Unrecognized property 'Colormap' for class 'VideoWriter'??

I'm trying to change some old code that used avifile(), to the new VideoWriter. Everything seems to work but one thing gives an error. According to the page https://www.mathworks.com/help/matlab/ref/videowriter.html , I should be able to use the a.Colormap variable to set a colormap, but my code gives this error:

Unrecognized property 'Colormap' for class 'VideoWriter'.

My code:

    cmap = colormap(hsv(8));
    aviobj=VideoWriter(filename)
    aviobj.Quality=95
    aviobj.Colormap=cmap
    open(aviobj)

it never gets to the open() - it throws a error; what am I missing??

[Stephen23]

@Michael Levin: please show the complete error message. This means all of the red text.

The documentation states that "The Colormap property only applies to objects used for writing indexed AVI files." Are you writing an indexed AVI file?

Answer 1

[Walter Roberson]

That functionality is new in R2017b.

Answer 2

[Michael Levin]

Sorry, I don't understand. I'm using R2018a; the documentation shows this exact usage - why is it not working for me, and how do I specify the colormap for videos in 2018a?