VideoReader: Unrecognized function or variable 'hasFrame'

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Alexander Brandt
Alexander Brandt 2024-7-23
移动：Walter Roberson 2024-7-23
I am following the VideoReader documentation from https://www.mathworks.com/help/matlab/ref/videoreader.html
When I try to run the example code using R2024a Update 5,
currAxes = axes;
v = VideoReader("xylophone_video.mp4");
while hasFrame(v)
vidFrame = readFrame(v);
image(vidFrame,"Parent",currAxes)
currAxes.Visible = "off";
pause(1/v.FrameRate)
end
the line with while hasFrame(v) throws an error: Unrecognized function or variable 'hasFrame'.
The VideoReader object was created, but the hasFrame(v) line does not work. Was support for this function removed? If so, what replaced it?
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Alexander Brandt
Alexander Brandt 2024-7-23
@Walter Roberson It gives me:
Methods for class VideoWriter:
VideoWriter delete open set
close get saveobj writeVideo
Static methods:
getProfiles
Methods of VideoWriter inherited from handle
It doesn't list hasFrame as one of the methods for the class.
Avni Agrawal
Avni Agrawal 2024-7-23
MATLAB Version: 24.1.0.2537033 (R2024a)
Operating System: Microsoft Windows 11 Enterprise Version 10.0 (Build 22631)

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采纳的回答

Avni Agrawal
Avni Agrawal 2024-7-23
移动：Walter Roberson 2024-7-23
You are trying to access VideoWriter instead of VideoReader. Are you sure the code you are trying to run has VideoReader() but not VideoWriter() ?
Because, methods(v) is returning:
Methods for class VideoReader:
VideoReader hasFrame read saveobj
get inspect readFrame set
Static methods:
getFileFormats

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