movie2avi axis label display

Dear, I made a movie file by movie2avi as follows

figure(8)
axis tight

for ii = 1:Nt/2-10
    plot(x, ex_sol(:, ii))
    xlabel('x'); ylabel('u_exact(x, t)')
    M(ii) = getframe;
end
movie2avi(M, 'mov.avi', 'compression', 'None', 'fps', 5)

However, it did not display the axis labels. Then, how can I do to do that?

Thank you, Park