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MATLAB function open works in workspace, but not in function

I am trying to create a video file with MATLAB. Here is my function:

function [vidObj] = createVideo(frames, frameRate, filename)

%Create video object
num_frames = size(frames,2);
vidObj = VideoWriter(filename);
vidObj.Quality = 100;
vidObj = frameRate;
open(vidObj);

%some more stuff...

The issue is that MATLAB always gives me an error at the call to open(vidObj) saying 

Error using open (line 69)
NAME must contain a single string.

My string is simple...just 'test_video.avi'. But it's not working. I also tried going in the function and replacing 'filename' with literal strings.

What is strange is that when I just type the commands into the command window, it works fine. Why? And how can I make this work in the function?

Solution

  • It looks like you may be overwriting your video object, vidObj, with the line vidObj = frameRate;.

    Try replacing with vidObj.FrameRate = frameRate;.