Opensource tool to create slowmotion videos from your footage(slowmovideo.granjow.net)
slowmovideo.granjow.net
Opensource tool to create slowmotion videos from your footage
http://slowmovideo.granjow.net/videos.html
16 comments
Is there a command line interface for this app? I'd like to batch the creation of clips using different settings and maybe make a service out of it.
What's the relationship between "optical flow" and tweening?
To find optical flow, you first pick out a collection of sample points in frame A. What constitutes a good sample point depends on your specific algorithm, although generally speaking you pick "corners". In OpenCV, you can easily do this by calling cvGoodFeaturesToTrack().
You then search for those same sample points in the successive frame B, and end up with a collection of vectors that probably represent the motion of each point. Using OpenCV, this is usually done with cvCalcOpticalFlowPyrLK().
Tweening is basically just interpolation.
You then search for those same sample points in the successive frame B, and end up with a collection of vectors that probably represent the motion of each point. Using OpenCV, this is usually done with cvCalcOpticalFlowPyrLK().
Tweening is basically just interpolation.
This is very cool, thanks for that. Can we run this on a GPU? If not, how feasible would dense optical flow running on cpu be in terms of speed to convert short non-hd videos?
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Optical Flow is a method for determining the movement between two or more frames of video. This data is then used for morphing the frames into one another, or moving the underlying vertexes of the textures from one position to the next.
The output is surprisingly good. I am impressed.
Fantastic. Now that's someone/something I would put in the "real software engineer" category. None of this web2.0 mumbojumbo.
I was kind of surprised he did not win at the swiss open source awards. Slowmo was truly the most impressive thing by far.
The results from the videos are excellent! I am truly impressed. Will try this out during the weekend.
This is quite amazing! I was thinking if you could use this application with a video based security could you reduce the amount of disk space required.
Thoughts?
I'm sure there are other applications as well
Sadly its only interpolating the motion between frames, so you don't get back any new information.
Also optical flow really doesn't handle occlusions very well, so if one thing obscures another you'll get lots of artifacts.
Also optical flow really doesn't handle occlusions very well, so if one thing obscures another you'll get lots of artifacts.
That makes me shudder. Security footage "compressed" this way wouldn't stand up in court (I hope); did the guy on the tape really do that, or did the algorithm just fill it in?
Gaaagh - there goes my weekend.
this is a beautiful piece of software! Thanks simon!
It's an impressive program. Simon deserves a lot of credit and gratitude for giving it to the world.