C++ : What's the easiest library to open video file

I would like to open a small video file and map every frames in memory (to apply some custom filter). I don't want to handle the video codec, I would rather let the library handle that for me.

I've tried to use Direct Show with the SampleGrabber filter (using this sample http://msdn.microsoft.com/en-us/library/ms787867(VS.85).aspx), but I only managed to grab some frames (not every frames!). I'm quite new in video software programming, maybe I'm not using the best library, or I'm doing it wrong.

I've pasted a part of my code (mainly a modified copy/paste from the msdn example), unfortunately it doesn't grabb the 25 first frames as expected...

[...]

hr = pGrabber->SetOneShot(TRUE);
hr = pGrabber->SetBufferSamples(TRUE);

pControl->Run(); // Run the graph.
pEvent->WaitForCompletion(INFINITE, &evCode); // Wait till it's done.

// Find the required buffer size.
long cbBuffer = 0;
hr = pGrabber->GetCurrentBuffer(&cbBuffer, NULL);

for( int i = 0 ; i < 25 ; ++i )
{
    pControl->Run(); // Run the graph.
    pEvent->WaitForCompletion(INFINITE, &evCode); // Wait till it's done.

    char *pBuffer = new char[cbBuffer];
    hr = pGrabber->GetCurrentBuffer(&cbBuffer, (long*)pBuffer);

    AM_MEDIA_TYPE mt;
    hr = pGrabber->GetConnectedMediaType(&mt);
    VIDEOINFOHEADER *pVih;
    pVih = (VIDEOINFOHEADER*)mt.pbFormat;

    [...]
}

[...]

Is there somebody, with video software experience, who can advise me about code or other simpler library?

Thanks

Edit: Msdn links seems not to work (see the bug)