[Insight-users] Help with Video Stream

[Franck P. Vidal]

Hi Xiaoxiao,

examples run well as there is some filtering on the input stream.
If I do some filtering on the input stream, it kinda works as I get 3 frames that keep looping.



What I just did is as follows:
------------------------------------------------------------------------------------------------------------------------
	…. …. 
        // Cache some data
        m_total_frame_number = m_p_file_reader->GetNumberOfFrames();
        m_frames_per_second  = m_p_file_reader->GetFramesPerSecond();
        m_duration = double(m_total_frame_number) / double(m_frames_per_second);

        // Save the data
        m_p_stream_data = m_p_file_reader->GetOutput();
        if (m_p_stream_data->GetFrameBuffer())
        {
            m_p_stream_data->GetFrameBuffer()->SetNumberOfBuffers(m_total_frame_number);
        }

	m_p_current_frame = m_p_stream_data->GetFrame(m_current_frame);
------------------------------------------------------------------------------------------------------------------------


now m_p_current_frame is not null.
So it works, but is it the right approach for ITK?

Cheers,

Franck



On 17 May 2013, at 03:29, Xiaoxiao Liu <xiaoxiao.liu at kitware.com> wrote:

> Hi Franck,
> Are u able to run all the video related tests in ITK? I would first make sure the ITK tests can pass on your system to rule out potential third party lib compatibility problems.
> 
> 
> 
> 
> -
> 
> Sent from my iPad
> 
> On May 16, 2013, at 5:07 PM, "Franck P. Vidal" <franck.p.vidal at gmail.com> wrote:
> 
>> Hello,
>> 
>> I have some code to read an AVI file.
>> Get the  method GetFrame of the VideoStream returns NULL.
>> 
>> 
>> -------------------------------------------------------------------------------------
>>  typedef unsigned char PixelType;
>>  typedef itk::Image<PixelType, 2> FrameType;
>>  typedef itk::VideoStream<FrameType> VideoType;
>> 
>>  typename itk::VideoFileReader<VideoType>::Pointer m_p_file_reader;
>>  typename VideoType::Pointer m_p_stream_data;
>>  typename FrameType::Pointer m_p_current_frame;
>> 
>>   …    …    …
>> 
>>  try
>>  {
>>   // Set the current frame to be the first frame
>>   m_current_frame = 0;
>> 
>>      // Load the IO factory for video files
>>      itk::ObjectFactoryBase::RegisterFactory(itk::OpenCVVideoIOFactory::New());
>> 
>>   // Create the file reader
>>      m_p_file_reader = itk::VideoFileReader<VideoType>::New();
>> 
>>      // Set the file name
>>      m_p_file_reader->SetFileName(aFileName);
>> 
>>      // Load the file
>>      m_p_file_reader->Update();
>>      m_p_file_reader->UpdateOutputInformation();
>>      m_p_stream_data = m_p_file_reader->GetOutput();
>> 
>>      m_p_current_frame = m_p_stream_data->GetFrame(m_current_frame);
>> 
>>   …    …    …
>> 
>> 
>>  }
>>  catch (std::exception& e)
>>  {
>>       std::cerr << "WARNING: " << e.what() << std::endl;
>>      return (false);
>>  }
>> -------------------------------------------------------------------------------------
>> 
>> Any idea why 'm_p_current_frame' is always NULL???
>> 
>> Cheers,
>> 
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