视频录制在iphone sdk中 [英] Video recording in iphone sdk programatically
本文介绍了视频录制在iphone sdk中的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
$ <$> =从前置摄像头捕获视频 + 录制来自视频的音频（通过视频播放器播放的 ）。请参阅附件屏幕截图。
使用我的代码块，如下所示：最后我得到的是视频，但没有音频。 >
但我想尝试实现的是最终录制视频，必须是组合：' A从我的前置摄像头捕获的视频 + 只记录正在播放的视频文件的音频。
帮助或指导我如何实现上述功能。
录制 按钮单击方法如下：
- （void）startRecording
{self binclude} ;
NSURL * url = [NSURL fileURLWithPath：[[NSBundle mainBundle]
pathForResource：@video
ofType：@mp4]];
[self playMovieAtURL：url];
[self startVideoRecording];
}
initCaptureSession ：使用此方法使用前置摄像头使用
AVCaptureSession录制视频
- （void）initCaptureSession
{
NSLog（@设置捕获会话）;
captureSession = [[AVCaptureSession alloc] init];
NSLog（@添加视频输入）;
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（@无法添加视频输入）;
}
}
else
{
NSLog（@无法创建视频输入）;
}
}
else
{
NSLog（@无法创建视频捕获设备）;
}
NSLog（@添加音频输入）;
AVCaptureDevice * audioCaptureDevice = [AVCaptureDevice defaultDeviceWithMediaType：AVMediaTypeMuxed];
NSError * error = nil;
AVCaptureDeviceInput * audioInput = [AVCaptureDeviceInput deviceInputWithDevice：audioCaptureDevice error：& error];
if（audioInput）
{
[captureSession addInput：audioInput];
}
NSLog（@添加电影文件输出）;
movieFileOutput = [[AVCaptureMovieFileOutput alloc] init];
movieFileOutput.minFreeDiskSpaceLimit = 1024 * 1024; //<<<设置字节中的最小空格，用于记录在卷上继续
if（[captureSession canAddOutput：movieFileOutput]）
[captureSession addOutput：movieFileOutput];
[self CameraSetOutputProperties]; //（我们称为方法，因为它也必须在更改相机后完成）
NSLog（@设置图像质量）;
[captureSession setSessionPreset：AVCaptureSessionPresetMedium];
if（[captureSession canSetSessionPreset：AVCaptureSessionPreset640x480]）//在设置它们之前检查基于大小的配置
[captureSession setSessionPreset：AVCaptureSessionPreset640x480];
[captureSession startRunning];
}
- （void）CameraSetOutputProperties
{
AVCaptureConnection * CaptureConnection = nil;
NSComparisonResult order = [[UIDevice currentDevice] .systemVersion compare：@5.0.0options：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]];
}
//设置横向（如果需要）
if（[CaptureConnection isVideoOrientationSupported]）
{
AVCaptureVideoOrientation orientation = AVCaptureVideoOrientationPortrait; // AVCaptureVideoOrientationLandscapeRight; //<<<<<<< SET VIDEO ORIENTATION IF LANDSCAPE
[CaptureConnection setVideoOrientation：orientation];
}
}
- ）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 录制最终视频。
- （void）startVideoRecording
{
//创建临时URL
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）
{
//错误 - 如果需要处理
NSLog（@file remove error ;
}
}
//开始录制
[movieFileOutput startRecordingToOutputFileURL：outputURL recordingDelegate：self];
}
- （void）captureOutput：（AVCaptureFileOutput *）captureOutput
didFinishRecordingToOutputFileAtURL：（NSURL *）outputFileURL
fromConnections：
错误：（NSError *）错误
{
NSLog（@didFinishRecordingToOutputFileAtURL - enter）;
BOOL RecordedSuccessfully = YES;
if（[error code]！= noErr）
{
//发生问题：查看录音是否成功。
id value = [[error userInfo] objectForKey：AVErrorRecordingSuccessfullyFinishedKey];
if（value）
{
RecordedSuccessfully = [value boolValue];
}
}
if（RecordedSuccessfully）
{
// ----- RECORDED SUCESSFULLY -----
NSLog（@didFinishRecordingToOutputFileAtURL - 成功）;
ALAssetsLibrary * library = [[ALAssetsLibrary alloc] init];
if（[library videoAtPathIsCompatibleWithSavedPhotosAlbum：outputFileURL]）
{
[library writeVideoAtPathToSavedPhotosAlbum：outputFileURL
completionBlock：^（NSURL * assetURL，NSError * error）
{
if（error）
{
NSLog（@文件保存错误）;
}
else
{
recordedVideoURL = assetURL;
}
}];
}
else
{
NSString * assetURL = [self copyFileToDocuments：outputFileURL];
if（assetURL！= nil）
{
recordedVideoURL = [NSURL URLWithString：assetURL];
}
}
}
}
解决方案
//为以下方法添加一些额外的代码第一个方法
- （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;
}
//准备记录
[recorder setDelegate：self];
[recorder prepareToRecord];
recorder.meteringEnabled = YES;
BOOL audioHWAvailable = audioSession.inputAvailable;
if（！audioHWAvailable）
{
UIAlertView * cantRecordAlert =
[[UIAlertView alloc] initWithTitle：@Warning
message：@音频输入硬件不可用
delegate：nil
cancelButtonTitle：@OK
otherButtonTitles：nil];
[cantRecordAlert show];
return;
}
}
//第二个方法
- （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];
}
// Final Play Video
AVPlayerItem * playerItem = [AVPlayerItem playerItemWithAsset：mixComposition];
AVPlayer * player1 = [AVPlayer playerWithPlayerItem：playerItem];
AVPlayerLayer * playerLayer = [AVPlayerLlayer playerLayerWithPlayer：player1];
[playerLayer setFrame：CGRectMake（0，0，320，480）];
[[[self view] layer] addSublayer：playerLayer];
playerLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
[player1 play];
player1.actionAtItemEnd = AVPlayerActionAtItemEndNone;
I am trying to implement functionality like below
Final Recorded Video = "Capture a video from front camera + Record an audio from video (which i am playing through video player)".
For more understanding please see the attach screen shot.
Using my blocks of codes which is given below : At the end what i get is A video but without audio.
But what i want to trying to implement is "Final recorded video which must be combination of : 'A video which is captured from my front camera + Record only audio from video file which i am playing.'"
Can anyone help or guide me how can i achieve above functionality. Any help will be appreciated.
This is my code.
"Recording" Button Click Method is as following :
-(void) startRecording
{
[self initCaptureSession];
NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle]
pathForResource:@"video"
ofType:@"mp4"]];
[self playMovieAtURL:url];
[self startVideoRecording];
}
"initCaptureSession" : Using this method i am recording a video using front camera using "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 " By using this method i am playing a video
-(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" using this method i have started recording the Final video.
- (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 requried
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 SUCESSFULLY -----
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];
}
}
}
}
解决方案
// Add some extra code for following methods "1st Method"
-(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;
}
}
// 2nd method
-(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];
}
// Final Play Video
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;
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