Question

我必须从iPhone实时发送视频到服务器。我创建捕获会话并使用AVCaptureMovieFileOutput。

NSError *error = nil;



captureSession = [[AVCaptureSession alloc] init];
// find, attach devices
AVCaptureDevice *muxedDevice = [AVCaptureDevice defaultDeviceWithMediaType: AVMediaTypeMuxed];
if (muxedDevice) {
    NSLog (@"got muxedDevice");
    AVCaptureDeviceInput *muxedInput = [AVCaptureDeviceInput deviceInputWithDevice:muxedDevice
                                                                             error:&error];
    if (muxedInput) {
        [captureSession addInput:muxedInput];
    }
} else {
    AVCaptureDevice *videoDevice = [AVCaptureDevice defaultDeviceWithMediaType: AVMediaTypeVideo];
    if (videoDevice) {
        NSLog (@"got videoDevice");
        AVCaptureDeviceInput *videoInput = [AVCaptureDeviceInput deviceInputWithDevice:videoDevice
                                                                                 error:&error];
        if (videoInput) {
            [captureSession addInput: videoInput];
        }
    }
    AVCaptureDevice *audioDevice = [AVCaptureDevice defaultDeviceWithMediaType: AVMediaTypeAudio];
    if (audioDevice) {
        NSLog (@"got audioDevice");
        AVCaptureDeviceInput *audioInput = [AVCaptureDeviceInput deviceInputWithDevice:audioDevice
                                                                                 error:&error];
        if (audioInput) {
            [captureSession addInput: audioInput];
        }
    }
}

// create a preview layer from the session and add it to UI
AVCaptureVideoPreviewLayer *previewLayer = [AVCaptureVideoPreviewLayer layerWithSession:captureSession];
previewLayer.frame = view.layer.bounds;
previewLayer.videoGravity = AVLayerVideoGravityResizeAspect;
previewLayer.orientation = AVCaptureVideoOrientationPortrait;
[view.layer addSublayer:previewLayer];

// create capture file output

captureMovieOutput = [[AVCaptureMovieFileOutput alloc] init];
if (! captureMovieURL) {
    captureMoviePath = [[self getMoviePathWithName:MOVIE_FILE_NAME] retain];
    captureMovieURL = [[NSURL alloc] initFileURLWithPath:captureMoviePath];
}
NSLog (@"recording to %@", captureMovieURL);
[captureSession addOutput:captureMovieOutput];

captureSession = [[AVCaptureSession alloc] init]; // find, attach devices AVCaptureDevice *muxedDevice = [AVCaptureDevice defaultDeviceWithMediaType: AVMediaTypeMuxed]; if (muxedDevice) { NSLog (@"got muxedDevice"); AVCaptureDeviceInput *muxedInput = [AVCaptureDeviceInput deviceInputWithDevice:muxedDevice error:&error]; if (muxedInput) { [captureSession addInput:muxedInput]; } } else { AVCaptureDevice *videoDevice = [AVCaptureDevice defaultDeviceWithMediaType: AVMediaTypeVideo]; if (videoDevice) { NSLog (@"got videoDevice"); AVCaptureDeviceInput *videoInput = [AVCaptureDeviceInput deviceInputWithDevice:videoDevice error:&error]; if (videoInput) { [captureSession addInput: videoInput]; } } AVCaptureDevice *audioDevice = [AVCaptureDevice defaultDeviceWithMediaType: AVMediaTypeAudio]; if (audioDevice) { NSLog (@"got audioDevice"); AVCaptureDeviceInput *audioInput = [AVCaptureDeviceInput deviceInputWithDevice:audioDevice error:&error]; if (audioInput) { [captureSession addInput: audioInput]; } } } // create a preview layer from the session and add it to UI AVCaptureVideoPreviewLayer *previewLayer = [AVCaptureVideoPreviewLayer layerWithSession:captureSession]; previewLayer.frame = view.layer.bounds; previewLayer.videoGravity = AVLayerVideoGravityResizeAspect; previewLayer.orientation = AVCaptureVideoOrientationPortrait; [view.layer addSublayer:previewLayer]; // create capture file output captureMovieOutput = [[AVCaptureMovieFileOutput alloc] init]; if (! captureMovieURL) { captureMoviePath = [[self getMoviePathWithName:MOVIE_FILE_NAME] retain]; captureMovieURL = [[NSURL alloc] initFileURLWithPath:captureMoviePath]; } NSLog (@"recording to %@", captureMovieURL); [captureSession addOutput:captureMovieOutput];

我使用AVAssetExportSession来获取持续时间为10秒的视频。

     AVURLAsset *asset = [AVURLAsset URLAssetWithURL:captureMovieURL options:[NSDictionary  dictionaryWithObject:@"YES" forKey:AVURLAssetPreferPreciseDurationAndTimingKey]];

AVMutableComposition *composition = [AVMutableComposition composition];

CMTime endTime;
CMTime duration = CMTimeMake(6000, 600);
if (asset.duration.value - startFragment.value < 6000)
{
    endTime = asset.duration;
}
else
{
    endTime = CMTimeMake(startFragment.value + 6000, 600);        
}
CMTimeRange editRange = CMTimeRangeMake(startFragment, duration);
startFragment = CMTimeMake(endTime.value, 600);
  NSError *editError = nil;
// and add into your composition 


[composition insertTimeRange:editRange ofAsset:asset atTime:composition.duration error:&editError];

 AVAssetExportSession *exportSession = [AVAssetExportSession exportSessionWithAsset:composition presetName:AVAssetExportPresetPassthrough];

exportSession.shouldOptimizeForNetworkUse = YES;
NSString *name = [NSString stringWithFormat:MOVUE_SEGMENT_NAME, countMovies];
NSString *path = [NSString stringWithFormat:@"file://localhost%@", [self getMoviePathWithName:name]];
NSURL *url = [NSURL URLWithString:path];
NSLog(@"urlsegment = %@", url);
exportSession.outputFileType = AVFileTypeMPEG4;
exportSession.outputURL = url;
[exportSession exportAsynchronouslyWithCompletionHandler:^{

    if (AVAssetExportSessionStatusCompleted == exportSession.status) 
    {
        countMovies++;

        NSLog(@"AVAssetExportSessionStatusCompleted");

    } 
    else if (AVAssetExportSessionStatusFailed == exportSession.status) 
    {                    
         NSLog(@"AVAssetExportSessionStatusFailed: %@", [exportSession.error localizedDescription]);

    } 
    else 
    {
        NSLog(@"Export Session Status: %d", exportSession.status);
    }
}];

AVMutableComposition *composition = [AVMutableComposition composition]; CMTime endTime; CMTime duration = CMTimeMake(6000, 600); if (asset.duration.value - startFragment.value < 6000) { endTime = asset.duration; } else { endTime = CMTimeMake(startFragment.value + 6000, 600); } CMTimeRange editRange = CMTimeRangeMake(startFragment, duration); startFragment = CMTimeMake(endTime.value, 600); NSError *editError = nil; // and add into your composition

如果导出会话状态完成，我会将视频发送到服务器。但它很慢。要获得持续时间为10秒的电影，然后向服务器发送必要的15秒。如果胶片的尺寸小于10秒，则没有任何变化。我怎么解决这个问题？做这个的最好方式是什么？我怎么解决这个问题？什么更适合在服务器上流式传输视频？

Answer 1

使用ffmpeg对元数据进行编码，它可能比AVAssetExportSession更好。但是ffmpeg编码比AVAssetExportSession要困难得多;

如何将视频从iOS设备发送到服务器？

1 个答案: