我对编程比较陌生，虽然我对正常功能没问题，但我对视频编辑完全陌生
所以我设法在网上找到了一些代码来完成如下所示的工作：
- (void)writeImagesAsMovie:(NSArray *)array {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDirectory, YES);
NSString *documentDirectory = [paths objectAtIndex:0];
NSString *saveLocation = [documentDirectory stringByAppendingString:@"/temp.mov"];
if ([[NSFileManager defaultManager] fileExistsAtPath:saveLocation]) {
[[NSFileManager defaultManager] removeItemAtPath:saveLocation error:NULL];
}
UIImage *first = [array objectAtIndex:0];
CGSize frameSize = first.size;
NSError *error = nil;
AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL:
[NSURL fileURLWithPath:saveLocation] fileType:AVFileTypeQuickTimeMovie
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_32ARGB] 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;
buffer = [self pixelBufferFromCGImage:[first CGImage]];
BOOL result = [adaptor appendPixelBuffer:buffer withPresentationTime:kCMTimeZero];
if (result == NO) //failes on 3GS, but works on iphone 4
NSLog(@"failed to append buffer");
if(buffer) {
CVBufferRelease(buffer);
}
//int reverseSort = NO;
NSArray *newArray = array;
int fps = 10;
int i = 0;
for (UIImage *image in newArray)
{
[NSThread sleepForTimeInterval:0.02];
if (adaptor.assetWriterInput.readyForMoreMediaData) {
i++;
CMTime frameTime = CMTimeMake(1, fps);
CMTime lastTime = CMTimeMake(i, fps);
CMTime presentTime = CMTimeAdd(lastTime, frameTime);
UIImage *imgFrame = image;//[UIImage imageWithContentsOfFile:filePath] ;
buffer = [self pixelBufferFromCGImage:[imgFrame CGImage]];
BOOL result = [adaptor appendPixelBuffer:buffer withPresentationTime:presentTime];
if (result == NO) //failes on 3GS, but works on iphone 4
{
NSLog(@"failed to append buffer");
NSLog(@"The error is %@", [videoWriter error]);
[NSThread sleepForTimeInterval:0.5];
}
if(buffer) {
CVBufferRelease(buffer);
}
} else {
NSLog(@"error");
i--;
}
}
//Finish the session:
[writerInput markAsFinished];
[videoWriter finishWriting];
CVPixelBufferPoolRelease(adaptor.pixelBufferPool);
NSLog(@"Movie created successfully");
}
- (CVPixelBufferRef) pixelBufferFromCGImage: (CGImageRef) image
{
NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:YES], kCVPixelBufferCGImageCompatibilityKey,
[NSNumber numberWithBool:YES], kCVPixelBufferCGBitmapContextCompatibilityKey,
nil];
CVPixelBufferRef pxbuffer = NULL;
CVPixelBufferCreate(kCFAllocatorDefault, CGImageGetWidth(image),
CGImageGetHeight(image), kCVPixelFormatType_32ARGB, (__bridge CFDictionaryRef) options,
&pxbuffer);
CVPixelBufferLockBaseAddress(pxbuffer, 0);
void *pxdata = CVPixelBufferGetBaseAddress(pxbuffer);
CGColorSpaceRef rgbColorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef context = CGBitmapContextCreate(pxdata, CGImageGetWidth(image),
CGImageGetHeight(image), 8, 4*CGImageGetWidth(image), rgbColorSpace,
kCGImageAlphaNoneSkipFirst);
CGContextConcatCTM(context, CGAffineTransformMakeRotation(0));
// CGAffineTransform flipVertical = CGAffineTransformMake(
// 1, 0, 0, -1, 0, CGImageGetHeight(image)
// );
// CGContextConcatCTM(context, flipVertical);
// CGAffineTransform flipHorizontal = CGAffineTransformMake(
// -1.0, 0.0, 0.0, 1.0, CGImageGetWidth(image), 0.0
// );
//
// CGContextConcatCTM(context, flipHorizontal);
CGContextDrawImage(context, CGRectMake(0, 0, CGImageGetWidth(image),
CGImageGetHeight(image)), image);
CGColorSpaceRelease(rgbColorSpace);
CGContextRelease(context);
CVPixelBufferUnlockBaseAddress(pxbuffer, 0);
return pxbuffer;
}
但是我遇到的问题是视频的输出有些损坏（它确实可以播放，尽管它有如下所示的有趣的线条：
我会很感激任何帮助
非常感谢
托马斯