我在AVAssetWriterInputPixelBufferAdaptor中使用pixelBufferPool来创建像素缓冲区以与append方法一起使用.创建4个缓冲区后,pixelBufferPool属性变为NULL;
我设置了我的编写器,输入和适配器,如下所示：
- (BOOL) setupRecorder {
NSError *error = nil;
if([[NSFileManager defaultManager] fileExistsAtPath:[[self tempFileURL] path]])
[[NSFileManager defaultManager] removeItemAtURL:[self tempFileURL] error:&error];
assetWriter = [[AVAssetWriter alloc] initWithURL: [self tempFileURL]
fileType:AVFileTypeQuickTimeMovie
error:&error];
if (error) {
NSLog(@"Error creating asset writer: %@",error);
[assetWriter release];
return NO;
}
// writer
NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:
AVVideoCodecH264,AVVideoCodecKey,[NSNumber numberWithInt:videoWidth],AVVideoWidthKey,[NSNumber numberWithInt:videoHeight],AVVideoHeightKey,nil];
assetWriterInput = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo
outputSettings:videoSettings];
NSDictionary *bufferAttributes = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithInt:kCVPixelFormatType_32BGRA],kCVPixelBufferPixelFormatTypeKey,nil];
adaptor = [[AVAssetWriterInputPixelBufferAdaptor alloc] initWithAssetWriterInput:assetWriterInput sourcePixelBufferAttributes:bufferAttributes];
[adaptor retain];
assetWriterInput.expectsMediaDataInRealTime = YES;
[assetWriter addInput:assetWriterInput];
return YES;
}
我用这个分配像素缓冲区：
- (CVPixelBufferRef) createPixelBufferRef {
CVPixelBufferPoolRef pixelBufferPool = adaptor.pixelBufferPool;
CVPixelBufferRef pixelBuffer = NULL;
CVReturn cvReturn = CVPixelBufferPoolCreatePixelBuffer(NULL,pixelBufferPool,&pixelBuffer);
if(cvReturn != kCVReturnSuccess)
NSLog(@"CVPixelBuffePoolCreatePixelBuffer: %d",cvReturn);
bufferCreatedCount++;
return pixelBuffer;
}
当我完成将像素缓冲区传递给appendPixelBuffer时,我使用CVPixelBufferRelease释放像素缓冲区.在此之前的任何时候,我都不会调用markAsFinished,endSessionAtSourceTime或finishWriting.此外,适配器本身不会为NULL.
我读过的大多数帖子都谈到了由于配置错误配置而导致池从一开始就缺席,但是我的存在,但只是很短的时间.其他人看到过这种行为？
