karasu
7th September 2013, 16:02
I made timelapses using a Gopro. The standard method is to take a picture every x seconds and then create a video from theses pictures.
I use a different approach, instead of stills, I use 25fps videos. The idea is not to drop frames when speeding up the video, but to "blend" them to achieve some kind of long exposure effect.
Currently I use Slowmo Video (http://slowmovideo.granjow.net) who compute the optical flow and let me set the shutter speed. That way I can have a nice timelapse of a place, with smooth moving clouds and people movement appearing as ghostly trails.
Slowmo is a bit of an overkill in my case, and needs Teras of disk space.
Is there another way to speed up a video by blending frames using Avisynth, ffmpeg or another similar tool ? (running under linux is a plus)
thank you.
I use a different approach, instead of stills, I use 25fps videos. The idea is not to drop frames when speeding up the video, but to "blend" them to achieve some kind of long exposure effect.
Currently I use Slowmo Video (http://slowmovideo.granjow.net) who compute the optical flow and let me set the shutter speed. That way I can have a nice timelapse of a place, with smooth moving clouds and people movement appearing as ghostly trails.
Slowmo is a bit of an overkill in my case, and needs Teras of disk space.
Is there another way to speed up a video by blending frames using Avisynth, ffmpeg or another similar tool ? (running under linux is a plus)
thank you.