How can I sync the video along with the plot?

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Sujan Ponnappa
Sujan Ponnappa 2019-12-16
回答： Rajesh Ranjan 2019-12-18
I have a code below to play the video and plot the data at the same time. But I am not able to sync the video properly with the graph.
How can I achieve this? I have also attached the raw excel file of the data I want to plot
%% Setup the subplots
ax1 = subplot(2,1,1); % For video
ax2 = subplot(2,1,2); % For pressure plot
%%% Setup VideoReader object
filename = 'slice1.avi';
v = VideoReader(filename);
frameratevideo=v.FrameRate;
nFrames = v.Duration*v.FrameRate; % Number of frames
% Display the first frame in the top subplot
vidFrame = readFrame(v);
v.CurrentTime = 16;
image(vidFrame, 'Parent', ax1);
ax1.Visible = 'off';
%%% Load the pressure data
t = ts; % your actual data
y = ys;
nDataPoints = length(t); % Number of data points
%step = round((nFrames/nDataPoints));
index = 1:0.44:nDataPoints;
i = 2;
% Diplay the plot corresponds to the first frame in the bottom subplot
h = plot(ax2,t(1:index(i)),y(1:index(i)),'-k');
% Fix the axes
ax2.XLim = [t(1) t(end)];
ax2.YLim = [min(y) max(y)];
%%% Animate
while hasFrame(v)
pause(1/v.FrameRate);
%pause(0.01)
vidFrame = readFrame(v);
image(vidFrame, 'Parent', ax1);
ax1.Visible = 'off';
i = i + 1;
set(h,'YData',y(1:index(i)), 'XData', t(1:index(i)))
end

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回答（1 个）

Rajesh Ranjan
Rajesh Ranjan 2019-12-18
Sujan, this is how I do it and it comes out synced.
v = VideoReader('testVideo.avi')
frameratevideo=v.FrameRate;
nFrames = v.Duration*v.FrameRate; % Number of frames
v.CurrentTime = 0.0;
x = 0:0.1:10
y = sin(x)
myVideo = VideoWriter('myVideoFile'); %open video file
myVideo.FrameRate = 5; %same as the input video
open(myVideo)
figure(1)
set(gcf,'Position',[100 100 800 400])
sub1=subplot(1,2,1)
sub2=subplot(1,2,2)
h2=animatedline('marker','o');
i=0;
%%% Animate
while hasFrame(v)
pause(1/v.FrameRate);
%pause(0.01)
vidFrame = readFrame(v);
image(vidFrame, 'Parent', sub1);
sub1.Visible = 'off';
i = i + 1;
addpoints(h2,x(i),y(i));
drawnow
%pause(0.1)
pause(1/v.FrameRate);
frame=getframe(gcf);
writeVideo(myVideo, frame);
% set(h,'YData',y(1:index(i)), 'XData', t(1:index(i)))
end
close(myVideo)

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