MATLAB Programming

6 Data Import and Export
Exporting Audio/Video Data
MATLAB includes several functions that you can use to export audio or video
data from the MATLAB workspace. These functions write audio data to a file
using specific file formats. The following sections describe
• “Exporting Audio Data” on page 6-94
• “Exporting Video Data in AVI Format” on page 6-94
This section also provides an example of writing video data to a file in
“Example: Creating an AVI file” on page 6-95.
Exporting Audio Data
In MATLAB, audio data is simply numeric data that you can export using
standard MATLAB data export functions, such as save.
MATLAB also includes several functions that write audio data to files in
specific file formats:
• auwrite —Exports sound data in AU file format
• wavwrite —Exports sound data in WAV file format
Exporting Video Data in AVI Format
You can export MATLAB video data as an Audio/Video Interleaved (AVI) file.
To do this, you use the avifile function to create an avifile object. Once
you have the object, you can use AVI file object methods and properties to
control various aspects of the data export process.
For example, in MATLAB, you can save a sequence of graphs as a movie
that can then be played back using the movie function. You can export a
MATLAB movie bysavingitinMAT-fileformat,likeanyotherMATLAB
workspace variable. However, anyone who wants to view your movie must
have MATLAB. (For more information about MATLAB movies, see the
Animation section in the MATLAB Graphics documentation.)
To export a sequence of MATLAB graphs in a format that does not require
MATLAB for viewing, save the figures in Audio/Video Interleaved (AVI)
6-94