avi audio plot

 i have an .avi  video...i need to plot the audio of it.. in simple i need to analyse the audio of an .avi video... please suggest a method for it... i have tried all sort of searches and unable to get it done

Answer 1

[Wayne King]

I'm going to assume that you mean the Signal Processing Blockset, since the DSP System Toolbox did not exist in R2010a.

In R2010a with SP blockset, you can use the System object signalblks.MultimediaFileReader.

For example:

filename = 'youravifile.avi';
hmfr = signalblks.MultimediaFileReader(filename,...
    'AudioOutputPort',true,'VideoOutputPort',false);
while ~isDone(hfmr)
audio = step(hfmr);
end

Every time step is called audio contains one frame of the audio. In the above, the next frame is overwriting the previous one, but you can save the audio frames or directly write them to a file with signalblks.MultiMediaFileWriter

[Max]

thank you wayne... it worked so well... i thank you sincerely...

Answer 2

[Wayne King]

Hi Max, what version of MATLAB are you using? Depending on what version of MATLAB you are running and which products you have access to, there are System objects you can use to read in an .avi file and separate the video and audio content.

Do you have a recent version of MATLAB with the Computer Vision System Toolbox, DSP System Toolbox, or their prior versions - VIP blockset, or SP blockset?

Answer 3

[Max]

i am using matlab R2010a version of matlab...yes i do have dsp system toolbox