这是一个similar question。我也有同样的问题。这是我的代码
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.packagesBufferMutableArray = [NSMutableArray array];
self.fps = 25;
[self initDateFormatter];
// [self setupCaptureSession];
[self performSelector:@selector(stopWork) withObject:nil afterDelay:5];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
self.isExtra = YES;
[self.captureSession startRunning];
}
- (void)initDateFormatter {
self.dateFormatter = [NSDateFormatter new];
[_dateFormatter setDateFormat:@"yy-MM-dd--HH-mm-ss"];
}
- (NSString *)generateFilePathForMovie {
return [NSString stringWithFormat:@"%@/%@.mov",
[NSHomeDirectory() stringByAppendingPathComponent:@"Documents"],
[_dateFormatter stringFromDate:[NSDate date]]];
}
- (NSDictionary *)settingsForWriterInput {
int bitRate = (300 + /*self.currentQuality*/5 * 90) * 1024; //NORMAL 750 * 1024
NSDictionary *codecSettings = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt:bitRate], AVVideoAverageBitRateKey,
nil];
NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:
AVVideoCodecH264, AVVideoCodecKey,
[NSNumber numberWithInt:480], AVVideoWidthKey,
[NSNumber numberWithInt:320], AVVideoHeightKey,
codecSettings, AVVideoCompressionPropertiesKey,
nil];
return videoSettings;
}
- (AVAssetWriterInput *)createVideoWriterInput {
NSDictionary *videoSettings = [self settingsForWriterInput];
return [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo
outputSettings:videoSettings];
}
- (void)setupCaptureSession
{
NSError *error = nil;
self.captureSession = [[AVCaptureSession alloc] init];
self.captureSession.sessionPreset = AVCaptureSessionPresetMedium;
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
// Create a device input with the device and add it to the session.
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:&error];
if (!input)
{
// Handling the error appropriately.
}
[self.captureSession addInput:input];
// Create a VideoDataOutput and add it to the session
AVCaptureVideoDataOutput *output = [[AVCaptureVideoDataOutput alloc] init];
self.assetWriterInput =[self createVideoWriterInput];// [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo outputSettings:outputSettings];
self.assetWriterInput.expectsMediaDataInRealTime = YES;
AVAssetWriter *assetWriter = [[AVAssetWriter alloc] initWithURL:[NSURL fileURLWithPath:[self generateFilePathForMovie]] fileType:AVFileTypeMPEG4 error:&error];
[assetWriter addInput:self.assetWriterInput];
self.assetWriterPixelBufferAdaptor = [[AVAssetWriterInputPixelBufferAdaptor alloc] initWithAssetWriterInput:self.assetWriterInput sourcePixelBufferAttributes:
[NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithInt:kCVPixelFormatType_32BGRA],kCVPixelBufferPixelFormatTypeKey, nil]];
[self.captureSession addOutput:output];
// Configure your output.
dispatch_queue_t queue = dispatch_queue_create("myQueue", NULL);
[output setSampleBufferDelegate:self queue:queue];
dispatch_release(queue);
// Specify the pixel format
output.videoSettings = [NSDictionary dictionaryWithObject:[NSNumber numberWithInt:kCVPixelFormatType_32BGRA]
forKey:(id)kCVPixelBufferPixelFormatTypeKey];
// If you wish to cap the frame rate to a known value, such as 15 fps, set
// minFrameDuration.
for (AVCaptureOutput* output in self.captureSession.outputs)
{
if ([output isKindOfClass:[AVCaptureVideoDataOutput class]])
{
AVCaptureConnection* connection = [output connectionWithMediaType:AVMediaTypeVideo];
CMTimeShow(connection.videoMinFrameDuration);
CMTimeShow(connection.videoMaxFrameDuration);
CMTime frameDuration = CMTimeMake(1, self.fps);
if (connection.isVideoMinFrameDurationSupported)
connection.videoMinFrameDuration = frameDuration;
if (connection.isVideoMaxFrameDurationSupported)
connection.videoMaxFrameDuration = frameDuration;
CMTimeShow(connection.videoMinFrameDuration);
CMTimeShow(connection.videoMaxFrameDuration);
}
else
{
AVCaptureConnection* connection = [output connectionWithMediaType:AVMediaTypeVideo];
CMTimeShow(connection.videoMinFrameDuration);
CMTimeShow(connection.videoMaxFrameDuration);
if (connection.isVideoMinFrameDurationSupported)
connection.videoMinFrameDuration = CMTimeMake(1, 20);
if (connection.isVideoMaxFrameDurationSupported)
connection.videoMaxFrameDuration = CMTimeMake(1, 20);
CMTimeShow(connection.videoMinFrameDuration);
CMTimeShow(connection.videoMaxFrameDuration);
}
}
// Start the session running to start the flow of data
[assetWriter startWriting];
[assetWriter startSessionAtSourceTime:kCMTimeZero];
[self.captureSession startRunning];
// Assign session to an ivar.
}
- (NSMutableDictionary *)createEmptyPackage
{
return [NSMutableDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithInteger:0], @"framesCount", [NSMutableArray array], @"framesArray", nil];
}
- (void)updateCurrentPackageWithFrameImage:(UIImage *)frameImage
{
if (self.currentPackageMutableDictionary == nil)
{
NSLog(@"new package with number %d", self.packagesBufferMutableArray.count);
self.currentPackageMutableDictionary = [self createEmptyPackage];
}
NSInteger framesCount = [[self.currentPackageMutableDictionary objectForKey:@"framesCount"] integerValue];
NSMutableArray *framesArray = [self.currentPackageMutableDictionary objectForKey:@"framesArray"];
NSLog(@"added %d frame at current package", framesCount);
framesCount ++;
[framesArray addObject:frameImage];
[self.currentPackageMutableDictionary setObject:[NSNumber numberWithInteger:framesCount] forKey:@"framesCount"];
if (framesCount == self.fps)
{
[self.packagesBufferMutableArray addObject:[NSDictionary dictionaryWithDictionary:self.currentPackageMutableDictionary]];
self.currentPackageMutableDictionary = nil;
if ((self.packagesBufferMutableArray.count == 31) && !self.isExtra)
{
NSLog(@"remove old package");
[self.packagesBufferMutableArray removeObjectAtIndex:0];
}
}
}
// Delegate routine that is called when a sample buffer was written
- (void)captureOutput:(AVCaptureOutput *)captureOutput
didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer
fromConnection:(AVCaptureConnection *)connection
{
// Create a UIImage from the sample buffer data
UIImage *image = [self imageFromSampleBuffer:sampleBuffer];
// UIImageWriteToSavedPhotosAlbum(image, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
[self updateCurrentPackageWithFrameImage:image];
// UIImageView *imageView = [[UIImageView alloc] initWithImage:image];
// imageView.frame = CGRectMake(0, 0, image.size.width, image.size.height);
// [self.view addSubview:imageView];
CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
// a very dense way to keep track of the time at which this frame
// occurs relative to the output stream, but it's just an example!
static int64_t frameNumber = 0;
if(self.assetWriterInput.readyForMoreMediaData)
[self.assetWriterPixelBufferAdaptor appendPixelBuffer:imageBuffer
withPresentationTime:CMTimeMake(frameNumber, 24)];
frameNumber++;
}
- (void) image: (UIImage *) image
didFinishSavingWithError: (NSError *) error
contextInfo: (void *) contextInfo
{
}
- (void)startWork
{
}
- (void)stopWork
{
[self.captureSession stopRunning];
[self.assetWriter finishWriting];
}
// Create a UIImage from sample buffer data
- (UIImage *) imageFromSampleBuffer:(CMSampleBufferRef) sampleBuffer
{
// Get a CMSampleBuffer's Core Video image buffer for the media data
CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
// Lock the base address of the pixel buffer
CVPixelBufferLockBaseAddress(imageBuffer, 0);
// Get the number of bytes per row for the pixel buffer
void *baseAddress = CVPixelBufferGetBaseAddress(imageBuffer);
// Get the number of bytes per row for the pixel buffer
size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);
// Get the pixel buffer width and height
size_t width = CVPixelBufferGetWidth(imageBuffer);
size_t height = CVPixelBufferGetHeight(imageBuffer);
// Create a device-dependent RGB color space
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
// Create a bitmap graphics context with the sample buffer data
CGContextRef context = CGBitmapContextCreate(baseAddress, width, height, 8,
bytesPerRow, colorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst);
// Create a Quartz image from the pixel data in the bitmap graphics context
CGImageRef quartzImage = CGBitmapContextCreateImage(context);
// Unlock the pixel buffer
CVPixelBufferUnlockBaseAddress(imageBuffer,0);
// Free up the context and color space
CGContextRelease(context);
CGColorSpaceRelease(colorSpace);
// Create an image object from the Quartz image
UIImage *image = [UIImage imageWithCGImage:quartzImage];
// Release the Quartz image
CGImageRelease(quartzImage);
return (image);
}
所以，它创建了mov文件，但我无法与任何玩家一起运行。
QuickTime Player can not open the "14-02-02 - 21-29-11.mov», as the movie file format is not recognized.
也许我必须设置一些其他参数或使用其他算法？
有人可以说出或举一个例子吗？