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Record and Play Audio
play(gong);
For an additional example, see “Recording or Playing Audio within a
Function” on page 7-5.
If you do not specify the sample rate,
sound
plays back at 8192 hertz. For any
playback, specify smaller sample rates to play back more slowly, and larger
sample rates to play back more quickly.
Note Most sound cards support sample rates between approximately 5,000
and 48,000 hertz. Specifying sample rates outside this range can produce
unexpected results.
Recording or Playing Audio within a Function
If you create an
audioplayer
or
audiorecorder
object inside a function,
the object exists only for the duration of the function. For example, create a
player function called
playFile
and a simple callback function
showSeconds
:
function playFile(myfile)
load(myfile);
obj = audioplayer(y, Fs);
obj.TimerFcn = 'showSeconds';
obj.TimerPeriod = 1;
play(obj);
end
function showSeconds
disp('tick')
end
Call
playFile
from the command prompt to play the file
handel.mat
:
playFile('handel.mat')
At the recorded sample rate of 8192 samples per second, playing the 73113
samples in the file takes approximately 8.9 seconds. However, the
playFile
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Audio and Video
function typically ends before playback completes, and clears the
audioplayer
object
obj
.
To ensure complete playback or recording, consider the following options:
• Use
playblocking
or
recordblocking
instead of
play
or
record
. The
blocking methods retain control until playing or recording completes. If you
block control, you cannot issue any other commands or methods (such as
pause
or
resume
)during the playback or recording.
• Create an output argument for your function that generates an object in
the base workspace. For example, modify the
playFile
function to include
an output argument:
function obj = playFile(myfile)
Call the function:
h = playFile('handel.mat');
Because
h
exists in the base workspace, you can pause playback from the
command prompt:
pause(h)
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Get Information about Video Files
Get Information about Video Files
VideoReader
creates an object that contains properties of the video file,
including the duration, frame rate, format, height, and width. To view these
properties, or store them in a structure, use the
get
method. For example, get
the properties of the file
xylophone.mp4
:
xyloObj = VideoReader('xylophone.mp4');
info = get(xyloObj)
The
get
function returns:
info =
Duration: 4.7000
Name: 'xylophone.mp4'
Path: [1x88 char]
Tag: ''
Type: 'VideoReader'
UserData: []
BitsPerPixel: 24
FrameRate: 30
Height: 240
NumberOfFrames: 141
VideoFormat: 'RGB24'
Width: 320
To access a specific property of the object, such as
Duration
,use dot notation
as follows:
duration = xyloObj.Duration;
Note For files with a variable frame rate,
VideoReader
cannot return
the number of frames until you read the last frame of the file. For more
information, see “Read Variable Frame Rate Video” on page 7-9.
See Also
get |
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Audio and Video
Read Video Files
In this section...
“Import Video Data from a File” on page 7-8
“Display Video Frame with Colormap” on page 7-8
“Process Frames of a Video File” on page 7-9
“Read Variable Frame Rate Video” on page 7-9
“Supported Video File Formats” on page 7-11
Import Video Data from a File
To import video data from a file, construct a reader object with
VideoReader
and read selected frames with the
read
function.
For example, import all frames in the file
xylophone.mp4
:
xyloObj = VideoReader('xylophone.mp4');
vidFrames = read(xyloObj);
It is not necessary to close the multimedia object.
Display Video Frame with Colormap
Use the
read
function to specify a video frame to read. For example, read the
second frame in a hypothetical file,
indexedImg.avi
.
obj = VideoReader('indexedImg.avi');
vidFrame = read(obj,2);
Use the
image
function to display the video frame. For indexed video, you
can apply a colormap. In this case,
gray(256)
applies a linear grayscale
colormap of length 256.
image(vidFrame)
colormap(gray(256))
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Read Video Files
Process Frames of a Video File
This example shows how to save memory by processing a video one frame at
atime. For faster processing, preallocate memory to store the video data.
Convert the file
xylophone.mp4
to a MATLAB movie, and play it with the
movie
function
Create a
VideoReader
object for
xylophone.mp4
. Determine the number of
frames, and the height and width of the frames.
xyloObj = VideoReader('xylophone.mp4');
nFrames = xyloObj.NumberOfFrames;
vidHeight = xyloObj.Height;
vidWidth = xyloObj.Width;
Preallocate the movie structure.
mov(1:nFrames) = ...
struct('cdata',zeros(vidHeight,vidWidth,3,'uint8'),...
'colormap',[]);
Read one frame at a time.
for k = 1 : nFrames
mov(k).cdata = read(xyloObj,k);
end
Play back the movie once at the video’s frame rate.
movie(mov,1,xyloObj.FrameRate);
Read Variable Frame Rate Video
Some files store video at a variable frame rate, including many Windows
Media Video files. For these files,
VideoReader
cannot determine the number
of frames until you read the last frame.
For example, consider a hypothetical file
VarFrameRate.wmv
that has a
variable frame rate. A call to
VideoReader
to create the multimedia object
such as
obj = VideoReader('VarFrameRate.wmv')
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Audio and Video
returns the following warning and summary information:
Warning: Unable to determine the number of frames in this file.
Summary of Multimedia Reader Object for 'VarFrameRate.wmv'.
Video Parameters:
23.98 frames per second, RGB24 1280x720.
Unable to determine video frames available.
Counting Frames
To determine the number of frames in a variable frame rate file, call
read
with the following syntax:
lastFrame = read(obj, inf);
This command reads the last frame and sets the
NumberOfFrames
property of
the multimedia object. Because
VideoReader
must decode all video data to
count the frames reliably, the call to
read
sometimes takes a long time to run.
Specifying the Frames to Read
For any video file, you can specify the frames to read with a range of indices.
Usually, if you request a frame beyond the end of the file,
read
returns an
error.
However, if the file uses a variable frame rate, and the requested range
straddles the end of the file,
read
returns a partial result. For example, given
afile with 2825 frames associated with the multimedia object
obj
,a call to
read frames 2800 - 3000 as follows:
images = read(obj, [2800 3000]);
returns:
Warning: The end of file was reached before the
requested frames were read completely.
Frames 2800 through 2825 were returned.
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Read Video Files
Supported Video File Formats
The
VideoReader
function reference page lists file formats that
VideoReader
usually can read, including AVI, MPEG-1, andMotion JPEG 2000. Sometimes
VideoReader
can read files in unlisted formats, and sometimes it cannot
read files in listed formats.
For video data, the term “file format” often refers either to the container
format or the codec. A container format describes the layout of the file, while a
codec describes how to code/decode the data. Many container formats support
multiple codecs.
To read a video file, any application must:
• Recognize the container format (such as AVI). The
VideoReader
function
reference page lists the supported container formats.
• Have access to the codec associatedwith the particular file. Some codecs are
part of standard Windows and Macintosh system installations, and allow
you to play video in Windows Media Player or QuickTime.
VideoReader
can access most, but not all, of these codecs.
• Properly interpret the codec.
VideoReader
cannot always read files
associated with codecs that were not part of your original system
installation.
To see the codec associated with a video file, use
mmfileinfo
and view the
Format
field. For example, given a hypothetical AVI file that uses the Indeo®
5codec, the following code:
info = mmfileinfo('myfile.avi');
info.Video.Format
returns
ans =
IV50
See Also
VideoReader | mmfileinfo | movie
7-11
7
Audio and Video
Convert Between Image Sequences and Video
This example shows how to convert between video files and sequences of
image files using VideoReader and VideoWriter.
The sample file named
shuttle.avi
contains 121 frames. Convert the frames
to image files using VideoReader and the
imwrite
function. Then, convert
the image files to an AVI file using VideoWriter.
Setup
Create a temporary working folder to store the image sequence.
workingDir = tempname;
mkdir(workingDir);
mkdir(workingDir,'images');
Construct a VideoReader Object
Create a VideoReader object to use for reading frames from the file.
shuttleVideo = VideoReader('shuttle.avi');
Create the Image Sequence
Loop through the video, reading each frame into a width-by-height-by-3 array
named
img
.Write out each image to a JPEG file with a name in the form
imgN.jpg
,where N is the frame number:
img1.jpg
img2.jpg
...
img121.jpg
for ii = 1:shuttleVideo.NumberOfFrames
img = read(shuttleVideo,ii);
% Write out to a JPEG file (img1.jpg, img2.jpg, etc.)
imwrite(img,fullfile(workingDir,'images',sprintf('img%d.jpg',ii)));
end
7-12
Convert Between Image Sequences and Video
Read and Sort the Image Sequence into MATLAB
Find all the JPEG file names in the
images
folder. Convert the set of image
names to a cell array.
imageNames = dir(fullfile(workingDir,'images','*.jpg'));
imageNames = {imageNames.name}';
Notice that the image file names are not in numeric order.
disp(imageNames(1:10));
'img1.jpg'
'img10.jpg'
'img100.jpg'
'img101.jpg'
'img102.jpg'
'img103.jpg'
'img104.jpg'
'img105.jpg'
'img106.jpg'
'img107.jpg'
To sort the file names, extract the frame numbers from the file names and
use them to sort the array.
First, match any file names that contain a sequence of numeric digits.
Convert the strings to doubles.
imageStrings = regexp([imageNames{:}],'(\d*)','match');
imageNumbers = str2double(imageStrings);
Sort the frame numbers from lowest to highest. The
sort
function returns an
index matrix that indicates how to order the associated files.
[~,sortedIndices] = sort(imageNumbers);
sortedImageNames = imageNames(sortedIndices);
The sequence file names are now sorted.
7-13
7
Audio and Video
disp(sortedImageNames(1:10));
'img1.jpg'
'img2.jpg'
'img3.jpg'
'img4.jpg'
'img5.jpg'
'img6.jpg'
'img7.jpg'
'img8.jpg'
'img9.jpg'
'img10.jpg'
Create a New Video with the Image Sequence
Construct a VideoWriter object, which creates a Motion-JPEG AVI file by
default.
outputVideo = VideoWriter(fullfile(workingDir,'shuttle_out.avi'));
outputVideo.FrameRate = shuttleVideo.FrameRate;
open(outputVideo);
Loop through the image sequence, load each image, and then write it to the
video.
for ii = 1:length(sortedImageNames)
img = imread(fullfile(workingDir,'images',sortedImageNames{ii}));
writeVideo(outputVideo,img);
end
Finalize the video file.
close(outputVideo);
View the Final Video
Construct a reader object.
shuttleAvi = VideoReader(fullfile(workingDir,'shuttle_out.avi'));
7-14
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