You use v1.read(i1) after v1.CurrentTime = 1.5 . You can only use read() if you have never set the CurrentTime. You will need to switch to readFrame()
Warning: multiplying framerate by duration has round-off error even for fixed framerates, and is just plain wrong for variable frame rates. The only way to accurately know the number of frames is to loop reading frames and counting them.
I recommend that you do not bother to try to estimate frames and instead use a structure like
while true
got_one = false;
had_problem = false;
if hasFrame(v1)
v1frame = readFrame(v1);
if isvalid(ax1)
image(v1frame, 'Parent', ax1);
got_one = true;
else
had_problem = true;
end
end
if had_problem; break; end
if hasFrame(v2)
v2frame = readFrame(v2);
if isvalid(ax2)
image(v2frame, 'Parent', ax2);
got_one = true;
else
had_problem = true;
end
end
if had_problem; break; end
if ~got_one; break; end
drawnow();
end
Except that I would recommend changing the CData of the image objects instead of using image() calls, for performance reasons.
