我已经使用以下代码成功地从图像创建了视频
-(void)writeImageAsMovie:(NSArray *)array 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];
CVPixelBufferRef buffer = NULL;
buffer = [self pixelBufferFromCGImage:[[array objectAtIndex:0] CGImage]];
[adaptor appendPixelBuffer:buffer withPresentationTime:kCMTimeZero];
//Write samples:
for (int i = 0;i<[array count]; i++)
{
if([writerInput isReadyForMoreMediaData])
{
NSLog(@"inside for loop %d",i);
CMTime frameTime = CMTimeMake(1, 20);
CMTime lastTime=CMTimeMake(i, 20); //i is from 0 to 24 of the loop above
CMTime presentTime=CMTimeAdd(lastTime, frameTime);
buffer = [self pixelBufferFromCGImage:[[array objectAtIndex:i] CGImage]];
[adaptor appendPixelBuffer:buffer withPresentationTime:presentTime];
}
else
{
NSLog(@"error");
i--;
}
}
NSLog(@"outside for loop");
//Finish the session:
[writerInput markAsFinished];
[videoWriter finishWriting];
}
这里我用过CVPixelBufferRef
。取而代之的是,我想将 与CVPixelBufferPoolRef
结合使用AVAssetWriterInputPixelBufferAdaptor
。
任何人都可以提供一个我可以调试和使用的示例吗?