPassthrough];   

NSString* videoName = @"export.mov";

NSString *exportPath = [NSTemporaryDirectory() stringByAppendingPathComponent:videoName];
NSURL    *exportUrl = [NSURL fileURLWithPath:exportPath];

if ([[NSFileManager defaultManager] fileExistsAtPath:exportPath]) 
{
    [[NSFileManager defaultManager] removeItemAtPath:exportPath error:nil];
}

_assetExport.outputFileType = @"com.apple.quicktime-movie";
DLog(@"file type %@",_assetExport.outputFileType);
_assetExport.outputURL = exportUrl;
_assetExport.shouldOptimizeForNetworkUse = YES;

[_assetExport exportAsynchronouslyWithCompletionHandler:
 ^(void ) {      
            // your completion code here
     }       
 }
 ];

提供者： - https://stackoverflow.com/a/3456565/1865424

您还可以检查从前置摄像头录制视频的代码。

-(IBAction)cameraLibraryButtonClick:(id)sender{
    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {              
        UIImagePickerController *videoRecorder = [[UIImagePickerController alloc]init];  
        videoRecorder.delegate = self;
        NSArray *sourceTypes = [UIImagePickerController availableMediaTypesForSourceType:videoRecorder.sourceType];
        NSLog(@"Available types for source as camera = %@", sourceTypes);
        if (![sourceTypes containsObject:(NSString*)kUTTypeMovie] ) {
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil 
                                                            message:@"Device Not Supported for video Recording."                                                                       delegate:self 
                                                  cancelButtonTitle:@"Yes" 
                                                  otherButtonTitles:@"No",nil];
            [alert show];
            [alert release];
            return;
        }
        videoRecorder.cameraDevice=UIImagePickerControllerCameraDeviceFront;
        videoRecorder.sourceType = UIImagePickerControllerSourceTypeCamera;
        videoRecorder.mediaTypes = [NSArray arrayWithObject:(NSString*)kUTTypeMovie];           
        videoRecorder.videoQuality = UIImagePickerControllerQualityTypeLow;
        videoRecorder.videoMaximumDuration = 120;

        self.imagePicker = videoRecorder;                 
        [videoRecorder release];
        [self presentModalViewController:self.imagePicker animated:YES];
        newMedia = YES;
    }
    else {
        [self displaysorceError];
    }


}

提供者： - https://stackoverflow.com/a/14154289/1865424

如果这些对你不起作用..让我知道。但我认为这会帮助你..

以编程方式在iOS中录制视频

2 个答案: