double video player inside app

Hello everybody,

I have this problem:

I have to create a viewer for two synchronized videos from two gopro.

the aim is to be able to see frames by frames in order to be able to stop, to move one frame at a time so as to be able to identify the exact moment of a certain event.

my problem is that when I play two videos they are no longer synchronous and one goes faster than the other. how can I do? for now I have used these two solutions, both give me the same result and I don't know why!

Solution 1:

for i = 1:range

if app.Button_8.Value==0

app.Button_8.Icon='Play1.png';

break

end

app.Index_Video_Events=i;

gp1=[app.FrameGP1+i app.FrameGP2+i]

if app.AttivoGP1CheckBox.Value ==1 % play file video GP1

vidFrame_GP1=read(app.Video_Gopro1,app.FrameGP1+i);

imshow(vidFrame_GP1, 'Parent', app.UIAxes_3);

pause(0.01)

end

if app.AttivoGP2CheckBox.Value ==1 % play file video GP1

vidFrame_GP2=read(app.Video_Gopro2,app.FrameGP2+i);

imshow(vidFrame_GP2, 'Parent', app.UIAxes_4);

pause(0.01)

end

app.Slider_2.Value=app.Tap_Video_Start+app.Index_Video_Events;

end

end

Solution 2:

while hasFrame(app.Video_Gopro1)&&hasFrame(app.Video_Gopro2)

vidFrameGP1=readFrame(app.Video_Gopro1);

imshow(vidFrameGP1, 'Parent', app.UIAxes_3);

pause(1/framerate);

vidFrameGP2=readFrame(app.Video_Gopro2);

imshow(vidFrameGP2, 'Parent', app.UIAxes_4);

pause(1/framerate);

app.Slider_2.Value=app.numFrames+app.Tap_Video_Start;

app.numFrames = app.numFrames + 1;

if app.Button_8.Value==0

app.Button_8.Icon='Play1.png';

break

end

end