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Unable to determine the codec required.

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B.k Sumedha
B.k Sumedha on 23 May 2015
Edited: Mrutyunjaya Hiremath on 24 Apr 2020
I am using 2013a version of matlab and windows xp.When i run the code of videoreader i get this error.So what type of codec needs to be installed.
obj.reader = vision.VideoFileReader('atrium.avi');
obj.videoPlayer = vision.VideoPlayer();
obj.maskPlayer = vision.VideoPlayer();
obj.detector = vision.ForegroundDetector('NumGaussians', 3, 'NumTrainingFrames', 40, 'MinimumBackgroundRatio', 0.7);
obj.blobAnalyser = vision.BlobAnalysis('BoundingBoxOutputPort', true,'AreaOutputPort', true, 'CentroidOutputPort', true,'MinimumBlobArea', 400);

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Answers (2)

Walter Roberson
Walter Roberson on 23 May 2015
Edited: Walter Roberson on 23 May 2015
info = mmfileinfo('atrium.avi');
and examine
info.video.Format
Also, try
aviinfo('atrium.avi')
and if the command is found in your version of MATLAB (it was scheduled to be removed) then look at the VideoCompression field of the output of it.
Let us know what the results are.
See also https://www.raymond.cc/blog/determine-audio-video-codec-required-to-play-downloaded-movies/ and find a tool for your computer that will tell you which codec was used.
Note: if the codec shows up as Indeo5 then it is not readable with any 64 bit version of MATLAB (which is due to decisions made by the manufacturers of the Indeo5 codec)

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B.k Sumedha
B.k Sumedha on 23 May 2015
Error using mmfileinfo (line 71) Could not get file information.
Got this when i tried info = mmfileinfo('atrium.avi');
Walter Roberson
Walter Roberson on 23 May 2015
Were you able to use aviinfo()? Were you able to find a program for your system such as one of the ones suggested by the blog link I included?
Image Analyst
Image Analyst on 23 May 2015
Can you even play this file with Window Media Player? If you can't even do that, then it's not really a MATLAB question yet.

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Mrutyunjaya Hiremath
Mrutyunjaya Hiremath on 23 Apr 2020
Edited: Mrutyunjaya Hiremath on 24 Apr 2020
Hello,
To solve the problem, I installed 'Media Player Codec Pack' and use the following code.
vidObj = VideoReader('VideoFile.mp4');
read(vidObj);
get(vidObj)
currFrame = read(vidObj, 10);
vidFrames = read(vidObj,[100 Inf]);
vidFrames = read(vidObj,[18 27]);
The above problem solved in 2014b with 'readFrame' and 'hasFrame' functions.
currAxes = axes;
while hasFrame(vidObj)
vidFrame = readFrame(vidObj);
image(vidFrame, 'Parent', currAxes);
currAxes.Visible = 'off';
pause(1/vidObj.FrameRate);
end
Thank you.

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