how to sample singel frames (every few minutes)from a movie?

[tkamin]

Hi!
i have a movie of a few hours which i wanna change into a very shorter video by sampling every few seconds or even minutes (something like a security cam) i only need a frame every few seconds? how can i do it?
can i get the output as a movie, or just still pictures?

thanks,
Tzvika

[BJ_M]

use decimate in virtualdub or avisynth ..


you can chop it and decimate the number of frame to any amount

[BJ_M]

in virtualdub, it it listed under 'frame rate'

[tkamin]

thanks, it does the job but not the way i intended.. it leaves the movie in it's original length simply changing it's fps - i need to also reduce the movie's lenght - keeping the same fps... ?

[celtic_druid]

Try AVISynth's selectevery() filter. You could also add assumefps(original fps) after your other filter.

[BJ_M]

thanks, it does the job but not the way i intended.. it leaves the movie in it's original length simply changing it's fps - i need to also reduce the movie's lenght - keeping the same fps... ?

no no -- use decimate

[tkamin]

i did exactly that - decimated by a 100 and got a file exactly the same time length with each frame "freezing or about 4 seconds - than it jumps 100 frames forward... is that option suppose to also shorten the movie time ?

[BJ_M]

you didnt encode it yet -- just trying to watch it in vdub ..

save it out as a new file