Why is MagicalTrevor so Magical? :)

Hi,
I've read the documentation on MagicalTrevor, but I do not understand really what it is used for. In my case, I'm trying to get video working in the fxVideoRenderObject using the areTorquePopular.ogg file. It renders correctly, but half-way during playback, it gets very choppy and the console outputs "MagicalTrevor::advancetime - no last occurrence for buffer found". It eventually just stops playing. I investigated the code and I tried simply commenting out the call to MagicalTrevor:advanceTime:

F64 TheoraTexture::getTheoraTime()
{
   //if(mHasVorbis)
   //{
   //   // We have audio, so synch to audio track.
   //   ALint buf=-1;
   //   alGetSourcei(mVorbisBuffer->mSource, AL_BUFFER, &buf);
   //   mCurrentTime += mMagicalTrevor.advanceTime(buf);
   //   return mCurrentTime;
   //}
   //else
   {
      // We have no audio, just synch to start time.
      return (double)0.001 * (double)(Platform::getRealMilliseconds() - mStartTick);
   }
}

and I get much better performance, and the audio/video is in sync. I guess the choppiness in the original code occurs because of the tight loop inside of advanceTime. Anyways, I just want to understand the logic behind MagicalTrevor. Is it so that if we had more than 1 video playing, MagicalTrevor is used for some organization of the buffers? I don't fully understand it (after all, it's magical :). Any help would be greatly appreciated.

thanks