Main Content

hasFrame

Determine if video frame is available to read

Description

example

tf = hasFrame(v) returns logical 1 (true) if there is a video frame available to read from the file associated with v. Otherwise, it returns logical 0 (false).

Examples

collapse all

Create a VideoReader object for the sample video file xylophone_video.mp4.

v = VideoReader("xylophone_video.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              

Clear the VideoReader object.

clear v

Create a VideoReader object for the sample video file xylophone_video.mp4. Then determine the width and height of the video.

xyloObj = VideoReader("xylophone_video.mp4");
vidWidth = xyloObj.Width;
vidHeight = xyloObj.Height;

Create a video structure array.

mov = struct("cdata",zeros(vidHeight,vidWidth,3,"uint8"),colormap=[]);

Read one frame at a time until the end of the video.

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, and then play the video one time.

vf = figure(Position=[0 0 xyloObj.Width xyloObj.Height]);
imshow(mov(1).cdata,Border="tight")
movie(vf,mov,1,xyloObj.FrameRate)

Figure contains an axes object. The axes object contains an object of type image.

Clear the VideoReader object.

clear xyloObj

Input Arguments

collapse all

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