[ITK Community] VideoFileReader: segmentation fault

[Matt McCormick]

Hi Matteo,

Could you please share a small, complete, buildable example of your code?

Thanks,
Matt


On Fri, Mar 7, 2014 at 8:57 AM, Matteo Pozza <matteo.pozza at studenti.unipd.it
> wrote:

> Hi Matt,
>
> I tried to run GNU Debugger and this is the result
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x0000000000471002 in
> itk::VideoFileReader<itk::VideoStream<itk::Image<itk::RGBPixel<unsigned
> char>, 2u> > >::InitializeVideoIO (this=0xe18800)
>     at /usr/local/include/ITK-4.5/itkVideoFileReader.hxx:252
> 252      m_VideoIO->SetFileName(m_FileName.c_str());
>
> It seems that there is some problems with the file path but I'm pretty
> sure that the path I pass is correct. I've tried also to fix a path with a
> std::string and then convert it with c_str() function passing it to
> reader->SetFileName() but the error is the same.
>
> Thank you for your help.
>
>
>
> 2014-03-07 10:11 GMT+01:00 Matt McCormick <matt.mccormick at kitware.com>:
>
> Hi Matteo,
>>
>> What is the file:line number?
>>
>> Thanks,
>> Matt
>>
>> PS.  Please keep replies on the list so all can benefit.
>>
>>
>> On Fri, Mar 7, 2014 at 4:07 AM, Matteo Pozza <
>> matteo.pozza at studenti.unipd.it> wrote:
>>
>>> Dear Matt,
>>>
>>> I'm trying to use QtDebugger: it says that the segmentation fault is in
>>> the nested call
>>>
>>> itk::VideoFileReader<itk::VideoStream<itk::Image<itk::RGBPixel<unsigned
>>> char>, 2u> > >::InitializeVideoIO()
>>>
>>>
>>> 2014-03-07 9:46 GMT+01:00 Matteo Pozza <matteo.pozza at studenti.unipd.it>:
>>>
>>> Dear Matt,
>>>>
>>>> I'll try immediately what you suggest to me, but perhaps I'm using this
>>>> class with the wrong purpose: can I read with this class .mpeg and .avi
>>>> video formats? Otherwise, which formats can I read with this class?
>>>>
>>>> Thanks
>>>>
>>>>
>>>> 2014-03-07 9:40 GMT+01:00 Matt McCormick <matt.mccormick at kitware.com>:
>>>>
>>>> Hi Matteo,
>>>>>
>>>>> What does the stack trace show?  Try setting CMAKE_BUILD_TYPE to
>>>>> Debug, and use GDB or a GDB-based graphical debugger.
>>>>>
>>>>> Thanks,
>>>>> Matt
>>>>>
>>>>>
>>>>> On Fri, Mar 7, 2014 at 3:14 AM, Matteo Pozza <
>>>>> matteo.pozza at studenti.unipd.it> wrote:
>>>>>
>>>>>> Dear Matt,
>>>>>> thank you for answering!
>>>>>> I already call the reader->Update() in a try/catch block like this one
>>>>>>
>>>>>> // code above
>>>>>> try {
>>>>>>         cout << "Control point 1\n";
>>>>>>         reader->Update();
>>>>>>         cout << "Control point 2\n";
>>>>>>     }
>>>>>>     catch (itk::ExceptionObject & e) {
>>>>>>         std::cerr << "exception in file reader " << std::endl;
>>>>>>         std::cerr << e << std::endl;
>>>>>>         return EXIT_FAILURE;
>>>>>>     }
>>>>>> // code below
>>>>>>
>>>>>> The output of this piece of code is:
>>>>>>
>>>>>> Control point 1
>>>>>> Segmentation fault (core dumped)
>>>>>>
>>>>>>
>>>>>> 2014-03-07 8:34 GMT+01:00 Matt McCormick <matt.mccormick at kitware.com>
>>>>>> :
>>>>>>
>>>>>> Hi Matteo,
>>>>>>>
>>>>>>> Is the reader->Update() call in a try-catch block [1]?
>>>>>>>
>>>>>>> Thanks,
>>>>>>> Matt
>>>>>>>
>>>>>>> [1]
>>>>>>> http://itk.org/ITKExamples/src/Core/Common/TryCatchException/Documentation.html
>>>>>>>
>>>>>>>
>>>>>>> On Thu, Mar 6, 2014 at 12:06 PM, Matteo Pozza <
>>>>>>> matteo.pozza at studenti.unipd.it> wrote:
>>>>>>>
>>>>>>>> Hi everyone,
>>>>>>>> I'm trying to read a video with ITK: I want to get every single
>>>>>>>> frame for compute some features. I'm trying to use the code below
>>>>>>>>
>>>>>>>> typedef itk::RGBPixel<unsigned char> RGBPixelType;
>>>>>>>> typedef itk::Image< RGBPixelType, 2 > InputImageType;
>>>>>>>> typedef itk::VideoStream<
>>>>>>>> InputImageType> VideoStream;
>>>>>>>> typedef itk::VideoFileReader<VideoStream> ReaderType;
>>>>>>>> ReaderType::Pointer reader = ReaderType::New();
>>>>>>>> reader->SetFileName( name );
>>>>>>>> reader->Update();
>>>>>>>> VideoStream::Pointer video = reader->GetOutput();
>>>>>>>> VideoStream::FramePointer singleFrame = video->GetFrame(0);
>>>>>>>>
>>>>>>>> but reader->Update() gives me segmentation fault runtime error.
>>>>>>>> I've already checked that the filename passed to the reader is consistent,
>>>>>>>> so the error is really strange.
>>>>>>>> I've looked for some examples but I've haven't found so much, so is
>>>>>>>> likely that my code is somewhere wrong: I've also found that before
>>>>>>>> instantiating the reader is appropriate to put
>>>>>>>>
>>>>>>>> itk::ObjectFactoryBase::RegisterFactory(
>>>>>>>> itk::FileListVideoIOFactory::New() );
>>>>>>>>
>>>>>>>> but also with this line of code the error is the same at the same
>>>>>>>> point.
>>>>>>>>
>>>>>>>> I ask you to guide me to a correct use of these classes or to give
>>>>>>>> me some advices about this problem: anyway, thank you for the attention!
>>>>>>>>
>>>>>>>> Matteo
>>>>>>>>
>>>>>>>> _______________________________________________
>>>>>>>> Community mailing list
>>>>>>>> Community at itk.org
>>>>>>>> http://public.kitware.com/cgi-bin/mailman/listinfo/community
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>
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