Show HN: Vector Video • Hacker News Board

Re: Show HN: Vector Video

#11

Post by 33a » Fri, Oct 07, 2016, 3:54 PM UTC

Reminds me of a little webgl demo I made a long time back:

http://mikolalysenko.github.io/gif-3d/

Re: Show HN: Vector Video

#12

Post by 33a » Fri, Oct 07, 2016, 3:54 PM UTC

Reminds me of a little webgl demo I made a long time back:

http://mikolalysenko.github.io/gif-3d/

Re: Show HN: Vector Video

#13

Post by bhouston » Fri, Oct 07, 2016, 3:57 PM UTC

Usually people motion interpolation: https://en.wikipedia.org/wiki/Motion_interpolation There are some really perfect algorithms out there for this.

And they also do upscaling via a high quality sinc filter: https://en.wikipedia.org/wiki/Whittaker%E2%80%93Shannon_inte...

The main issue you have is gif artifacts from the extreme color quantization. Something like this might help: http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.422...

Re: Show HN: Vector Video

#14

Post by syedrezaali » Fri, Oct 07, 2016, 4:42 PM UTC

Awesome post, I recently made F3, which allows you to design 3D form using image sequences. Check it out: http://www.syedrezaali.com/f3-mac-app/

Re: Show HN: Vector Video

#15

Post by blurbleblurble » Fri, Oct 07, 2016, 6:02 PM UTC

I'm really into this... I have a goal of one day figuring out how to save, render and manipulate 4+ dimensional voxel graphs with unlimited depth. When I say unlimited, I mean that there could be procedural elements at any depth.

Basically, I'm talking about some kind of voxel representation that is more or less "scale invariant".

Re: Show HN: Vector Video

#16

Post by SuperPaintMan » Fri, Oct 07, 2016, 6:09 PM UTC

bhouston wrote: post #13

Usually people motion interpolation: https://en.wikipedia.org/wiki/Motion_interpolation There are some really perfect algorithms out there for this. And they also do upscaling via a high quality sinc filter: https://en.wikipedia.org/wiki/Whittaker%E2%80%93Shannon_inte... The main issue you have is gif artifacts from the extreme color quantization. Something like this might help: http://citeseerx.ist.psu.edu/viewdoc/d…

Thanks for the pointers, that last bit on quantization especially.

Re: Show HN: Vector Video

#17

Post by SuperPaintMan » Fri, Oct 07, 2016, 6:14 PM UTC

anoother wrote: post #8

If the OP is reading this... Try animating a large cube moving into the logo, and using the boolean subtract modifier between each mesh and this cube. Place the cube on another (invisible) layer, et voila. You can leave your camera fixed in the same place, too. EDIT to add: I should have mentioned, I think this is a very cool idea! I might just steal it one day ;)

Need to run off to work at the moment but I'll give it a shot. Wouldn't you need to move two cubes through the mesh leaving a small space to be drawn?

Steal it by all means!

Re: Show HN: Vector Video

#18

Post by SuperPaintMan » Fri, Oct 07, 2016, 6:15 PM UTC

ryan-c wrote: post #9

brudgers wrote: post #5

Earlier quoted context omitted.

Visited with latest Ubuntu Firefox with no problem.

Firefox aggressively caches intermediate certificates and uses them to build trust paths when they're not included by the server. This can mask configuration errors.

This here is why I didn't notice any errors. Will patch in a few hours.

Re: Show HN: Vector Video

#19

Post by SuperPaintMan » Fri, Oct 07, 2016, 6:17 PM UTC

syphilis2 wrote: post #10

What's wrong with the frame rate of the GIF animation? It looks silky smooth to me in Firefox.

To be fair, it's an excellent gif. The other GIFs I was testing this against were as low as 2FPS. Being able to construct a 60 or higherFPS abstracted GIF was one of the initial goals.

Re: Show HN: Vector Video

#20

Post by dandelany » Fri, Oct 07, 2016, 6:28 PM UTC

bhouston wrote: post #13

Usually people motion interpolation: https://en.wikipedia.org/wiki/Motion_interpolation There are some really perfect algorithms out there for this. And they also do upscaling via a high quality sinc filter: https://en.wikipedia.org/wiki/Whittaker%E2%80%93Shannon_inte... The main issue you have is gif artifacts from the extreme color quantization. Something like this might help: http://citeseerx.ist.psu.edu/viewdoc/d…

Yes - OpenCV is a good resource for experimenting with motion interpolation as they implement a few different algorithms: http://docs.opencv.org/2.4/modules/video/doc/motion_analysis...

I've had the most success with the Farneback algorithm. There's even a nice CLI utility called Butterflow which wraps ffmpeg+OpenCV Farneback, and allows you to interpolate video with a one-liner on the command line: https://github.com/dthpham/butterflow

Here's an example of my results applying Butterflow to satellite images from Himawari - the first half is interpolated, while the second half shows the same frames uninterpolated: https://www.youtube.com/watch?v=8knZ2-cys6M & a compilation of a few more: https://www.youtube.com/watch?v=1lPsA8J3U0Q