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didDropSampleBuffer is called very often in iOS
How to set the AVCaptureVideoDataOutput in a libraryAVCaptureVideoDataOutput issue in IOS 5How to get Picture frames by frames in XcodeAVAssetWriter error when AVCaptureSession camera input is changedHow to call Objective-C code from SwiftiOS / iPhone - Silent switch not working after adding AVCaptureAudioDataOutput to AVCaptureSessionMemory Leak in CMSampleBufferGetImageBufferCIContext + createCGImage + UIImage CrashiOS camera facetracking (Swift 3 Xcode 8)Simple CIFilter Passthru with CGImage conversion returns black pixels
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I capture the video and do some analyses on it in captureOutput:(AVCaptureOutput *)output didOutputSampleBuffer delegate. but after a short time this method is not called. then captureOutput:(AVCaptureOutput *)output didDropSampleBuffer delegate is called.
When I don't do anything in didOutputSampleBuffer, everything is okay.
I run a tensor flow model in this delegate. And this causes the problem.
Problem:
The problem is that when didDropSampleBuffer is called, didOutputSampleBuffer will not called again.
My solution:
My solution was stoping and starting avCaptureSession. but that caused extra memory usage! Which finally caused my app to crash.
- (void)captureOutput:(AVCaptureOutput *)output didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection
// ****** do heavy work in this delegate *********
graph = [TensorflowGraph new];
predictions = [graph runModelOnPixelBuffer:pixelBuffer orientation: UIDeviceOrientationPortrait CardRect: _vwRect];
- (void)captureOutput:(AVCaptureOutput *)output didDropSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection
CFTypeRef droppedFrameReason = CMGetAttachment(sampleBuffer, kCMSampleBufferAttachmentKey_DroppedFrameReason, NULL);
NSLog(@"dropped frame, reason: %@", droppedFrameReason);
----> dropped frame, reason: OutOfBuffers
According to [https://developer.apple.com/library/archive/technotes/tn2445/_index.html]:
This condition is typically caused by the client holding onto buffers
for too long, and can be alleviated by returning buffers to the
provider.
How can I return buffer to the provider?
Edited
After 11 times that CGImageRef cgImage = [context createCGImage:resized fromRect:resized.extent]; line is executed, The didDropSampleBuffer is called. commenting CFRelease(pixelBuffer) has no difference in result. Does it means that pixelBuffer is not released?
CFRetain(pixelBuffer);
CVPixelBufferLockBaseAddress(pixelBuffer, kCVPixelBufferLock_ReadOnly);
CIImage* ciImage = [[CIImage alloc] initWithCVPixelBuffer:pixelBuffer];
ciImage = [ciImage imageByCroppingToRect:cropRect];
CGAffineTransform transform = CGAffineTransformIdentity;
CGFloat angle = 0.0;
transform = CGAffineTransformRotate(transform, angle);
CIImage* resized = [ciImage imageByApplyingTransform:transform];
CIContext *context = [CIContext contextWithOptions:nil];
CGImageRef cgImage = [context createCGImage:resized fromRect:resized.extent]; // *********************************
UIImage* _res = [[UIImage alloc] initWithCGImage:cgImage];
CFRelease(pixelBuffer);
1
ios objective-c tensorflow
asked Mar 26 at 11:31
Fattaneh TalebiFattaneh Talebi
4128 silver badges28 bronze badges
|
show 1 more comment
I capture the video and do some analyses on it in captureOutput:(AVCaptureOutput *)output didOutputSampleBuffer delegate. but after a short time this method is not called. then captureOutput:(AVCaptureOutput *)output didDropSampleBuffer delegate is called.
When I don't do anything in didOutputSampleBuffer, everything is okay.
I run a tensor flow model in this delegate. And this causes the problem.
Problem:
The problem is that when didDropSampleBuffer is called, didOutputSampleBuffer will not called again.
My solution:
My solution was stoping and starting avCaptureSession. but that caused extra memory usage! Which finally caused my app to crash.
- (void)captureOutput:(AVCaptureOutput *)output didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection
// ****** do heavy work in this delegate *********
graph = [TensorflowGraph new];
predictions = [graph runModelOnPixelBuffer:pixelBuffer orientation: UIDeviceOrientationPortrait CardRect: _vwRect];
- (void)captureOutput:(AVCaptureOutput *)output didDropSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection
CFTypeRef droppedFrameReason = CMGetAttachment(sampleBuffer, kCMSampleBufferAttachmentKey_DroppedFrameReason, NULL);
NSLog(@"dropped frame, reason: %@", droppedFrameReason);
----> dropped frame, reason: OutOfBuffers
According to [https://developer.apple.com/library/archive/technotes/tn2445/_index.html]:
This condition is typically caused by the client holding onto buffers
for too long, and can be alleviated by returning buffers to the
provider.
How can I return buffer to the provider?
Edited
After 11 times that CGImageRef cgImage = [context createCGImage:resized fromRect:resized.extent]; line is executed, The didDropSampleBuffer is called. commenting CFRelease(pixelBuffer) has no difference in result. Does it means that pixelBuffer is not released?
CFRetain(pixelBuffer);
CVPixelBufferLockBaseAddress(pixelBuffer, kCVPixelBufferLock_ReadOnly);
CIImage* ciImage = [[CIImage alloc] initWithCVPixelBuffer:pixelBuffer];
ciImage = [ciImage imageByCroppingToRect:cropRect];
CGAffineTransform transform = CGAffineTransformIdentity;
CGFloat angle = 0.0;
transform = CGAffineTransformRotate(transform, angle);
CIImage* resized = [ciImage imageByApplyingTransform:transform];
CIContext *context = [CIContext contextWithOptions:nil];
CGImageRef cgImage = [context createCGImage:resized fromRect:resized.extent]; // *********************************
UIImage* _res = [[UIImage alloc] initWithCGImage:cgImage];
CFRelease(pixelBuffer);
1
ios objective-c tensorflow
asked Mar 26 at 11:31
Fattaneh TalebiFattaneh Talebi
4128 silver badges28 bronze badges
This may sound like a redundant question, but what do you expect to happen? From my point of view, this is what would happen if the didOutputSampleBuffer-method cannot keep up with the camera framerate.
– Mats
Mar 26 at 11:50
1
Something you are doing is likely callingCFRetainonsampleBufferbut not releasing it. When the capture pipeline runs out of buffers because they're all retained, it stops outputting. This is a memory leak. But you'll probably need to show more code to identify the problem and ensure your existing code snippets are accurate.
– allenh
Apr 2 at 12:01
@allenh Thanks. I updated the question.
– Fattaneh Talebi
Apr 4 at 9:31
1
You can check the retain count of your pixel buffer usingCFGetRetainCount. It should be 1 when your delegate returns.[CIImage initWithCVPixelBuffer:actually retains the pixel buffer, so if you're keeping the image around anywhere, that can cause problems. Additionally, I have no clue what[TensorflowGraph runModelOnPixelBuffer:orientation:CardRect:]does to the pixel buffer. You also need to be callingCVPixelBufferUnlockBaseAddressbeforeCFRelease.
– allenh
Apr 4 at 13:44
@allenh Thanks. It was a really good comment. After [ciimage initWithCvPixelBuffer] how should I release pixel buffer? Should I do something or it will be released automatically?
– Fattaneh Talebi
Apr 5 at 10:40
|
show 1 more comment
I capture the video and do some analyses on it in captureOutput:(AVCaptureOutput *)output didOutputSampleBuffer delegate. but after a short time this method is not called. then captureOutput:(AVCaptureOutput *)output didDropSampleBuffer delegate is called.
When I don't do anything in didOutputSampleBuffer, everything is okay.
I run a tensor flow model in this delegate. And this causes the problem.
Problem:
The problem is that when didDropSampleBuffer is called, didOutputSampleBuffer will not called again.
My solution:
My solution was stoping and starting avCaptureSession. but that caused extra memory usage! Which finally caused my app to crash.
- (void)captureOutput:(AVCaptureOutput *)output didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection
// ****** do heavy work in this delegate *********
graph = [TensorflowGraph new];
predictions = [graph runModelOnPixelBuffer:pixelBuffer orientation: UIDeviceOrientationPortrait CardRect: _vwRect];
- (void)captureOutput:(AVCaptureOutput *)output didDropSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection
CFTypeRef droppedFrameReason = CMGetAttachment(sampleBuffer, kCMSampleBufferAttachmentKey_DroppedFrameReason, NULL);
NSLog(@"dropped frame, reason: %@", droppedFrameReason);
----> dropped frame, reason: OutOfBuffers
According to [https://developer.apple.com/library/archive/technotes/tn2445/_index.html]:
This condition is typically caused by the client holding onto buffers
for too long, and can be alleviated by returning buffers to the
provider.
How can I return buffer to the provider?
Edited
After 11 times that CGImageRef cgImage = [context createCGImage:resized fromRect:resized.extent]; line is executed, The didDropSampleBuffer is called. commenting CFRelease(pixelBuffer) has no difference in result. Does it means that pixelBuffer is not released?
CFRetain(pixelBuffer);
CVPixelBufferLockBaseAddress(pixelBuffer, kCVPixelBufferLock_ReadOnly);
CIImage* ciImage = [[CIImage alloc] initWithCVPixelBuffer:pixelBuffer];
ciImage = [ciImage imageByCroppingToRect:cropRect];
CGAffineTransform transform = CGAffineTransformIdentity;
CGFloat angle = 0.0;
transform = CGAffineTransformRotate(transform, angle);
CIImage* resized = [ciImage imageByApplyingTransform:transform];
CIContext *context = [CIContext contextWithOptions:nil];
CGImageRef cgImage = [context createCGImage:resized fromRect:resized.extent]; // *********************************
UIImage* _res = [[UIImage alloc] initWithCGImage:cgImage];
CFRelease(pixelBuffer);
1
ios objective-c tensorflow
asked Mar 26 at 11:31
Fattaneh TalebiFattaneh Talebi
4128 silver badges28 bronze badges
I capture the video and do some analyses on it in captureOutput:(AVCaptureOutput *)output didOutputSampleBuffer delegate. but after a short time this method is not called. then captureOutput:(AVCaptureOutput *)output didDropSampleBuffer delegate is called.
When I don't do anything in didOutputSampleBuffer, everything is okay.
I run a tensor flow model in this delegate. And this causes the problem.
Problem:
The problem is that when didDropSampleBuffer is called, didOutputSampleBuffer will not called again.
My solution:
My solution was stoping and starting avCaptureSession. but that caused extra memory usage! Which finally caused my app to crash.
- (void)captureOutput:(AVCaptureOutput *)output didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection
// ****** do heavy work in this delegate *********
graph = [TensorflowGraph new];
predictions = [graph runModelOnPixelBuffer:pixelBuffer orientation: UIDeviceOrientationPortrait CardRect: _vwRect];
- (void)captureOutput:(AVCaptureOutput *)output didDropSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection
CFTypeRef droppedFrameReason = CMGetAttachment(sampleBuffer, kCMSampleBufferAttachmentKey_DroppedFrameReason, NULL);
NSLog(@"dropped frame, reason: %@", droppedFrameReason);
----> dropped frame, reason: OutOfBuffers
According to [https://developer.apple.com/library/archive/technotes/tn2445/_index.html]:
This condition is typically caused by the client holding onto buffers
for too long, and can be alleviated by returning buffers to the
provider.
How can I return buffer to the provider?
Edited
After 11 times that CGImageRef cgImage = [context createCGImage:resized fromRect:resized.extent]; line is executed, The didDropSampleBuffer is called. commenting CFRelease(pixelBuffer) has no difference in result. Does it means that pixelBuffer is not released?
CFRetain(pixelBuffer);
CVPixelBufferLockBaseAddress(pixelBuffer, kCVPixelBufferLock_ReadOnly);
CIImage* ciImage = [[CIImage alloc] initWithCVPixelBuffer:pixelBuffer];
ciImage = [ciImage imageByCroppingToRect:cropRect];
CGAffineTransform transform = CGAffineTransformIdentity;
CGFloat angle = 0.0;
transform = CGAffineTransformRotate(transform, angle);
CIImage* resized = [ciImage imageByApplyingTransform:transform];
CIContext *context = [CIContext contextWithOptions:nil];
CGImageRef cgImage = [context createCGImage:resized fromRect:resized.extent]; // *********************************
UIImage* _res = [[UIImage alloc] initWithCGImage:cgImage];
CFRelease(pixelBuffer);
1
ios objective-c tensorflow
ios objective-c tensorflow
asked Mar 26 at 11:31
Fattaneh TalebiFattaneh Talebi
4128 silver badges28 bronze badges
asked Mar 26 at 11:31
Fattaneh TalebiFattaneh Talebi
4128 silver badges28 bronze badges
edited Apr 4 at 9:37
Fattaneh Talebi
asked Mar 26 at 11:31
Fattaneh TalebiFattaneh Talebi
4128 silver badges28 bronze badges
asked Mar 26 at 11:31
Fattaneh TalebiFattaneh Talebi
4128 silver badges28 bronze badges
asked Mar 26 at 11:31
Fattaneh TalebiFattaneh Talebi
4128 silver badges28 bronze badges
4128 silver badges28 bronze badges
This may sound like a redundant question, but what do you expect to happen? From my point of view, this is what would happen if the didOutputSampleBuffer-method cannot keep up with the camera framerate.
– Mats
Mar 26 at 11:50
1
Something you are doing is likely callingCFRetainonsampleBufferbut not releasing it. When the capture pipeline runs out of buffers because they're all retained, it stops outputting. This is a memory leak. But you'll probably need to show more code to identify the problem and ensure your existing code snippets are accurate.
– allenh
Apr 2 at 12:01
@allenh Thanks. I updated the question.
– Fattaneh Talebi
Apr 4 at 9:31
1
You can check the retain count of your pixel buffer usingCFGetRetainCount. It should be 1 when your delegate returns.[CIImage initWithCVPixelBuffer:actually retains the pixel buffer, so if you're keeping the image around anywhere, that can cause problems. Additionally, I have no clue what[TensorflowGraph runModelOnPixelBuffer:orientation:CardRect:]does to the pixel buffer. You also need to be callingCVPixelBufferUnlockBaseAddressbeforeCFRelease.
– allenh
Apr 4 at 13:44
@allenh Thanks. It was a really good comment. After [ciimage initWithCvPixelBuffer] how should I release pixel buffer? Should I do something or it will be released automatically?
– Fattaneh Talebi
Apr 5 at 10:40
|
show 1 more comment
This may sound like a redundant question, but what do you expect to happen? From my point of view, this is what would happen if the didOutputSampleBuffer-method cannot keep up with the camera framerate.
– Mats
Mar 26 at 11:50
1
Something you are doing is likely callingCFRetainonsampleBufferbut not releasing it. When the capture pipeline runs out of buffers because they're all retained, it stops outputting. This is a memory leak. But you'll probably need to show more code to identify the problem and ensure your existing code snippets are accurate.
– allenh
Apr 2 at 12:01
@allenh Thanks. I updated the question.
– Fattaneh Talebi
Apr 4 at 9:31
1
You can check the retain count of your pixel buffer usingCFGetRetainCount. It should be 1 when your delegate returns.[CIImage initWithCVPixelBuffer:actually retains the pixel buffer, so if you're keeping the image around anywhere, that can cause problems. Additionally, I have no clue what[TensorflowGraph runModelOnPixelBuffer:orientation:CardRect:]does to the pixel buffer. You also need to be callingCVPixelBufferUnlockBaseAddressbeforeCFRelease.
– allenh
Apr 4 at 13:44
@allenh Thanks. It was a really good comment. After [ciimage initWithCvPixelBuffer] how should I release pixel buffer? Should I do something or it will be released automatically?
– Fattaneh Talebi
Apr 5 at 10:40
This may sound like a redundant question, but what do you expect to happen? From my point of view, this is what would happen if the didOutputSampleBuffer-method cannot keep up with the camera framerate.
– Mats
Mar 26 at 11:50
This may sound like a redundant question, but what do you expect to happen? From my point of view, this is what would happen if the didOutputSampleBuffer-method cannot keep up with the camera framerate.
– Mats
Mar 26 at 11:50
1
1
Something you are doing is likely calling
CFRetain on sampleBuffer but not releasing it. When the capture pipeline runs out of buffers because they're all retained, it stops outputting. This is a memory leak. But you'll probably need to show more code to identify the problem and ensure your existing code snippets are accurate.– allenh
Apr 2 at 12:01
Something you are doing is likely calling
CFRetain on sampleBuffer but not releasing it. When the capture pipeline runs out of buffers because they're all retained, it stops outputting. This is a memory leak. But you'll probably need to show more code to identify the problem and ensure your existing code snippets are accurate.– allenh
Apr 2 at 12:01
@allenh Thanks. I updated the question.
– Fattaneh Talebi
Apr 4 at 9:31
@allenh Thanks. I updated the question.
– Fattaneh Talebi
Apr 4 at 9:31
1
1
You can check the retain count of your pixel buffer using
CFGetRetainCount. It should be 1 when your delegate returns. [CIImage initWithCVPixelBuffer: actually retains the pixel buffer, so if you're keeping the image around anywhere, that can cause problems. Additionally, I have no clue what [TensorflowGraph runModelOnPixelBuffer:orientation:CardRect:] does to the pixel buffer. You also need to be calling CVPixelBufferUnlockBaseAddress before CFRelease.– allenh
Apr 4 at 13:44
You can check the retain count of your pixel buffer using
CFGetRetainCount. It should be 1 when your delegate returns. [CIImage initWithCVPixelBuffer: actually retains the pixel buffer, so if you're keeping the image around anywhere, that can cause problems. Additionally, I have no clue what [TensorflowGraph runModelOnPixelBuffer:orientation:CardRect:] does to the pixel buffer. You also need to be calling CVPixelBufferUnlockBaseAddress before CFRelease.– allenh
Apr 4 at 13:44
@allenh Thanks. It was a really good comment. After [ciimage initWithCvPixelBuffer] how should I release pixel buffer? Should I do something or it will be released automatically?
– Fattaneh Talebi
Apr 5 at 10:40
@allenh Thanks. It was a really good comment. After [ciimage initWithCvPixelBuffer] how should I release pixel buffer? Should I do something or it will be released automatically?
– Fattaneh Talebi
Apr 5 at 10:40
|
show 1 more comment
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This may sound like a redundant question, but what do you expect to happen? From my point of view, this is what would happen if the didOutputSampleBuffer-method cannot keep up with the camera framerate.
– Mats
Mar 26 at 11:50
1
Something you are doing is likely calling
CFRetainonsampleBufferbut not releasing it. When the capture pipeline runs out of buffers because they're all retained, it stops outputting. This is a memory leak. But you'll probably need to show more code to identify the problem and ensure your existing code snippets are accurate.– allenh
Apr 2 at 12:01
@allenh Thanks. I updated the question.
– Fattaneh Talebi
Apr 4 at 9:31
1
You can check the retain count of your pixel buffer using
CFGetRetainCount. It should be 1 when your delegate returns.[CIImage initWithCVPixelBuffer:actually retains the pixel buffer, so if you're keeping the image around anywhere, that can cause problems. Additionally, I have no clue what[TensorflowGraph runModelOnPixelBuffer:orientation:CardRect:]does to the pixel buffer. You also need to be callingCVPixelBufferUnlockBaseAddressbeforeCFRelease.– allenh
Apr 4 at 13:44
@allenh Thanks. It was a really good comment. After [ciimage initWithCvPixelBuffer] how should I release pixel buffer? Should I do something or it will be released automatically?
– Fattaneh Talebi
Apr 5 at 10:40