以编程方式在iOS中录制视频 [英] Video recording in iOS programmatically
本文介绍了以编程方式在iOS中录制视频的处理方法，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
我正在尝试实现以下功能
I am trying to implement functionality like below
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（我正在通过视频播放器播放的音频）。
Final Recorded Video = "Capture a video from front camera + Record an audio from video (which I am playing through video player)".
更多信息请参阅附加屏幕快照。
For more understanding please see the attach screen shot.
使用下面提供的代码块：最后我得到的是视频但没有音频。
Using my blocks of codes which is given below: At the end what I get is A video but without audio.
但是我要尝试实现的是 最终录制的视频，该视频必须与以下内容进行组合： A从前置摄像头捕获的视频 + 仅记录我正在播放的视频文件中的音频。'
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.'"
如何我实现了上述功能吗？
How can I achieve above functionality?
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 ：使用这种方法使用
AVCaptureSession
"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 通过这种方法，我正在播放视频
"-(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 我已经开始使用这种方法
"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 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];
}
}
}
}
推荐答案
//为以下方法添加一些额外的代码第一种方法
-(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;
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