从相机胶卷 - iOS sdk的图像创建视频 [英] create video from images of camera roll - iOS sdk
本文介绍了从相机胶卷 - iOS sdk的图像创建视频的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我使用以下代码从图片中创建视频。
I have used following code to create video from the images.
当我从网络下载的相机胶卷或屏幕截图中选择图片时，此代码工作正常但是从相机拍摄的所选图像显示在电影中放大。
This code works fine when i select the image from camera roll which is downloaded from web or the screenshot but the image selected which are taken from camera shows zoomed in in the movie.
我不知道相机的图像有什么问题。
I don't know what is wrong with the images of camera.
任何人都可以帮我解决这个问题。
can anyone please help me resolve this issue.
-(IBAction)createV:(id)sender
{
NSString *documentsDirectory = [NSHomeDirectory()
stringByAppendingPathComponent:@"Documents"];
NSString *videoOutputPath = [documentsDirectory stringByAppendingPathComponent:@"test_output.mp4"];
CGSize imageSize = [DatabaseAccess getusersetsize];
double nospf =[[[NSUserDefaults standardUserDefaults] valueForKey:@"duration"] intValue];
NSUInteger fps = 10;
NSMutableArray *imageArray;// = [DatabaseAccess getimagelist:@"select imgname from tbl_userimage"];
NSArray* imagePaths = [DatabaseAccess getimagelist:@"select imgname,strftime('%d-%m-%Y', tdate) as tdate from tbl_userimage"];
imageArray = [[NSMutableArray alloc] initWithCapacity:imagePaths.count];
int i=0;
for (NSString* path in [imagePaths valueForKey:@"image"] )
{
if ([[NSUserDefaults standardUserDefaults] boolForKey:@"disdate"])
{
CGSize imgsize = [DatabaseAccess getusersetsize];
//[imageArray addObject:[[DatabaseAccess drawText:[[imagePaths valueForKey:@"date"] objectAtIndex:i] inImage:[UIImage imageWithContentsOfFile:[DatabaseAccess documentsPathForFileName:path]] atPoint:CGPointMake(imgsize.width-250,imgsize.height-60) ] fixOrientation]];
[imageArray addObject:[DatabaseAccess drawText:[[imagePaths valueForKey:@"date"] objectAtIndex:i] inImage:[UIImage imageWithContentsOfFile:[DatabaseAccess documentsPathForFileName:path]] atPoint:CGPointMake(imgsize.width-250,imgsize.height-60) ]];
}
else
{
[imageArray addObject:[UIImage imageWithContentsOfFile:[DatabaseAccess documentsPathForFileName:path]]];
NSLog(@"%@",path);
// [imageArray addObject:[UIImage imageNamed:path]];
}
i++;
}
[self exportImages:imageArray asVideoToPath:videoOutputPath withFrameSize:imageSize framesPerSecond:fps numberOfSecondsPerFrame:nospf];
}
- (void)exportImages:(NSMutableArray *)imageArray asVideoToPath:(NSString *)videoOutputPath withFrameSize:(CGSize)imageSize framesPerSecond:(NSUInteger)fps numberOfSecondsPerFrame:(double)numberOfSecondsPerFrame {
NSError *error = nil;
NSString *documentsDirectory = [NSHomeDirectory()
stringByAppendingPathComponent:@"Documents"];
NSFileManager *fileMgr = [NSFileManager defaultManager];
if ([fileMgr removeItemAtPath:videoOutputPath error:&error] != YES)
NSLog(@"Unable to delete file: %@", [error localizedDescription]);
////////////// end setup ///////////////////////////////////
NSLog(@"Start building video from defined frames.");
AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL:
[NSURL fileURLWithPath:videoOutputPath] fileType:AVFileTypeMPEG4 error:&error];
NSParameterAssert(videoWriter);
NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:
AVVideoCodecH264, AVVideoCodecKey,
[NSNumber numberWithInt:imageSize.width], AVVideoWidthKey,
[NSNumber numberWithInt:imageSize.height], AVVideoHeightKey,
nil];
AVAssetWriterInput* videoWriterInput = [AVAssetWriterInput
assetWriterInputWithMediaType:AVMediaTypeVideo
outputSettings:videoSettings];
AVAssetWriterInputPixelBufferAdaptor *adaptor = [AVAssetWriterInputPixelBufferAdaptor
assetWriterInputPixelBufferAdaptorWithAssetWriterInput:videoWriterInput
sourcePixelBufferAttributes:nil];
NSParameterAssert(videoWriterInput);
NSParameterAssert([videoWriter canAddInput:videoWriterInput]);
videoWriterInput.expectsMediaDataInRealTime = YES;
[videoWriter addInput:videoWriterInput];
//Start a session:
[videoWriter startWriting];
[videoWriter startSessionAtSourceTime:kCMTimeZero];
CVPixelBufferRef buffer = NULL;
//convert uiimage to CGImage.
int frameCount = 0;
//double numberOfSecondsPerFrame = 6;
double frameDuration = fps * numberOfSecondsPerFrame;
//for(VideoFrame * frm in imageArray)
NSLog(@"**************************************************");
for(UIImage * img in imageArray)
{
//UIImage * img = frm._imageFrame;
buffer = [self pixelBufferFromCGImage:[img CGImage]];
BOOL append_ok = NO;
int j = 0;
while (!append_ok && j < 30) {
if (adaptor.assetWriterInput.readyForMoreMediaData) {
//print out status:
NSLog(@"Processing video frame (%d,%lu)",frameCount,(unsigned long)[imageArray count]);
CMTime frameTime = CMTimeMake(frameCount,(int32_t) numberOfSecondsPerFrame);
//CMTime frameTime = CMTimeMake(frameCount*frameDuration,(int32_t) fps);
// NSLog(@"%@",frameTime);
append_ok = [adaptor appendPixelBuffer:buffer withPresentationTime:frameTime];
if(!append_ok){
NSError *error = videoWriter.error;
if(error!=nil) {
NSLog(@"Unresolved error %@,%@.", error, [error userInfo]);
}
}
}
else {
printf("adaptor not ready %d, %d\n", frameCount, j);
[NSThread sleepForTimeInterval:0.1];
}
j++;
}
if (!append_ok) {
printf("error appending image %d times %d\n, with error.", frameCount, j);
}
frameCount++;
}
NSLog(@"**************************************************");
//Finish the session:
[videoWriterInput markAsFinished];
[videoWriter finishWriting];
NSLog(@"Write Ended");
[self playMovie:videoOutputPath];
}
- (CVPixelBufferRef) pixelBufferFromCGImage: (CGImageRef) image {
// CGSize size = CGSizeMake(400, 200);
CGSize size = [DatabaseAccess getusersetsize];
NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:YES], kCVPixelBufferCGImageCompatibilityKey,
[NSNumber numberWithBool:YES], kCVPixelBufferCGBitmapContextCompatibilityKey,
nil];
CVPixelBufferRef pxbuffer = NULL;
CVReturn status = CVPixelBufferCreate(kCFAllocatorDefault,
size.width,
size.height,
kCVPixelFormatType_32ARGB,
(__bridge CFDictionaryRef) options,
&pxbuffer);
if (status != kCVReturnSuccess){
NSLog(@"Failed to create pixel buffer");
}
CVPixelBufferLockBaseAddress(pxbuffer, 0);
void *pxdata = CVPixelBufferGetBaseAddress(pxbuffer);
CGColorSpaceRef rgbColorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(pxdata, size.width,
size.height, 8, 4*size.width, rgbColorSpace,
kCGImageAlphaPremultipliedFirst);
//kCGImageAlphaNoneSkipFirst);
NSParameterAssert(context);
//CGContextConcatCTM(context, frameTransform);
CGContextConcatCTM(context, CGAffineTransformMakeRotation(0));
CGContextDrawImage(context, CGRectMake(0, 0, CGImageGetWidth(image),
CGImageGetHeight(image)), image);
CGColorSpaceRelease(rgbColorSpace);
CGContextRelease(context);
CVPixelBufferUnlockBaseAddress(pxbuffer, 0);
return pxbuffer;
}
推荐答案
使用此代码
-(UIImage*) scaleImage: (UIImage*)image toSize:(CGSize)newSize {
UIGraphicsBeginImageContext(newSize);
[image drawInRect:CGRectMake(0, 0, newSize.width, newSize.height)];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return newImage;
}
resize UIImage befor将其转换为CGImage，
确保调整大小image.width为16的倍数。
resize UIImage befor converting it to CGImage, make sure you resize image.width in multiple of 16.
CGSize your_size = CGSizeMake(1600, 800);
UIImage *tempImg = [self scaleImage:img toSize:your_size..];
buffer = [self pixelBufferFromCGImage:[tempImg CGImage]];
这篇关于从相机胶卷 - iOS sdk的图像创建视频的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
