我正在尝试实现如下功能
最终录制的视频=“从前置摄像头捕获视频+从视频中录制音频（我正在通过视频播放器播放）”。
如需更多了解，请参阅附件屏幕截图。
使用下面给出的代码块：最后我得到的是一个视频，但没有音频。
但我想尝试实现的是“最终录制的视频必须是以下组合：'从我的前置摄像头捕获的视频+仅从我正在播放的视频文件中录制音频。'”
如何实现上述功能？
这是我的代码。
“录音”按钮点击方法如下：
-(void) startRecording
{
[self initCaptureSession];
NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle]
pathForResource:@"video"
ofType:@"mp4"]];
[self playMovieAtURL:url];
[self startVideoRecording];
}
“ initCaptureSession ”：使用这种方法，我正在使用前置摄像头使用“AVCaptureSession”录制视频
-(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 ” 通过使用这种方法，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 ” 使用这种方法我已经开始录制最终视频。
- (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];
}
}
}
}