hasFrame
Determine if video frame is available to read
Syntax
Description
Examples
Create VideoReader Object and Read Video
Create a VideoReader
object for the example movie file xylophone.mp4
.
v = VideoReader('xylophone.mp4');
Read all the frames from the video, one frame at a time.
while hasFrame(v) frame = readFrame(v); end
Display information about the last frame returned by readFrame
.
whos frame
Name Size Bytes Class Attributes frame 240x320x3 230400 uint8
Read and Play Back Movie File
Read and play back the sample movie file, xylophone.mp4
.
Create a VideoReader
object to read
data from the sample file. Then, determine the width and height of
the video.
xyloObj = VideoReader('xylophone.mp4');
vidWidth = xyloObj.Width;
vidHeight = xyloObj.Height;
Create a movie structure array, mov
.
mov = struct('cdata',zeros(vidHeight,vidWidth,3,'uint8'),... 'colormap',[]);
Read one frame at a time until the end of the video is reached.
k = 1; while hasFrame(xyloObj) mov(k).cdata = readFrame(xyloObj); k = k+1; end
Size a figure based on the width and height of the video. Then, play back the movie once at the video frame rate.
hf = figure;
set(hf,'position',[150 150 vidWidth vidHeight]);
movie(hf,mov,1,xyloObj.FrameRate);
Input Arguments
v
— Input VideoReader object
VideoReader
object
Input VideoReader object. Use the VideoReader
function to
create a VideoReader
object from your video file.
Extended Capabilities
C/C++ Code Generation
Generate C and C++ code using MATLAB® Coder™.
Version History
Introduced in R2014b
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