read (mmreader) - Read video frame data from multimedia reader object
Syntax
video =
read(obj)
video =
read(obj, index)
Description
video =
read(obj) reads in all video
frames from the associated file. video is
an H-by-W-by-B-by-F matrix
where H is the image frame height, W is
the image frame width, B is the number
of bands in the image (e.g., 3 for RGB), and F is
the number of frames read in. video contains uint8 data
representing RGB24 video frames.
video =
read(obj, index)
reads only the frames specified by index,
where the first frame number is 1. index can
be a single index, or a two-element array representing an index range
of the video stream.
For example:
video = read(obj, 1); % first frame only
video = read(obj, [1 10]); % first 10 frames
video = read(obj, Inf); % last frame only
video = read(obj, [50 Inf]); % frame 50 through end of file
For information about specifying the index in variable frame
rate files, see mmreader.
Examples
Read and play back the movie file xylophone.mpg.
xyloObj = mmreader('xylophone.mpg');
nFrames = xyloObj.NumberOfFrames;
vidHeight = xyloObj.Height;
vidWidth = xyloObj.Width;
% Preallocate 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
% Size a figure based on the video's width and height.
hf = figure;
set(hf, 'position', [150 150 vidWidth vidHeight])
% Play back the movie once at the video's frame rate.
movie(hf, mov, 1, xyloObj.FrameRate);See Also
get (hgsetget), mmreader, movie,
set (hgsetget)
 | rcond | | read (Tiff) |  |
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