Introduction:

InterFrame is an AviSynth script.
Its main use is to give videos higher framerates like newer TVs do. Common names are framedoubling, smooth motion, HFR (high framerate) and 60FPS conversion.
High framerate (HFR at 48fps) was used in The Hobbit and will be used in upcoming films like the Avatar sequels, which will use HFR at 60fps, so why not watch all your movies at higher framerates?

Download:

Examples:

Here is a before and after video comparison:
Original File
InterFrame (default settings with GPU=true)

Code Samples:

Here is a sample of what the AviSynth script could look like.
It shows the recommended syntax and should be used with SET’s AviSynth 2.6 build from here.

Cores=4
SetMemoryMax(512)
SetMTMode(3, Cores)
LoadPlugin("svpflow1.dll")
LoadPlugin("svpflow2.dll")
Import("InterFrame2.avsi")
dss2("video.mkv", fps=23.976).ConvertToYV12()
SetMTMode(2)
InterFrame(Cores=Cores)

Description:

Dependencies are included in the download.

To use it in your script just call the function InterFrame(Cores=x) (replacing the path with the path to the flow DLL files) and it will automatically choose a good framerate and preset for you.
There are more specifics like optional parameters and examples on this page, which is also included in the download.

There is also a complete guide on how to use it for those with no knowledge about any of this stuff here.
If you have any questions about it please check the guide first, there is a FAQ section and everything 🙂

Changelog:

21/05/2015 – 2.8.2:

• Updated to SVPflow 1.1.15, which increased speed (thanks, SVP!)

02/05/2015 – 2.8.1:

• Updated to SVPflow 1.1.14, which increased speed by up to 15% (thanks, SVP!)

10/03/2015 – 2.8.0.1:

• Updated to SVPflow 1.1.13, which fixed the unused SVConvert function (thanks, SVP!)

05/03/2015 – 2.8.0:

• Updated SVP libraries (thanks, SVP!) which:
  • Increased speed by up to 20%
  • Reduced memory usage
  • Removed 2 dependencies (from 4 to 2)
• Updated documentation

03/01/2015 – 2.7.0:

• Added “fastest” preset, for even more speed but lower quality.

09/09/2014 – 2.6.0:

• Added new boolean option “FrameDouble”, which when set to “true” will always double the framerate of the input video, unless NewNum is greater than 0.
• Updated the “Recommended” script in the documentation

11/05/2014 – 2.5.2:

• Updated SVP libraries (thanks, SVP!) which:
  • Improved quality
  • Fixed bugs

16/12/2013 – 2.5.1:

• Minor code cleanup
• Updated SVP libraries (thanks, SVP!) which:
  • Improved quality
  • Improved GPU support
  • Fixed bugs

18/02/2013 – 2.5.0:

• Minimized artifacts (thanks, Widezu69!)
• Made motion smoother by default (only in GPU mode)
• Updated libraries which improve scene-change detection, thanks to SVP

24/01/2013 – 2.4.0:

• Updated libraries which improve scene-change detection, thanks to SVP

16/01/2013 – 2.4.0 RC1:

• Fixed the presets Weak and Faster when not using GPU (thanks, Motenai Yoda!)
• Fixed the Animation tuning (thanks, HolyWu!)

11/01/2013 – 2.4.0 Beta 1:

• The “Medium” preset is back to what it was in 2.2.0
• The “Fast” preset is the same as “Medium” was in 2.3.0
• The new “Faster” preset is the same as “Fast” was in 2.3.0
• The “Animation” tuning has been changed a lot based on SVP recommendations
• The “Weak” tuning has been changed a lot based on widezu69’s recommendations
• The “Smooth” tuning is smoother

24/12/2012 – 2.3.0:

• Increased speed
• Decreased blobs/artifacts in high-action scenes
• Updated libraries which optimise memory use and support more video cards, thanks to SVP

13/11/2012 – 2.2.0:

• Fixed a syntax bug that appears to have had little-to-no effect (thanks to HolyWu for reporting it).
• Tweaked scene-change detection again (tightened this time to improve artifacts).

27/06/2012 – 2.1.0:

• Improved smoothness in high-action scenes by loosening scene-change detection.

05/06/2012 – 2.0.2:

• Better interpolation stability.
• Supports more video cards.
• Better compatibility with AviSynth 2.6.
• Thanks to SVP.

05/05/2012 – 2.0.1:

• Updated libraries to support new video cards like GTX 680, thanks to SVP.

03/05/2012 – 2.0:

• Updated libraries, thanks to SVP.

17/04/2012 – 2.0 RC1:

• Updated libraries, thanks to SVP.

12/04/2012 – 2.0b4:

• Reduced instances of warping by fixing usage of SAD mask, thanks to Bernardd for reporting the bug.
• Further reduced instances of warping by lowering area_sharp (sadgamma).

11/04/2012 – 2.0b3:

• Updated libraries, thanks to SVP.
• Changed some fields from string to int (NewNum, NewDen, OverrideAlgo and OverrideArea).

30/03/2012 – 2.0b2:

• Updated libraries, thanks to SVP.
• Fixed 3D modes.
• Fixed “overlap must be even” error.

24/03/2012 – 2.0b1:

• Rewrite which no longer uses MVTools2 and has better quality and is faster.

23/03/2012 – 1.14:

• Allow any value for OverrideAlgo.
• Lots of documentation updates.

29/02/2012 – 1.13:

• Added the “OverrideAlgo” option for users who wants to override the recommended algo value.
• Added the “OverrideSadML” option for users who wants to override the recommended sadml value.
• Updated FFTW to 3.3.1 from 3.2.2.
• Updated MVTools2 (SVP Build) to 2.5.11.9 from 2.5.11.8, thanks to SVP.
• Updated libflowgpu to 1.2.7 from 1.2.6, thanks to SVP.

31/12/2011 – 1.12.3:

• Updated libflowgpu to 1.2.6 from 1.2.5 which improves ATI GPU compatibility, thanks to SVP.
• Code reshuffle (no changes)

03/11/2011 – 1.12.2:

• Updated MVTools2 (SVP Build) to 2.5.11.8 from 2.5.11.7 which improves speed by 2-15%, thanks to SVP.

16/09/2011 – 1.12.1:

• Updated MVTools2 (SVP Build) to 2.5.11.7 from 2.5.11.6 which synchronises the build with the official 2.5.11.2 beta release.
• Updated libflowgpu to 1.2.5 from 1.2.0 which improves GPU compatibility, thanks to SVP.

12/09/2011 – 1.12:

• Improved some warping.
• Added new UltraSmooth tuning and changed the Smooth tuning. Smooth now has more error-correction than before, while UltraSmooth is roughly what Smooth was before.

05/07/2011 – 1.11:

• Increased quality of all presets. This change makes fast panning less smooth, but also decreases errors in general.
• Fixed bug with Placebo preset (thanks to Alek93j and Gavino).

18/06/2011 – 1.10:

• Increased quality of all presets. Thanks to DeathTheSheep for collaborating.
• Increased speed of “Ultra Fast” and “Super Fast” presets.
• “Animation” tuning is now much better and recommended for cartoon/anime inputs.
• What used to be the “Animation” tuning is now called “Weak”.

23/05/2011 – 1.9:

• Added support for 2 more types of 3D inputs (Half-SBS and Half-Over-Under).

20/05/2011 – 1.8.1:

• Fixed stuttering motion particularly visible in cartoons.

04/05/2011 – 1.8:

• Improved support for 2 types of 3D content – SBS (Side-By-Side) and OU (Over-Under), AKA Top-to-Bottom. This new feature is controlled by the new parameter InputType.

30/04/2011 – 1.7.1:

• Increased the speed by roughly 40%, thanks to SVP

28/04/2011 – 1.7:

• Increased the quality of all presets

20/04/2011 – 1.6:

• Updated libflowgpu from 1.1 to 1.2 which improves the quality of GPU=true mode, thanks to SVP
• Added more presets (“Faster” and “Super Fast”) based on some realtime user’s suggestions, so now there is a smoother step between presets

13/04/2011 – 1.5.2:

• Set GPU=false by default instead of true, because of slight quality loss with GPU=true

13/04/2011 – 1.5.1:

• Fixed bug with GPU=false mode

11/04/2011 – 1.5:

• Improved the quality of the default, Fast and Placebo presets
• It now checks for the existence of the mandatory value for FlowPath and displays an alert if it isn’t defined
• Added the GPU parameter (true for GPU-acceleration, false for CPU-only)

10/04/2011 – 1.4:

• Added custom mvtools2 and GPU-acceleration thanks to SVP
• Improved the quality of all presets
• Updated the sample videos in this post

01/04/2011 – 1.3.1:

• Added input validation for Tuning and Preset values with descriptive error messages

30/03/2011 – 1.3:

• Added new Tuning value called Smooth
• Improved detection of scene-changes

24/03/2011 – 1.2:

• Renamed Fast preset to Ultra Fast
• Added Very Fast and Fast presets
• Increased quality of Placebo and Medium presets
• Added Tuning variable
• Improved detection of scene-changes
• Added the file dependencies to the download since a couple of them were confusing some people
• Added links to the dependency websites in the help file

22/03/2011 – 1.1:

• Renamed Quality preset to Medium (default)
• Renamed Speed preset to Fast
• Increased quality of Medium (default) preset
• Added Placebo preset (little quality gain with big performance hit, not recommended)
• RemoveGrain is now required for Medium (default) preset
• EEDI2 is required for Placebo preset

21/03/2011 – 1.0.2:

• Increased speed of both presets

20/03/2011 – 1.0.1:

• Slightly faster
• Scene-changes no longer fade/blend

17/03/2011 – 1.0:

• Initial release