Can anyone explain 'key frame spacing' to me?
Posted: Wed Aug 27, 2014 1:44 am
ok im actually having this problem in adobe premiere pro but because no one over there has any idea wtf is going on, im going to ask here where i've had lots better help in the past.
my source is a video encoded in mp4, and i'm just exporting bits and chunks, and i noticed that (especially on parts where there are lasting stills) you can see the video pulse every couple seconds or so.
the rate at which the pulses occur seems to depend on how high or low i set the key frame distance in the advance settings.
from what i was able to understand, setting the keyframe distance tells it where to re-evaluate and when to start adding new information (?)
I ended up settling on a key frame distance of 90. and thats only because some who was helping another had posted a picture of his export settings, and his keyframe distance was 90. so i set mine to 90 like his, and now it made those pulses stop showing up.
the problem is now i understand i totally have almost no understanding of how spacing of keyframes work. i thought at first maybe it had something to do with frame rate but now since this experience with it making the screen pulse with long, still, panning images, i now have no idea.
here is an example, on unlisted youtube vids. the pulses start at around 45 seconds when the credits start with the still images.
If u raise the quality to 720 its easier to see.
https://www.youtube.com/watch?v=sC5jj4Hujbk
(fixed with keyframes set to spaced at 90 frames)
https://www.youtube.com/watch?v=Vm50AZb ... e=youtu.be
and here is a screen cap of my export settings, you can see the options for key frame spacing near the bottom.
also im really sorry about asking about this on a forum for handbrake but i would think this should be relatable all in some way.
any explanation as to how exactly spacing keyframes affects the video or how to determine the appropriate spacing would be very helpful.
thanks
my source is a video encoded in mp4, and i'm just exporting bits and chunks, and i noticed that (especially on parts where there are lasting stills) you can see the video pulse every couple seconds or so.
the rate at which the pulses occur seems to depend on how high or low i set the key frame distance in the advance settings.
from what i was able to understand, setting the keyframe distance tells it where to re-evaluate and when to start adding new information (?)
I ended up settling on a key frame distance of 90. and thats only because some who was helping another had posted a picture of his export settings, and his keyframe distance was 90. so i set mine to 90 like his, and now it made those pulses stop showing up.
the problem is now i understand i totally have almost no understanding of how spacing of keyframes work. i thought at first maybe it had something to do with frame rate but now since this experience with it making the screen pulse with long, still, panning images, i now have no idea.
here is an example, on unlisted youtube vids. the pulses start at around 45 seconds when the credits start with the still images.
If u raise the quality to 720 its easier to see.
https://www.youtube.com/watch?v=sC5jj4Hujbk
(fixed with keyframes set to spaced at 90 frames)
https://www.youtube.com/watch?v=Vm50AZb ... e=youtu.be
and here is a screen cap of my export settings, you can see the options for key frame spacing near the bottom.
also im really sorry about asking about this on a forum for handbrake but i would think this should be relatable all in some way.
any explanation as to how exactly spacing keyframes affects the video or how to determine the appropriate spacing would be very helpful.
thanks