[ITK Community] VideoFileReader: segmentation fault

[Matt McCormick]

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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