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iphone - AVAssetWriterInputPixelBufferAdaptor appendPixelBuffer

转载 作者:可可西里 更新时间:2023-11-01 06:21:02 25 4
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我使用下面的代码将图像写入视频

-(void) writeImagesToMovieAtPath:(NSString *) path withSize:(CGSize) size
{
NSLog(@"Write Started");

NSError *error = nil;

AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL:
[NSURL fileURLWithPath:path] fileType:AVFileTypeMPEG4
error:&error];
NSParameterAssert(videoWriter);

NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:
AVVideoCodecH264, AVVideoCodecKey,
[NSNumber numberWithInt:size.width], AVVideoWidthKey,
[NSNumber numberWithInt:size.height], AVVideoHeightKey,
nil];

AVAssetWriterInput* videoWriterInput = [[AVAssetWriterInput
assetWriterInputWithMediaType:AVMediaTypeVideo
outputSettings:videoSettings] retain];


AVAssetWriterInputPixelBufferAdaptor *adaptor = [AVAssetWriterInputPixelBufferAdaptor
assetWriterInputPixelBufferAdaptorWithAssetWriterInput:videoWriterInput
sourcePixelBufferAttributes:nil];

NSParameterAssert(videoWriterInput);
NSParameterAssert([videoWriter canAddInput:videoWriterInput]);
videoWriterInput.expectsMediaDataInRealTime = YES;
[videoWriter addInput:videoWriterInput];

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

CVPixelBufferRef buffer = NULL;

//convert uiimage to CGImage.

int frameCount = 16;
int kRecordingFPS = 30;
UIImage * im = [UIImage imageNamed:@"IMG_0103.JPG"];

NSArray * imageArray = [[NSArray alloc]initWithObjects:im,im,im,im,im,im,im,im,im,im,im,im,im,im,im,im, nil];

for(UIImage * img in imageArray)
{
buffer = [self pixelBufferFromCGImage:[img CGImage] andSize:size];

BOOL append_ok = NO;
int j = 0;
while (!append_ok && j < 30)
{
if (adaptor.assetWriterInput.readyForMoreMediaData)
{
printf("appending %d attemp %d\n", frameCount, j);

CMTime frameTime = CMTimeMake(frameCount,(int32_t) kRecordingFPS);
append_ok = [adaptor appendPixelBuffer:buffer withPresentationTime:frameTime];

if(buffer)
CVBufferRelease(buffer);
[NSThread sleepForTimeInterval:0.05];
}
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", frameCount, j);
}
frameCount++;
}


//Finish the session:
[videoWriterInput markAsFinished];
[videoWriter finishWriting];
NSLog(@"Write Ended");
[videoWriterInput release];
[videoWriter release];
[imageArray release];
}

它第一次工作,但如果我运行代码 2.3 次或更多次,它报道:

!appending 0 0-0 attemp 0
!appending 0 0-0 attemp 1
My App(11385,0xb0103000) malloc: *** error for object 0x9ab4270: double free
*** set a breakpoint in malloc_error_break to debug
!appending 0 0-0 attemp 2
My App(11385,0xb0103000) malloc: *** error for object 0x9ab4270: double free
*** set a breakpoint in malloc_error_break to debug
!appending 0 0-0 attemp 3

有时会导致崩溃

我试图找到原因,但没有结果,

欢迎您的评论

最佳答案

而不是使用 [NSThread sleepForTimeInterval:0.1];利用同时(!adaptor.assetWriterInput.readyForMoreMediaData){}

因为很多时候 readyForMoreMediaData 从未在 0.1 时间间隔内设置为 YES。

同时尝试释放被 appendPixelBuffer:withPresentationTime: 方法占用的内存实际上这个方法会阻止你成功运行

关于iphone - AVAssetWriterInputPixelBufferAdaptor appendPixelBuffer,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/13523535/

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