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[英]What's the best way of live streaming iphone camera to a media server?
[英]How to send the video captured from iPhone's camera to a server for live streaming?
我有一些在線代碼從iPhone的相機捕獲視頻,然后將其存儲到視頻文件,它工作正常。 但我的目的不是將其保存在內存中,而是將其發送到服務器。 我發現有一個名為WOWZA的免費媒體服務器,它允許流媒體和Apple有(HSL)HTTP直播流功能,服務器希望視頻為h.264格式的視頻和mp3的音頻。 通過閱讀關於Apple HSL的一些文檔,我也發現它在播放列表文件中為媒體文件的每個片段提供了不同的URL,然后通過瀏覽器以正確的順序在設備上播放。 我不知道如何獲取手機攝像頭錄制的文件的小片段,以及如何將其轉換為所需的格式。 以下是捕獲視頻的代碼:
實施檔案
#import "THCaptureViewController.h"
#import <AVFoundation/AVFoundation.h>
#import "THPlayerViewController.h"
#define VIDEO_FILE @"test.mov"
@interface THCaptureViewController ()
@property (nonatomic, strong) AVCaptureSession *captureSession;
@property (nonatomic, strong) AVCaptureMovieFileOutput *captureOutput;
@property (nonatomic, weak) AVCaptureDeviceInput *activeVideoInput;
@property (nonatomic, strong) AVCaptureVideoPreviewLayer *previewLayer;
@end
@implementation THCaptureViewController
- (void)viewDidLoad
{
[super viewDidLoad];
#if TARGET_IPHONE_SIMULATOR
self.simulatorView.hidden = NO;
[self.view bringSubviewToFront:self.simulatorView];
#else
self.simulatorView.hidden = YES;
[self.view sendSubviewToBack:self.simulatorView];
#endif
// Hide the toggle button if device has less than 2 cameras. Does 3GS support iOS 6?
self.toggleCameraButton.hidden = [[AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo] count] < 2;
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0),
^{
[self setUpCaptureSession];
});
}
#pragma mark - Configure Capture Session
- (void)setUpCaptureSession
{
self.captureSession = [[AVCaptureSession alloc] init];
NSError *error;
// Set up hardware devices
AVCaptureDevice *videoDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
if (videoDevice) {
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:videoDevice error:&error];
if (input) {
[self.captureSession addInput:input];
self.activeVideoInput = input;
}
}
AVCaptureDevice *audioDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio];
if (audioDevice) {
AVCaptureDeviceInput *audioInput = [AVCaptureDeviceInput deviceInputWithDevice:audioDevice error:&error];
if (audioInput) {
[self.captureSession addInput:audioInput];
}
}
//Create a VideoDataOutput and add it to the session
AVCaptureVideoDataOutput *output = [[AVCaptureVideoDataOutput alloc] init];
[self.captureSession addOutput:output];
// Setup the still image file output
AVCaptureStillImageOutput *stillImageOutput = [[AVCaptureStillImageOutput alloc] init];
[stillImageOutput setOutputSettings:@{AVVideoCodecKey : AVVideoCodecJPEG}];
if ([self.captureSession canAddOutput:stillImageOutput]) {
[self.captureSession addOutput:stillImageOutput];
}
// Start running session so preview is available
[self.captureSession startRunning];
// Set up preview layer
dispatch_async(dispatch_get_main_queue(), ^{
self.previewLayer = [AVCaptureVideoPreviewLayer layerWithSession:self.captureSession];
self.previewLayer.frame = self.previewView.bounds;
self.previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
[[self.previewLayer connection] setVideoOrientation:[self currentVideoOrientation]];
[self.previewView.layer addSublayer:self.previewLayer];
});
}
#pragma mark - Start Recording
- (IBAction)startRecording:(id)sender {
if ([sender isSelected]) {
[sender setSelected:NO];
[self.captureOutput stopRecording];
} else {
[sender setSelected:YES];
if (!self.captureOutput) {
self.captureOutput = [[AVCaptureMovieFileOutput alloc] init];
[self.captureSession addOutput:self.captureOutput];
}
// Delete the old movie file if it exists
//[[NSFileManager defaultManager] removeItemAtURL:[self outputURL] error:nil];
[self.captureSession startRunning];
AVCaptureConnection *videoConnection = [self connectionWithMediaType:AVMediaTypeVideo fromConnections:self.captureOutput.connections];
if ([videoConnection isVideoOrientationSupported]) {
videoConnection.videoOrientation = [self currentVideoOrientation];
}
if ([videoConnection isVideoStabilizationSupported]) {
videoConnection.enablesVideoStabilizationWhenAvailable = YES;
}
[self.captureOutput startRecordingToOutputFileURL:[self outputURL] recordingDelegate:self];
}
// Disable the toggle button if recording
self.toggleCameraButton.enabled = ![sender isSelected];
}
- (AVCaptureConnection *)connectionWithMediaType:(NSString *)mediaType fromConnections:(NSArray *)connections {
for (AVCaptureConnection *connection in connections) {
for (AVCaptureInputPort *port in [connection inputPorts]) {
if ([[port mediaType] isEqual:mediaType]) {
return connection;
}
}
}
return nil;
}
#pragma mark - AVCaptureFileOutputRecordingDelegate
- (void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error {
if (!error) {
[self presentRecording];
} else {
NSLog(@"Error: %@", [error localizedDescription]);
}
}
#pragma mark - Show Last Recording
- (void)presentRecording
{
NSString *tracksKey = @"tracks";
AVAsset *asset = [AVURLAsset assetWithURL:[self outputURL]];
[asset loadValuesAsynchronouslyForKeys:@[tracksKey] completionHandler:^{
NSError *error;
AVKeyValueStatus status = [asset statusOfValueForKey:tracksKey error:&error];
if (status == AVKeyValueStatusLoaded) {
dispatch_async(dispatch_get_main_queue(), ^{
UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];
THPlayerViewController *controller = [mainStoryboard instantiateViewControllerWithIdentifier:@"THPlayerViewController"];
controller.title = @"Capture Recording";
controller.asset = asset;
[self presentViewController:controller animated:YES completion:nil];
});
}
}];
}
#pragma mark - Recoding Destination URL
- (NSURL *)outputURL
{
NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSLog(@"documents Directory: %@", documentsDirectory);
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:VIDEO_FILE];
NSLog(@"output url: %@", filePath);
return [NSURL fileURLWithPath:filePath];
}
@end
我發現此鏈接顯示了如何捕獲幀中的視頻。 但我不確定如果以幀為單位捕獲視頻將幫助我將h.264格式的視頻發送到服務器。 可以這樣做,如果是,那么如何?
在這里 ,提出問題的人說(在問題下面的評論中)他能夠成功地做到這一點,但他沒有提到他是如何捕獲視頻的。
請告訴我應該使用哪種數據類型來獲取捕獲的視頻的小段,以及如何以所需格式轉換捕獲的數據並將其發送到服務器。
你可以使用live sdk。你必須設置nginx驅動的流媒體服務器。 請關注此鏈接。我使用過它,這是非常有效的解決方案。 https://github.com/ltebean/Live
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