Error running VideoWriter in R2022b

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Colin 2023-3-12

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https://ww2.mathworks.cn/matlabcentral/answers/1927455-error-running-videowriter-in-r2022b

编辑： Colin 2023-3-13

采纳的回答： Colin

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I am not able to create a basic VideoWriter object as described in the documentation, for example:

video = VideoWriter('newfile.avi');

returns "Not enough input arguments."

as does

video = VideoWriter('newfile.avi','Motion JPEG AVI');

However, adding a sample third argument:

v = VideoWriter('newfile.avi','Motion JPEG AVI','test');

returns

Error using VideoWriter: Too many input arguments.

Has anyone else experienced this or know of what the problem might be?

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Walter Roberson 2023-3-13

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When you call

video = VideoWriter('newfile.avi');

then the only time that you can get a message such as

error using VideoWriter

Not enough input arguments.

with no further message, is the case where you are invoking a built-in (pre-compiled) function -- but we can see from the results of which that a regular function is being invoked.

When a regular function is invoked, you get messages such as

Not enough input arguments.

Error in bwmorph (line 90)

validateattributes(bwin,{'numeric' 'logical'},{'real' 'nonsparse' '2d'}, ...

Notice the traceback showing the line of code inside bwmorph in which the problem was detected. The details of the line number and the text of the line can help a lot in tracking down what the problem is.

(Note: this is a different situation than the case in which a function is being called with too many input arguments. When too many input arguments are used, then depending how the function is coded, MATLAB might be able to detect the problem before running the function at all. But in the case of too few input arguments, MATLAB needs to run the function, as the function might be able to handle the situation where not all parameters were passed in.)

Walter Roberson 2023-3-13

The problem is that you have a third party erase.m in your path

Colin 2023-3-13

This is exactly it -- I had a climate-model (WRF) set of files that included an erase.m script, and removing it from the path made VideoWriter happy. Will add this as an answer. Thank you!

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采纳的回答

Colin 2023-3-13

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https://ww2.mathworks.cn/matlabcentral/answers/1927455-error-running-videowriter-in-r2022b#answer_1192235

编辑：Colin 2023-3-13

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It turns out that I had a third-party erase.m script in my Matlab path which was interfering with the built-in erase function and making one of VideoWriter's subscripts unhappy. Searching in my filesystem for this erase.m and then calling

rmpath(location/of/third/party/erase.m)

made VideoWriter work again as expected. (h/t Walter Roberson)