[Lex Computer & Tech Group/LCTG] Computer graphics question

[Schonfeld]

Thank you, this is great information, and it turns out I can get Matlab
through my employer.  For now, however, I'm trying a more off-the-shelf
approach, based on the utility Macro Recorder (www.macrorecorder.com) and
Windows Video Editor.

On Tue, Aug 3, 2021 at 6:26 PM Tony <galaitsis at verizon.net> wrote:

> Hi Jonathan,
>
> 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.
>
> Following is an excerpt from my friend's email in response to my inquiry
> about the 3D capability (x-y pairs vs time/frames):
>
> "
>
> 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.
>
> "
> If I can be of any further help, please let me know.
> Cheers,
> Tony Galaitsis
> 781-718-7847
>
> ==============
> On 8/1/21 12:31 PM, Tony wrote:
>
> Jonathan,
>
> I have something that with some modification might help you get that
> information.
>
> *Question*: 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?
>
> *Comment: *My tool is MATLAB-based but we can work around that.
>
> Please call me off line to discuss, if you have not found an alternate
> solution. I will follow up with a call, too.
> Tony Galaitsis
> 781-862-3607
>
> ==============
> On 7/31/21 10:14 AM, Schonfeld wrote:
>
> 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.
>
> On Sat, Jul 31, 2021 at 9:54 AM Steve Isenberg <smisenberg at gmail.com>
> wrote:
>
>> Jonathan,
>> What are you trying to accomplish?  What is your goal, what would you do
>> with the coordinates or frame numbers?
>> 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??
>> -steve
>>
>> On Sat, Jul 31, 2021 at 9:46 AM Schonfeld <jschonf at gmail.com> wrote:
>>
>>> Hey wizards - Maybe someone can suggest a solution to the following
>>> question:
>>>
>>> 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
>>> ===============================================
>>> ::The Lexington Computer and Technology Group Mailing List::
>>> Reply goes to sender only; Reply All to send to list.
>>> Send to the list: LCTG at lists.toku.us      Message archives:
>>> http://lists.toku.us/private.cgi/lctg-toku.us
>>> To subscribe: email lctg-subscribe at toku.us  To unsubscribe: email
>>> lctg-unsubscribe at toku.us
>>> Future and Past meeting information: http://LCTG.toku.us
>>> List information: http://lists.toku.us/listinfo.cgi/lctg-toku.us
>>> This message was sent to s+lctglist at smistuff.com.
>>> Set your list options:
>>> http://lists.toku.us/options.cgi/lctg-toku.us/s+lctglist@smistuff.com
>>
>>
> ===============================================
> ::The Lexington Computer and Technology Group Mailing List::
> Reply goes to sender only; Reply All to send to list.
> Send to the list: LCTG at lists.toku.us      Message archives: http://lists.toku.us/private.cgi/lctg-toku.us
> To subscribe: email lctg-subscribe at toku.us  To unsubscribe: email lctg-unsubscribe at toku.us
> Future and Past meeting information: http://LCTG.toku.us
> List information: http://lists.toku.us/listinfo.cgi/lctg-toku.us
> This message was sent to galaitsis at verizon.net.
> Set your list options: http://lists.toku.us/options.cgi/lctg-toku.us/galaitsis@verizon.net
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.toku.us/pipermail/lctg-toku.us/attachments/20210804/a4c1a917/attachment.html>