How do I stop sound skipping when buffering streaming MovieTextures?

I am trying to play videos with MovieTexture but I have a persistent and terrible problem. Whenever I stream a video to a MovieTexture and the video pauses to buffer the sound skips back a bit and plays that bit over and over again during the buffering rather than just pausing like happens when you watch a video on Youtube or whatever. The script I use to play the movie texture is really simple:

IEnumerator Start () {

      // Start download
      var www = new WWW(url);
     // Make sure the movie is ready to start before we start playing
      var movieTexture = www.movie;
      while (!movieTexture.isReadyToPlay)
      {
          yield return 0;
      }
     // Initialize texture to be 1:1 resolution
      renderer.material.mainTexture = movieTexture;
     // Assign clip to audio source
      // Sync playback with audio
      audio.clip = movieTexture.audioClip;
     // Play both movie & sound
      movieTexture.Play();
      audio.Play();

}

This happens in the Webplayer and the editor. I haven't tested other platforms. It makes MovieTexture useless for streaming videos with sound. I am surprised that Unity would release the system with this problem because it is such a fatal bug. I have tried a wide variety of source video formats downloaded from the web already in ogg format and also converted others to ogg using ffmpeg. All these videos have the same problem. I have been using libvorbis as my sound codec. Has anyone got around this problem or does anyone not have this problem at all? If so what codecs do you use? How do you create your ogg videos? Should I give up on MovieTexture? Are there any other movie players for Unity that anyone can recommend that work on Webplayer and do a better job?

Thanks