从 UIImages 问题构建视频

Question

我想从 UIImages 数组创建电影。我试过这段代码：

-(void)writeImageAsMovie:(UIImage*)image toPath:(NSString*)path size:(CGSize)size          duration:(int)duration 
{
NSError *error = nil;
AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL:
                              [NSURL fileURLWithPath:path] fileType:AVFileTypeQuickTimeMovie
                                                          error:&error];
NSParameterAssert(videoWriter);

NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:
                               AVVideoCodecH264, AVVideoCodecKey,
                               [NSNumber numberWithInt:size.width], AVVideoWidthKey,
                               [NSNumber numberWithInt:size.height], AVVideoHeightKey,
                               nil];
AVAssetWriterInput* writerInput = [[AVAssetWriterInput
                                    assetWriterInputWithMediaType:AVMediaTypeVideo
                                    outputSettings:videoSettings] retain];

AVAssetWriterInputPixelBufferAdaptor *adaptor = [AVAssetWriterInputPixelBufferAdaptor
                                                 assetWriterInputPixelBufferAdaptorWithAssetWriterInput:writerInput
                                                 sourcePixelBufferAttributes:nil];
NSParameterAssert(writerInput);
NSParameterAssert([videoWriter canAddInput:writerInput]);
[videoWriter addInput:writerInput];

//Start a session:
[videoWriter startWriting];
[videoWriter startSessionAtSourceTime:kCMTimeZero];

//Write samples:
CVPixelBufferRef buffer = [Utils pixelBufferFromCGImage:image.CGImage size:size];
[adaptor appendPixelBuffer:buffer withPresentationTime:kCMTimeZero];
[adaptor appendPixelBuffer:buffer withPresentationTime:CMTimeMake(duration-1, 2)];

//Finish the session:
[writerInput markAsFinished];
[videoWriter endSessionAtSourceTime:CMTimeMake(duration, 2)];
[videoWriter finishWriting];
}

但是输出不行。

图片是这样的：

http://imageshack.us/photo/my-images/854/screenshot20120921at140.png/

视频输出为：

http://imageshack.us/photo/my-images/856/screenshot20120921at140.png/

Answer 1

检查您为缓冲区指定的大小。 试试这个尺寸，看看一次：

buffer = [self pixelBufferFromCGImage:[[array objectAtIndex:0] CGImage] size:CGSizeMake(480, 320)];

Answer 2

试试这个 https://github.com/meslater/MSImageMovieEncoder