MATLAB: Does AVI logging not work for the Image Acqusition Toolbox 1.0 (R13.0.1+)

acqusitionaviavi.dllimageImage Acquisition Toolboxinvalidislogging

I am trying to use AVI file logging with the following code:

file = avifile('D:\imaq.avi');                                          
obj = videoinput('winvideo');                                           
obj.LoggingMode = 'disk';                                               
obj.DiskLogger = file;                                                  
start(obj)

But when I do, I receive the error:

 ??? MATLAB AVI.DLL is invalid. The Image Acquisition Toolbox may need to be reinstalled.

Best Answer

This error message occurs when MATLAB 6.5 (R13.0.1) has been reinstalled, but the Image Acquisition Toolbox 1.0 (R13.0.1+) has not. The Image Acqusition Toolbox 1.0 (R13.0.1+) ships a modified avi.dll file that enables its AVI file logging capabilities. If MATLAB is reinstalled without reinstalling the toolbox, the avi.dll version that the toolbox requires is no longer available. In order to prevent this error, reinstall the Image Acquisition Toolbox 1.0 (R13.0.1+).

Related Solutions

MATLAB: Does the application’s memory usage steadily increase when using the Image Acquisition Toolbox 1.5 (R14) to log images to disk

These memory issues are occurring essentially because images are being captured faster than the machine can encode them with the selected AVI codec and write them to disk. As such, after a period of time, the frame memory buffer overflows.

One option to work around this issue is to reduce the resolution size of the data you are capturing. For a list of the resolution formats supported by your camera, enter the following at the MATLAB Command Prompt:

a = imaqhwinfo('winvideo',1)
a.SupportedFormats

Another option is to use a different codec to compress the AVI-file data, which may ultimately result in less data being written to disk. Note that caution must be taken if this option is used, because most codecs are not designed for real-time compression As such, they may have difficulty "keeping up" with the frame rate. Because of this issue, it is often helpful to use no AVI compression at all.

For information on setting a different codec with your AVI-file, enter the following at the MATLAB command prompt:

doc avifile

MATLAB: Are there missing dll messages when creating a VIDEOINPUT object with the Image Acquisition Toolbox 1.0 (R13.0.1+)

This is a bug in Image Acquisition Toolbox 1.0 (R13.0.1+) in the way that it handles non-used hardware device libraries.

To work around this issue, try to rename or remove the adaptor dlls that you are not using.

For example, if you are only using the "winvideo" device, rename the mwmatroximaq.dll and mwdtimaq.dll files in

$MATLAB\toolbox\imaq\imaqadaptors\win32\

to mwmatroximaq.dl_ and mwdtimaq.dl_.

(where $MATLAB = the MATLAB root directory on your machine)

Best Answer

Related Solutions

MATLAB: Does the application’s memory usage steadily increase when using the Image Acquisition Toolbox 1.5 (R14) to log images to disk

MATLAB: Are there missing dll messages when creating a VIDEOINPUT object with the Image Acquisition Toolbox 1.0 (R13.0.1+)

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