Convert Framerate WITHOUT interpolation

YaBoyShredderson · 22nd February 2021, 21:20

im using staxrip to convert some variable framerate footage from my phone to constant framerate prores to be edited, but i cant work out how to change the framerate without interpolation? all i want to do is convert the framerate without changing the runtime. if i convert using x264/5 and change the frame rate in those settings, it just speeds up/slows down the footage. with prores, there is no framerate setting, so i have to use avs. I click on framerate, click on convertFPS and then select what i want it to be, but it interpolates to that framerate, i realised when i read the readme in the files for staxrip. how do i get to change the framerate without interpolation? handbrake can do it, but not to prores.

poisondeathray · 22nd February 2021, 21:25

ChangeFPS will duplicate or drop frames to achieve the desired framerate without changing the run time (rounded to nearest frame because you can't have fractional frames)

(ie.. the interpolation is duplicating frames instead of blending frames)

Sometimes the source filter can be used to do this as well (e.g. ffvideosource, fpsnum, fpsden)

YaBoyShredderson · 22nd February 2021, 21:36

Quote:

Originally Posted by poisondeathray

ChangeFPS will duplicate or drop frames to achieve the desired framerate without changing the run time (rounded to nearest frame because you can't have fractional frames)

(ie.. the interpolation is duplicating frames instead of blending frames)

Sometimes the source filter can be used to do this as well (e.g. ffvideosource, fpsnum, fpsden)

I have no idea how to use avs in staxrip, what do i need to put into the avs window to get the desired result? There is no change fps option.

StainlessS · 22nd February 2021, 22:07

It kinda depends a bit upon your script, and target rate.

Code:

ChangeFPS(25.0)                 # 25 FPS, with default special un-named implicit Last clip as source, implied assign result to special Last clip
ChangeFPS(24000,1001)           # 23.976 FPS (numerator,denominator)
# ...
src.ChangeFPS(25.0)             # 25 FPS, with named source clip,  implied assign result to special Last clip
src.ChangeFPS(24000,1001)       # 23.976 FPS (numerator,denominator)
# ...
dst = src.ChangeFPS(25.0)       # 25 FPS, with named source clip, and assign to dest clip
dst = src.ChangeFPS(24000,1001) # 23.976 FPS (numerator,denominator)

ChangeFPS() on Wiki
http://avisynth.nl/index.php/FPS

Wiki Main Page:- http://avisynth.nl/index.php/Main_Page

YaBoyShredderson · 22nd February 2021, 22:14

Quote:

Originally Posted by StainlessS

It kinda depends a bit upon your script, and target rate.

Code:

ChangeFPS(25.0)                 # 25 FPS, with default special un-named implicit Last clip as source, implied assign result to special Last clip
ChangeFPS(24000,1001)           # 23.976 FPS (numerator,denominator)
# ...
src.ChangeFPS(25.0)             # 25 FPS, with named source clip,  implied assign result to special Last clip
src.ChangeFPS(24000,1001)       # 23.976 FPS (numerator,denominator)
# ...
dst = src.ChangeFPS(25.0)       # 25 FPS, with named source clip, and assign to dest clip
dst = src.ChangeFPS(24000,1001) # 23.976 FPS (numerator,denominator)

ChangeFPS() on Wiki
http://avisynth.nl/index.php/FPS

Wiki Main Page:- http://avisynth.nl/index.php/Main_Page

Im using staxrip, which uses avisynth. I dont know how to write dcripts or anything like that. I only click and add the stuff i want in the box that says avs box.

StainlessS · 22nd February 2021, 22:19

Well as I still have less idea than you about what you are doing [ie what framerate are you aiming at],
try either the first or 2nd optional lines given [altering for your target rate], if whole number of FPS, then 1st one, else 2nd.
EDIT:
If 29.97, then

Code:

ChangeFPS(30000,1001)  # 29.97 is not the exact number, numerator,denominator provides as near as possible.

EDIT: or if 59.94 then

Code:

ChangeFPS(60000,1001)  # 59.94 [59.94005994005994005994005994005994005994005994005994005994 ... 005994 ... ]

YaBoyShredderson · 22nd February 2021, 22:30

Quote:

Originally Posted by StainlessS

Well as I still have less idea than you about what you are doing [ie what framerate are you aiming at],
try either the first or 2nd optional lines given [altering for your target rate], if whole number of FPS, then 1st one, else 2nd.
EDIT:
If 29.97, then

Code:

ChangeFPS(30000,1001)  # 29.97 is not the exact number, numerator,denominator provides as near as possible.

I think i worked it out. I tested with 24000/1001 source converted to 60000/1001, and i went into vlc and checked frame by frame, and it appears to be doing a 3:2 pulldown, which means its not interpolating like before. I wouldnt do this conversion in real life, but it was an easy test. Thanks.

StainlessS · 22nd February 2021, 22:32

Oh good, as an afterthought I added that too [59.94].
Glad you got it sorted.

EDIT: You can put

Code:

Info

at the end to see what the result is.

22nd February 2021, 21:20	#1 \| Link
YaBoyShredderson Registered User Join Date: Jul 2020 Posts: 76	Convert Framerate WITHOUT interpolation im using staxrip to convert some variable framerate footage from my phone to constant framerate prores to be edited, but i cant work out how to change the framerate without interpolation? all i want to do is convert the framerate without changing the runtime. if i convert using x264/5 and change the frame rate in those settings, it just speeds up/slows down the footage. with prores, there is no framerate setting, so i have to use avs. I click on framerate, click on convertFPS and then select what i want it to be, but it interpolates to that framerate, i realised when i read the readme in the files for staxrip. how do i get to change the framerate without interpolation? handbrake can do it, but not to prores.

22nd February 2021, 22:07	#4 \| Link
StainlessS HeartlessS Usurer Join Date: Dec 2009 Location: Over the rainbow Posts: 10,669	It kinda depends a bit upon your script, and target rate. Code: ChangeFPS(25.0) # 25 FPS, with default special un-named implicit Last clip as source, implied assign result to special Last clip ChangeFPS(24000,1001) # 23.976 FPS (numerator,denominator) # ... src.ChangeFPS(25.0) # 25 FPS, with named source clip, implied assign result to special Last clip src.ChangeFPS(24000,1001) # 23.976 FPS (numerator,denominator) # ... dst = src.ChangeFPS(25.0) # 25 FPS, with named source clip, and assign to dest clip dst = src.ChangeFPS(24000,1001) # 23.976 FPS (numerator,denominator) ChangeFPS() on Wiki http://avisynth.nl/index.php/FPS Wiki Main Page:- http://avisynth.nl/index.php/Main_Page __________________ I sometimes post sober. StainlessS@MediaFire ::: AND/OR ::: StainlessS@SendSpace "Some infinities are bigger than other infinities", but how many of them are infinitely bigger ???

22nd February 2021, 22:19	#6 \| Link
StainlessS HeartlessS Usurer Join Date: Dec 2009 Location: Over the rainbow Posts: 10,669	Well as I still have less idea than you about what you are doing [ie what framerate are you aiming at], try either the first or 2nd optional lines given [altering for your target rate], if whole number of FPS, then 1st one, else 2nd. EDIT: If 29.97, then Code: ChangeFPS(30000,1001) # 29.97 is not the exact number, numerator,denominator provides as near as possible. EDIT: or if 59.94 then Code: ChangeFPS(60000,1001) # 59.94 [59.94005994005994005994005994005994005994005994005994005994 ... 005994 ... ] __________________ I sometimes post sober. StainlessS@MediaFire ::: AND/OR ::: StainlessS@SendSpace "Some infinities are bigger than other infinities", but how many of them are infinitely bigger ??? Last edited by StainlessS; 22nd February 2021 at 22:30.

22nd February 2021, 22:32	#8 \| Link
StainlessS HeartlessS Usurer Join Date: Dec 2009 Location: Over the rainbow Posts: 10,669	Oh good, as an afterthought I added that too [59.94]. Glad you got it sorted. EDIT: You can put Code: Info at the end to see what the result is. __________________ I sometimes post sober. StainlessS@MediaFire ::: AND/OR ::: StainlessS@SendSpace "Some infinities are bigger than other infinities", but how many of them are infinitely bigger ??? Last edited by StainlessS; 22nd February 2021 at 22:53.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

22nd February 2021, 21:25	#2 \| Link
poisondeathray Registered User Join Date: Sep 2007 Posts: 5,216	ChangeFPS will duplicate or drop frames to achieve the desired framerate without changing the run time (rounded to nearest frame because you can't have fractional frames) (ie.. the interpolation is duplicating frames instead of blending frames) Sometimes the source filter can be used to do this as well (e.g. ffvideosource, fpsnum, fpsden)