我在网上有一些代码可以从 iPhone 的相机中捕获视频，然后将其存储到视频文件中，并且运行良好。但我的目的不是将其保存在内存中，而是将其发送到服务器。我发现有一个名为 WOWZA 的免费媒体服务器允许流式传输，而且 Apple 具有 (HSL) HTTP Live Streaming 功能，并且服务器希望视频采用 h.264 格式的视频和 mp3 格式的音频。通过阅读有关 Apple HSL 的一些文档，我还了解到它在播放列表文件中为媒体文件的每个片段提供了不同的 url，然后通过浏览器在设备上以正确的顺序播放。我不确定如何获取手机摄像头记录的文件的小片段，以及如何将其转换为所需的格式。以下是捕获视频的代码：
实施文件
#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
我找到了这个链接，它显示了如何在帧中捕获视频。但我不确定是否以帧的形式捕获视频是否有助于我将 h.264 格式的视频发送到服务器。可以做到这一点，如果可以，那怎么做？
在这里，提出问题的人说（在问题下方的评论中）他能够成功地做到这一点，但他没有提到他是如何拍摄视频的。
请告诉我应该使用哪种数据类型来获取捕获的视频的小片段，以及如何将捕获的数据转换为所需的格式并将其发送到服务器。