MATLAB: Create working avi video.

Image Processing Toolboxmatricesvideo

Always when I try to create an .avi video out of matrices I get the following error: Invalid video data – must be numeric or logical data type.
        function  = CreateVideo(obj)
            video = VideoWriter('test.avi');
            video.FrameRate = 1;
            open(video)
            % loop 2d matrix sequence with ones and zeros and create video
            for i_inc = 1 : size(obj.square_move_seq_, 3)
                gray_img = double(obj.square_move_seq_(:, :, i_inc));
                img = cat(3, gray_img, gray_img, gray_img);
                writeVideo(video, img);
            end
            % Finalize the video file.
            close(video);
        end
Does somebody have a clue what I do wrong?
Thank you very much in advance.

Best Answer

Try
writeVideo(video, uint8(img));
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