readFrame() too slow. How to switch too VideoFileReader and VideoPlayer?

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Sam
Sam 2020-8-4
评论： Walter Roberson 2020-8-4
Hello,
I've written a code in which a user has to click on the video while it is being played. Unfortunately, the readFrame() method is too slow. I came across the VideoFileReader and VideoPlayer method, but I can't seem to figure out how to put a figure handle to the VideoPlayer window... In my code, I created a handle using image(temp,'Parent',curr_axes), but I can't seem to do the same for videoPlayer. Can anybody help?
%Load file
clear all, close all, clc;
fileList = dir('*.mp4');
video_name = fileList.name;
vid = VideoReader(video_name);
curr_axes = axes;
hfig = figure(1);
%Use callback function to register any mouse clicks on the figure
set(hfig,'WindowButtonDownFcn',@countclicks)
%Play video
framecount = 0;
while vid.hasFrame() %Play video
temp = vid.readFrame();
count = framecount + 1;
image(temp,'Parent',curr_axes);
if framecount == 1
figure(hfig);
p2 = imellipse;
vert_p2 = getVertices(p2);
wait(p2);
end
pause(0.05/25);
end

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采纳的回答

Walter Roberson
Walter Roberson 2020-8-4
%Load file
fileList = dir('*.mp4');
video_name = fileList(1).name;
vid = vision.VideoFileReader(video_name);
hfig = figure(1);
curr_axes = axes('Parent', hfig);
box(curr_axes, 'off');
imh = image(curr_axes, []); %establish the handle
%Use callback function to register any mouse clicks on the figure
set(hfig,'WindowButtonDownFcn',@countclicks)
%Play video
framecount = 0;
while ~isdone(vid) %read and play video
temp = step(vid);
count = framecount + 1;
set(imh, 'CData', temp);
if framecount == 1
p2 = imellipse(curr_axes);
vert_p2 = getVertices(p2);
wait(p2);
end
pause(0.05/25);
end
  2 个评论
Sam
Sam 2020-8-4
Thank you! But unfortunately, this videoreader is even slower in my case...
Walter Roberson
Walter Roberson 2020-8-4
How are you measuring the speed? Did you comment out the pause() and put in a tic and toc at appropriate places?

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