How to get the audio signal from a video

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Elysi Cochin 2017-2-8

编辑： Elysi Cochin 2017-2-8

I have a video, i needed to get the audio signal from the video...

I did as,

a = audioread('audio1.avi');

in some cases i can read the audio, but in some cases it is showing error such as

Error using audioread (line 88)
The file type is not supported
Error in demo_audio (line 5)
a = audioread('audio1.avi');

In some videos it shows the error as

Error using audioread (line 88)
Failed to initialize internal resources.
Error in demo_audio_extract (line 9)
input_file = audioread('audio1.avi');

Is there any other way to get the audio signal from a video... why does this error occur?

KSSV 2017-2-8

A quick googling leads to the following links:

KSSV 2017-2-8

You are supposed to have some toolbox mentioned in the link. You have seen that?

Elysi Cochin 2017-2-8

They say "As of release R2011a, this product was renamed Computer Vision System Toolbox"...

I have "Computer Vision System Toolbox", so how to edit the codes accordingly...

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