Unable to determine the codec required.

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);

Answer 1

[Walter Roberson]

Use mmfileinfo()

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)

[B.k Sumedha]

Error using mmfileinfo (line 71) Could not get file information.

Got this when i tried info = mmfileinfo('atrium.avi');

[Walter Roberson]

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]

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.

Answer 2

[Mrutyunjaya Hiremath]

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.

[Kai Hillers]

Hello Mrutyunjaya Hiremath,

where did you find this 'Media Player Codec Pack'? I can't find it on the AddOn section of MatLab.

Kind regards,

Kai

[Walter Roberson]

https://www.mediaplayercodecpack.com/ for Media Player Codec Pack

[cui,xingxing]

@Walter Roberson this comment can't work for me ,can you provide some suggestions? thanks in advance.

https://www.mathworks.com/matlabcentral/answers/1902545-videoreader-reads-h264-video-compression-file-with-error-caught-unexpected-exception-of-unknown