AVAssetWriter memory error - ios

Question

I have few methods that are supposed to write video in mov file to temp dir, but after ~15 sec. I'm getting errors:
Received memory warning.
Received memory warning.
Received memory warning.
Received memory warning.
Then app is crashing. I'm stuck and have no idea what is wrong...
- (void) saveVideoToFileFromBuffer:(CMSampleBufferRef) buffer {
if (!movieWriter) {
NSString *moviePath = [NSString stringWithFormat:#"%#tmpMovie", NSTemporaryDirectory()];
if ([[NSFileManager defaultManager] fileExistsAtPath:moviePath])
[self removeMovieAtPath:moviePath];
NSError *error = nil;
movieWriter = [[AVAssetWriter alloc] initWithURL:[NSURL fileURLWithPath:moviePath] fileType: AVFileTypeQuickTimeMovie error:&error];
if (error) {
m_log(#"Error allocating AssetWriter: %#", [error localizedDescription]);
} else {
CMFormatDescriptionRef description = CMSampleBufferGetFormatDescription(buffer);
if(![self setUpMovieWriterObjectWithDescriptor:description])
m_log(#"ET go home, no video recording!!");
}
}
if (movieWriter.status != AVAssetWriterStatusWriting) {
[movieWriter startWriting];
[movieWriter startSessionAtSourceTime:kCMTimeZero];
apiStatusChangeIndicator = NO;
}
if (movieWriter.status == AVAssetWriterStatusWriting) {
if (![movieInput appendSampleBuffer:buffer]) m_log(#"Failed to append sample buffer!");
}
}
Rest of code:
- (BOOL) setUpMovieWriterObjectWithDescriptor:(CMFormatDescriptionRef) descriptor {
CMVideoDimensions dimensions = CMVideoFormatDescriptionGetDimensions(descriptor);
NSDictionary *compressionSettings = [NSDictionary dictionaryWithObjectsAndKeys: AVVideoProfileLevelH264Baseline31,AVVideoProfileLevelKey,
[NSNumber numberWithInteger:30], AVVideoMaxKeyFrameIntervalKey, nil];
//AVVideoProfileLevelKey set because of errors
NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:AVVideoCodecH264, AVVideoCodecKey,[NSNumber numberWithInt:dimensions.width], AVVideoWidthKey,
[NSNumber numberWithInt:dimensions.height], AVVideoHeightKey, compressionSettings, AVVideoCompressionPropertiesKey, nil];
if ([movieWriter canApplyOutputSettings:videoSettings forMediaType:AVMediaTypeVideo]) {
movieInput = [[AVAssetWriterInput alloc] initWithMediaType:AVMediaTypeVideo outputSettings:videoSettings];
movieInput.expectsMediaDataInRealTime = YES;
if ([movieWriter canAddInput:movieInput]) {
[movieWriter addInput:movieInput];
} else {
m_log(#"Couldn't apply video input to Asset Writer!");
return NO;
}
} else {
m_log(#"Couldn't apply video settings to AVAssetWriter!");
return NO;
}
return YES;
}
Would be great if someone could point my mistake! Can share more code if needed. SampleBuffer comes from CIImage with filters.
Now new thing, I can record few seconds of movie and saved it, but it's all black screen...
UPDATE
Saving video works, but creating CMSampleBufferRef from CIImage fails. It's reason that I got green or black screen, here's the code:
- (CMSampleBufferRef) processCIImageToPixelBuffer:(CIImage*) image andSampleBuffer:(CMSampleTimingInfo) info{
CVPixelBufferRef renderTargetPixelBuffer;
CFDictionaryRef empty;
CFMutableDictionaryRef attrs;
empty = CFDictionaryCreate(kCFAllocatorDefault,
NULL,
NULL,
0,
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
attrs = CFDictionaryCreateMutable(kCFAllocatorDefault,
1,
&kCFTypeDictionaryKeyCallBacks,
&kCFTypeDictionaryValueCallBacks);
CFDictionarySetValue(attrs,
kCVPixelBufferIOSurfacePropertiesKey,
empty);
CVReturn cvError = CVPixelBufferCreate(kCFAllocatorSystemDefault,
[image extent].size.width,
[image extent].size.height,
kCVPixelFormatType_420YpCbCr8BiPlanarFullRange,
attrs,
&renderTargetPixelBuffer);
if (cvError != 0) {
m_log(#"Error when init Pixel buffer: %i", cvError);
}
CFRelease(empty);
CFRelease(attrs);
CVPixelBufferLockBaseAddress(renderTargetPixelBuffer, 0 );
[_coreImageContext render:image toCVPixelBuffer:renderTargetPixelBuffer];
CVPixelBufferUnlockBaseAddress(renderTargetPixelBuffer, 0 );
CMVideoFormatDescriptionRef videoInfo = NULL;
CMVideoFormatDescriptionCreateForImageBuffer(kCFAllocatorDefault, renderTargetPixelBuffer, &videoInfo);
CMSampleBufferRef recordingBuffer;
OSStatus cmError = CMSampleBufferCreateForImageBuffer(kCFAllocatorDefault, renderTargetPixelBuffer, true, NULL, NULL, videoInfo, &info, &recordingBuffer);
if (cmError != 0 ) {
m_log(#"Error creating sample buffer: %i", (int)cmError);
}
CVPixelBufferRelease(renderTargetPixelBuffer);
renderTargetPixelBuffer = NULL;
CFRelease(videoInfo);
videoInfo = NULL;
return recordingBuffer;
}

Answer 1

You should check your code with Profile tool. Especially for memory leaks. May be you do not release sample buffer:
CMSampleBufferInvalidate(buffer);
CFRelease(buffer);
buffer = NULL;