Well, it is good to go from my perspective. Maybe wait for Dan to chime in.
One other thought for your consideration:
Would it be useful to have a mode that processes the alpha channel instead of
the color channels? You could use CV_8UC1 and pass in the alpha buffer. I could
image this being used as follows:1) Drop the same clip on two channels and
align them in time.
2) Apply the tracking filter on the top and apply it to the alpha channel3)
Apply a blur filter on the bottom channelThe tracked object would then be
obscured by a blurred version of itself.
~Brian
From: Jean-Baptiste Mardelle <j...@kdenlive.org>
To: mlt-devel@lists.sourceforge.net
Sent: Saturday, April 16, 2016 12:03 PM
Subject: Re: [Mlt-devel] New motion tracker filter
On Saturday, April 16, 2016 12:03:24 AM CEST, Brian Matherly wrote:
Hi Brian,
Thanks for the feedback.
> Could you look at how we do 2-pass analyze/apply filters in
> vid.stab and loudness and follow that convention?
> https://github.com/mltframework/mlt/blob/master/src/modules/vid.stab/filter_vidstab.yml
> https://github.com/mltframework/mlt/blob/master/src/modules/plus/filter_loudness.yml
> If all 2-pass filters use the same method for the "results"
> parameter, then it is easy to abstract 2-pass filters in
> applications because they all work the same.
Done.
> Is it possible for the rectangle to be changed to an oval?
Yes, I made the filter more generic now, with a "shape" property that can
draw rectangles, ellipses and arrows.
Now you can also select the OpenCV tracking algorithm.
I will try to integrate the filter in Kdenlive and if it works correctly
will ask if it's ok to merge to MLT's master.
Performance is quite good, it can do real-time tracking of 3 objects in a
1280x720 video on my 3 years old intel core i7.
Regards,
jb
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