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/silicon/ - technology

from the trenches
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Remember to keep it cozy!

File: 1439428360088.png (199.49 KB, 1235x650, 19:10, us-r=xy:g=xy:b=xy.png) ImgOps Google iqdb


Just your average A/V encoding enthusiast's thread.

Talk about codecs, containers, colorspaces and what you've been up to.

I've been playing around with ffmpeg's 'geq' filter from libavfilter. It essentially allows you to set the colour and alpha channels of each pixel depending on an equation you specify.

The command:

$ ffmpeg -i input.png -c:v png -filter geq='r=X*Y:g=X*Y:b=X*Y' output.png

produces the output on the left for any picture (but obviously the dimensions affect it).


File: 1439429967658-0.png (183.23 KB, 1235x650, 19:10, us-r=tan(X Y) 15:g=tan(y) ….png) ImgOps Google iqdb

File: 1439429967659-1.png (183.65 KB, 1235x650, 19:10, us-r=tan(X Y) 50:g=tan(y) ….png) ImgOps Google iqdb

File: 1439429967659-2.png (187.89 KB, 1235x650, 19:10, us-r=tan(X Y):g=tan(y):b=t….png) ImgOps Google iqdb

Now I think this is cooler.

ffmpeg -i input.png -c:v png -filter geq='r=tan(X+Y)+15:g=tan(Y)+15:b=tan(X)+15' output.png

What's really great about this one is if you vary the '15' in the above command, you get a different frequency of red, green and blue lines.

Now for some maths:
The redness of every pixel is decided by the function r = tan (X + Y) + 15, where X and Y are the coordinates of the pixel in question. tan θ is an asymptotic function that rises and rises to approach infinity when θ gets near 90, then 270, then 450, and so on. So, the strong red lines are when X + Y equal those values of θ.


Well. Be sure to know that there's at least one person interested in what you post here.




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File: 1450447756753-1.jpg (114 KB, 1280x720, 16:9, , Y 10).jpg) ImgOps Exif Google iqdb

File: 1450447756753-2.jpg (254.49 KB, 1280x720, 16:9, , Y).jpg) ImgOps Exif Google iqdb

Why, thank you!

In that case:

It is very easy to make the cool 3-D glasses effect with ffmpeg:
simply reset the red colour value of each pixel to that of a different pixel with geq.
$ ffmpeg -i INPUT.jpg -c:v mjpeg -filter geq='r=r(X - 10\, Y)' OUTPUT.jpg

Change around the formula in bold to yield different results.

Here are a few I made earlier, with the formulae in the file name.

File: 1437790976196.gif (9.14 MB, 636x357, 212:119, uncanny_hotel.gif) ImgOps Google iqdb



>Ten new hires at Henn-na hotel, opening on 17 July in Huis Ten Bosch theme park in southern Japan, are far from your average staffers.

>Enter the lobby, and a trio of robots in the form of cyborg woman, a Nao bot, and a robotic dinosaur will greet and take you through check-in. A cloakroom robot (a giant industrial robot arm) inside a transparent glass box swivels between drawers to store away luggage; an information robot chatters away about events on at the park; and some concierge bots show you to your room.
4 posts and 2 image replies omitted. Click reply to view.


>Call for a ban on sex robots


The age of the waifubot is drawing near. You can tell because people are getting angry and being bullies to our waifus :(


>reinforce traditional stereotypes of women
feminists really want to get raped by sexually frustrated guys of the internet era


Those bastards. Literally worse than hitler


They give then faces because otherwise you're just having sex with one of these. It's not the worst thing in the world but I could see a few people going on a psychotic break after having sex with a faceless person.


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glorious waifu age

File: 1442767581903.jpg (68.09 KB, 1280x720, 16:9, How-to-install-remove-GNOM….jpg) ImgOps Exif Google iqdb


What do you people think about Kali Linux?
In my opinion it's a pretty stable and flexible distro.
Any other opinions?
2 posts omitted. Click reply to view.


It's a convenience distro for having that kind of shit preinstalled, but apart from that, nothing especial, just another debian.


I've never tried it out, I might install it on a vm. Whadayaguis think about kali 2.0?


>In my opinion it's a pretty stable and flexible distro.
>pretty stable
>debian testing

No, anon.

>for the l33t3st hax0rs in w0rld

Negative. By default running everything with root.

This is distrobloat for students and ECH. Isn't for everyday use.


You are retarded if you use this as a more than temporary desktop OS.

It is designed as a preconfigured offensive pen testing tool. It is extremely insecure and should only be used as a boot from USB.

The kind of programs it has reinstalled create massive vulnerabilities in your system which is designed to be only for temporary use.


File: 1443120734013.gif (73.82 KB, 498x493, 498:493, 1440284578714.gif) ImgOps Google iqdb


Sorry I should've elaborated more, for a pen-testing Debian derivative its pretty good, though its really the only pen-testing os I can think of off the top of my head (Aside from black arch, but I dont know much about that :/.) For everyday day use it is terrible, and for a non pen-testing user it is practically useless. I just thought OP was using it for pen-testing, because I can't see another reason for using it :3

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