我拍摄了图像的屏幕截图并将其文档目录路径存储到数组中。 我想通过传递这个数组创建一个视频..这是我创建视频的代码
-(void)writeImagesAsMovie:(NSArray *)array toPath:(NSString *)path
{
NSError *error1 = nil;
NSFileManager *fileMgr = [NSFileManager defaultManager];
if ([fileMgr removeItemAtURL:[NSURL fileURLWithPath:path] error:&error1]!=YES)
{
NSLog(@"Unable to delete file: %@", [error1 localizedDescription]);
}
UIImage *first = [UIImage imageWithContentsOfFile:[array objectAtIndex:0]];
CGSize frameSize = first.size;
NSError *error = nil;
AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL:
[NSURL fileURLWithPath:path] fileType:AVFileTypeMPEG4
error:&error];
if(error)
{
NSLog(@"error creating AssetWriter: %@",[error description]);
}
NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:
AVVideoCodecH264, AVVideoCodecKey,
[NSNumber numberWithInt:frameSize.width], AVVideoWidthKey,
[NSNumber numberWithInt:frameSize.height], AVVideoHeightKey,
nil];
AVAssetWriterInput* writerInput = [AVAssetWriterInput
assetWriterInputWithMediaType:AVMediaTypeVideo
outputSettings:videoSettings];
NSMutableDictionary *attributes = [[NSMutableDictionary alloc] init];
[attributes setObject:[NSNumber numberWithUnsignedInt:kCVPixelFormatType_32RGBA] forKey:(NSString*)kCVPixelBufferPixelFormatTypeKey];
[attributes setObject:[NSNumber numberWithUnsignedInt:frameSize.width] forKey:(NSString*)kCVPixelBufferWidthKey];
[attributes setObject:[NSNumber numberWithUnsignedInt:frameSize.height] forKey:(NSString*)kCVPixelBufferHeightKey];
AVAssetWriterInputPixelBufferAdaptor *adaptor = [AVAssetWriterInputPixelBufferAdaptor
assetWriterInputPixelBufferAdaptorWithAssetWriterInput:writerInput
sourcePixelBufferAttributes:attributes];
[videoWriter addInput:writerInput];
// fixes all errors
writerInput.expectsMediaDataInRealTime = YES;
//Start a session:
[videoWriter startWriting];
[videoWriter startSessionAtSourceTime:kCMTimeZero];
CVPixelBufferRef buffer = NULL;
int fps = 25;
int cnt = 0;
for (NSString *filename in array)
{
if (adaptor.assetWriterInput.readyForMoreMediaData)
{
cnt++;
CMTime frameTime = CMTimeMake(1, fps);
CMTime lastTime = CMTimeMake(cnt, fps);
CMTime presentTime = CMTimeAdd(lastTime, frameTime);
UIImage *imgFrame=[UIImage imageWithContentsOfFile:filename];
buffer = [self pixelBufferFromCGImage:[imgFrame CGImage]];
BOOL result = [adaptor appendPixelBuffer:buffer withPresentationTime:presentTime];
if (result == NO) {
NSLog(@"failed to append buffer");
NSLog(@"The error is %@", [videoWriter error]);
}
if(buffer) {
CVBufferRelease(buffer);
}
}
else {
NSLog(@"error");
cnt--;
}
}
// finish the session
[writerInput markAsFinished];
[videoWriter finishWritingWithCompletionHandler:^{
}];
CVPixelBufferPoolRelease(adaptor.pixelBufferPool);
UIAlertView *saveAlert = [[UIAlertView alloc] initWithTitle:@"Complete" message:@"Finished making movie" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
[saveAlert show];
}
- (CVPixelBufferRef) pixelBufferFromCGImage: (CGImageRef) cgiImage {
NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:YES], kCVPixelBufferCGImageCompatibilityKey,
[NSNumber numberWithBool:YES], kCVPixelBufferCGBitmapContextCompatibilityKey,
nil];
CVPixelBufferRef pxbuffer = NULL;
CVPixelBufferCreate(kCFAllocatorDefault, CGImageGetWidth(cgiImage),
CGImageGetHeight(cgiImage), kCVPixelFormatType_32ARGB, (__bridge CFDictionaryRef) options,
&pxbuffer);
CVPixelBufferLockBaseAddress(pxbuffer, 0);
void *pxdata = CVPixelBufferGetBaseAddress(pxbuffer);
CGColorSpaceRef rgbColorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(pxdata, CGImageGetWidth(cgiImage),
CGImageGetHeight(cgiImage), 8, 4*CGImageGetWidth(cgiImage), rgbColorSpace,
kCGImageAlphaNoneSkipFirst);
CGContextConcatCTM(context, CGAffineTransformMakeRotation(0));
CGAffineTransform flipVertical = CGAffineTransformMake(
1, 0, 0, -1, 0, CGImageGetHeight(cgiImage)
);
CGContextConcatCTM(context, flipVertical);
CGAffineTransform flipHorizontal = CGAffineTransformMake(
-1.0, 0.0, 0.0, 1.0, CGImageGetWidth(cgiImage), 0.0
);
CGContextConcatCTM(context, flipHorizontal);
CGContextDrawImage(context, CGRectMake(0, 0, CGImageGetWidth(cgiImage),
CGImageGetHeight(cgiImage)), cgiImage);
CGColorSpaceRelease(rgbColorSpace);
CGContextRelease(context);
CVPixelBufferUnlockBaseAddress(pxbuffer, 0);
return pxbuffer;
}
此代码可帮助我创建视频但视频不正确且所有像素都模糊不清....
答案 0 :(得分：0)
@interface ViewController（）
@end
@implementation ViewController
- （无效）viewDidLoad中
{ [super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- （无效）didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- （IBAction）createVideo：（id）sender
{
NSError *error = nil;
NSFileManager *fileMgr = [NSFileManager defaultManager];
NSString *documentsDirectory = [NSHomeDirectory()
stringByAppendingPathComponent:@"Documents"];
NSString *videoOutputPath = [documentsDirectory stringByAppendingPathComponent:@"test_output.mp4"];
if ([fileMgr removeItemAtPath:videoOutputPath error:&error] != YES)
NSLog(@"Unable to delete file: %@", [error localizedDescription]);
CGSize imageSize = CGSizeMake(400, 200);
NSUInteger fps = 30;
NSMutableArray *imageArray;
imageArray = [[NSMutableArray alloc] initWithObjects:@"photo1.png",@"photo2.png",@"photo3.png",@"photo4.png",@"photo5.png", nil];
NSArray* imagePaths = [[NSBundle mainBundle] pathsForResourcesOfType:@"png" inDirectory:nil];
imageArray = [[NSMutableArray alloc] initWithCapacity:imagePaths.count];
NSLog(@"-->imageArray.count= %lu", (unsigned long)imageArray.count);
for (NSString* path in imagePaths)
{
[imageArray addObject:[UIImage imageWithContentsOfFile:path]];
}
NSLog(@"Start building video from defined frames.");
AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL:
[NSURL fileURLWithPath:videoOutputPath] fileType:AVFileTypeQuickTimeMovie
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];
[videoWriter startWriting];
[videoWriter startSessionAtSourceTime:kCMTimeZero];
CVPixelBufferRef buffer = NULL;
int frameCount = 0;
double numberOfSecondsPerFrame = 6;
double frameDuration = fps * numberOfSecondsPerFrame;
NSLog(@"**************************************************");
for(UIImage * img in imageArray)
{
buffer = [self pixelBufferFromCGImage:[img CGImage]];
BOOL append_ok = NO;
int j = 0;
while (!append_ok && j < 30) {
if (adaptor.assetWriterInput.readyForMoreMediaData) {
NSLog(@"Processing video frame (%d,%d)",frameCount,[imageArray count]);
CMTime frameTime = CMTimeMake(frameCount*frameDuration,(int32_t) fps);
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(@"**************************************************");
[videoWriterInput markAsFinished];
[videoWriter finishWriting];
AVMutableComposition* mixComposition = [AVMutableComposition composition];
NSString *bundleDirectory = [[NSBundle mainBundle] bundlePath];
NSString *audio_inputFilePath = [bundleDirectory stringByAppendingPathComponent:@"30secs.mp3"];
NSURL *audio_inputFileUrl = [NSURL fileURLWithPath:audio_inputFilePath];
NSURL *video_inputFileUrl = [NSURL fileURLWithPath:videoOutputPath];
NSString *outputFilePath = [documentsDirectory stringByAppendingPathComponent:@"final_video.mp4"];
NSURL *outputFileUrl = [NSURL fileURLWithPath:outputFilePath];
if ([[NSFileManager defaultManager] fileExistsAtPath:outputFilePath])
[[NSFileManager defaultManager] removeItemAtPath:outputFilePath error:nil];
CMTime nextClipStartTime = kCMTimeZero;
AVURLAsset* videoAsset = [[AVURLAsset alloc]initWithURL:video_inputFileUrl options:nil];
CMTimeRange video_timeRange = CMTimeRangeMake(kCMTimeZero,videoAsset.duration);
AVMutableCompositionTrack *a_compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
[a_compositionVideoTrack insertTimeRange:video_timeRange ofTrack:[[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] atTime:nextClipStartTime error:nil];
AVURLAsset* audioAsset = [[AVURLAsset alloc]initWithURL:audio_inputFileUrl options:nil];
CMTimeRange audio_timeRange = CMTimeRangeMake(kCMTimeZero, audioAsset.duration);
AVMutableCompositionTrack *b_compositionAudioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
[b_compositionAudioTrack insertTimeRange:audio_timeRange ofTrack:[[audioAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0] atTime:nextClipStartTime error:nil];
AVAssetExportSession* _assetExport = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetHighestQuality];
_assetExport.outputFileType = @"public.mpeg-4";
_assetExport.outputURL = outputFileUrl;
[_assetExport exportAsynchronouslyWithCompletionHandler:
^(void ) {
//[self saveVideoToAlbum:outputFilePath];
}
];
NSLog(@"DONE.....outputFilePath--->%@", outputFilePath);
}
- （CVPixelBufferRef）pixelBufferFromCGImage：（CGImageRef）image
{
CGSize size = CGSizeMake(400, 200);
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,(CGBitmapInfo)
kCGImageAlphaNoneSkipLast);
CGContextConcatCTM(context, CGAffineTransformMakeRotation(0));
CGContextDrawImage(context, CGRectMake(0, 0, CGImageGetWidth(image),
CGImageGetHeight(image)), image);
CGColorSpaceRelease(rgbColorSpace);
CGContextRelease(context);
CVPixelBufferUnlockBaseAddress(pxbuffer, 0);
return pxbuffer;
}
@end
在.h档案中......
导入
import Foundation / Foundation.h
导入CoreMedia / CoreMedia.h
导入CoreVideo / CoreVideo.h
导入CoreGraphics / CoreGraphics.h
导入AVFoundation / AVFoundation.h
导入QuartzCore / QuartzCore.h
@interface ViewController：UIViewController
- （IBAction为）createVideo：（ID）发送者;
@end
并添加以下框架.. CoreMedia.framework
CoreVideo.framework
CoreGraphics.framework
AVFoundation.framework
QuartzCore.framework