Glazunov is an excellent guess! I remember playing a student quartet by him when I was a student, and it totally had that modal parallel melodic/harmonic movement in 4ths and 5ths. It is so Dvorak though, minus his noodly viola jamz under the melody. Hint of Ravel, but not French enough- maybe Chopin too. Will be thinking on it this week. I'd like to hear the whole piece too now!Update: I just watched the first few seconds of your clip- and that is the exact piece I played as a student that reminded me of it as I mentioned above. Listening now.