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<p>Hi Jonathan,</p>
<p>This is a follow up to my call earlier today. MATLAB-2021 has a
script (VideoReader.m) that I believe will address your needs. I
just hope that you have access to MATLAB-2021 through your MIT
connections.</p>
<p>Following is an excerpt from my friend's email in response to my
inquiry about the 3D capability (x-y pairs vs time/frames):</p>
<p>"</p>
<pre class="moz-quote-pre" wrap=""><font color="blue">My version of MATLAB (2021a) has a function called "VideoReader". It reads in an MP4 file and returns an object with describing the frames and various other properties. I have only tried the example provided by MATLAB, so I don't have a lot of knowledge about this feature.
Using the example from my MATLAB installation, I've made a script that plays the example MP4 file frame by frame:
vidObj = VideoReader('xylophone.mp4');
vidObj.CurrentTime
while(hasFrame(vidObj))
frame = readFrame(vidObj);
imshow(frame);
title(sprintf('Current Time = %.3f sec', vidObj.CurrentTime));
pause(2/vidObj.FrameRate);
end
The file "xylophone.mp4", comes with the MATLAB installation
This is all Windows based, so I don't know where MACs have a default installation for a user.
</font></pre>
<p><font color="blue">"</font><br>
</p>
<div class="moz-cite-prefix">If I can be of any further help, please
let me know.</div>
<div class="moz-cite-prefix">Cheers,</div>
<div class="moz-cite-prefix">Tony Galaitsis</div>
<div class="moz-cite-prefix">781-718-7847</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">==============</div>
<div class="moz-cite-prefix">On 8/1/21 12:31 PM, Tony wrote:<br>
</div>
<blockquote type="cite"
cite="mid:29eaa7e8-ed24-0824-0c55-fb214f2622c7@verizon.net">
<p>Jonathan,</p>
<p>I have something that with some modification might help you get
that information. <br>
</p>
<p><u><i><b>Question</b></i></u>: Youtube videos list the running
time (low-left part of frame) at rounded-off 1-sec intervals.
Would the 1-sec tolerance be sufficient for your needs? <br>
</p>
<p><u><i><b>Comment: </b></i></u>My tool is MATLAB-based but we
can work around that. <br>
</p>
<p>Please call me off line to discuss, if you have not found an
alternate solution. I will follow up with a call, too.</p>
Tony Galaitsis<br>
781-862-3607<br>
<p>==============<br>
</p>
<div class="moz-cite-prefix">On 7/31/21 10:14 AM, Schonfeld wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAMrdKmtO5Tx4oX0snC_7TPYG099EnGbtjLE_+Pgcz0rRmo8TpQ@mail.gmail.com">
<div dir="ltr">I want to measure how new-track
starting locations are distributed around the decay source.
Quantum mechanics makes a clear prediction but, remarkably, it
has never been tested (to my knowledge). Times or frame
numbers are nice-to-have. I could do without them.</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sat, Jul 31, 2021 at 9:54
AM Steve Isenberg <<a href="mailto:smisenberg@gmail.com"
moz-do-not-send="true">smisenberg@gmail.com</a>> wrote:<br>
</div>
<blockquote class="gmail_quote">
<div dir="auto">Jonathan,</div>
<div dir="auto">What are you trying to accomplish? What is
your goal, what would you do with the coordinates or frame
numbers?</div>
<div dir="auto">You might be able to grab this info manually
using video editing software but I don’t know a way to do
it automatically. Maybe there’s an app??</div>
<div dir="auto">-steve </div>
<div><br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sat, Jul 31, 2021
at 9:46 AM Schonfeld <<a
href="mailto:jschonf@gmail.com" target="_blank"
moz-do-not-send="true">jschonf@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote">
<div dir="ltr">Hey wizards - Maybe someone can suggest
a solution to the following question:
<div><br>
</div>
<div>I've downloaded a YouTube video as an mp4
file. (It's a video of tracks emanating from a
small radioactive source in a cloud chamber.)
From time to time I want to point and click on a
feature in the video (the starting point of a new
track) and have the coordinates and time (or frame
number) of the click automatically written to an
Excel file. I mostly use a PC but I could easily
move to a Mac or iPad. Do you know any simple
ways to do this? - Jonathan Schonfeld</div>
</div>
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