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我必须从iPhone到服务器实时发送视频。我创建捕获会话并使用AVCaptureMovieFileOutput。如何发送流式视频从iOS设备到服务器?
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];
我用AVAssetExportSession得到与持续时间10秒视频。
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
[组合物insertTimeRange:editRange ofAsset:资产atTime:composition.duration错误:& 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); } }];
我视频发送到服务器,如果出口会话状态完成。但速度很慢。要获得持续10秒的电影,然后发送到服务器需要15秒。如果胶片的尺寸小于10秒,则没有任何变化。 我该如何解决这个问题?做这个的最好方式是什么?我怎么解决这个问题?什么更好地用于服务器上的视频流?