Smoothvideo

Script to smooth a video file, of lesser than 60 frames per second, to 60 frames per second using frame interpolation. It uses the free SVPflow plugins from the SmoothVideo Project over at https://www.svp-team.com/, Avisynth+, and FFMPEG. The script can be easily adjusted for more frames per second.

This script should work on AMD & nVidia GPUs. When you change GPU:1 to GPU:0, even without GPU hardware acceleration.

Works only on Windows!

More information about the SVPflow parameters https://www.svp-team.com/wiki/Manual:SVPflow

An alternative to consider for this script is https://github.com/nihui/rife-ncnn-vulkan. Your results in performance may vary depending on the hardware you use.

Installation

1. Install FFMPEG from https://ffmpeg.org/download.html. I extracted the latest ffmpeg-git-full.7z archive over at https://www.gyan.dev/ffmpeg/builds/ to C:\Apps\ffmpeg-2021-07-06-git-758e2da289-full_build. Folder is different for each daily release. This will make ffmpeg.exe available under C:\Apps\ffmpeg-2021-07-06-git-758e2da289-full_build\bin.

2. Install AviSynth+ 64-bit from https://github.com/AviSynth/AviSynthPlus/releases/. I installed AviSynthPlus_3.7.0_20210111.exe.

3. Install the FFMS AviSynth+ plugin: download FFMS https://github.com/FFMS/ffms2/releases I used ffms2-2.40-msvc.7z and copied two files ffms2.dll and ffmsindex.exe in x64 to C:\Program Files (x86)\AviSynth+\plugins64

4. Install the SVPflow AviSynth+ plugin.

   The latest version is not recommended as there will be a red border in the resulting video, see https://forum.doom9.org/showthread.php?t=181379. I downloaded first the latest svpflow-4.3.0.168.zip from https://www.svp-team.com/get/ and copied two files in svpflow1_64.dll and svpflow2_64.dll in the lib-windows\avisynth\x64 folder to the C:\Program Files (x86)\AviSynth+\plugins64 folder and after using it I found that it indeed was the case.

   But as their release notes specifically state to run their SVP Manager software to get rid of it: "Please note that SVPflow libs require a SVP Manager running (Windows and macOS only), otherwise you'll see a red rectangle around the video frame.", I used an older version instead that I have backed this up in this repository as SVPflow_LastGoodVersions.7z, and copied svpflow1.dll and svpflow2.dll in lib-windows\avisynth\x64 to the C:\Program Files (x86)\AviSynth+\plugins64 folder.

5. Download a copy of this reposity, and adjust the second line with set FFMPEG_ROOT= in smoothvideo.bat or smoothvideo_images.bat to match the FFMPEG folder and feel free to update the command line parameters for ffmpeg.exe. smoothvideo.avs and smoothvideo_images.avs contain the SVPflow parameters, including the number of FPS. These are setup for 60 FPS and the almost highest possible quality settings.

Usage

1. Smooth a video file: run smoothvideo.bat videofile_with_audio.mp4

• videofile_with_audio.mp4: take the audio from this file and smooth the video of it in the resulting video file

2. Smooth a folder of images: run smoothvideo_images.bat file_pattern start_frame stop_frame frames_per_second_original smooth_videofile.mkv videofile_with_audio_or_audiofile.mkv

• file_pattern: e.g. c:\folder\image_%d.png. It uses the ImageSource function of AviSynth+ to read the images: see http://avisynth.nl/index.php/ImageSource for details
• start_frame: first frame number e.g. 1: gets replaced with %d in the file pattern
• stop_frame: last frame number: gets replaced with %d in the file pattern
• frames_per_second_original: number of frames per second before smoothing
• smooth_videofile.mkv : resulting video file
• videofile_with_audio_or_audiofile.mp4: optional: take the audio from this file and place it in the resulting video file

It will output a temporary smoothed video file - first - without audio, ends with _smooth_no_audio.mkv, and afterwards a second file, ends with _smooth.mkv, which is smoothed and has the original audio. Note: this only works with video files that have single audio tracks.

This FFMPEG command will add two audio tracks using -map 1:a:0 -map 1:a:1 and a subtitle track -map 1:s:0 from the video.mkv file to the _smooth_no_audio.mkv file, when you need more audio tracks and subtitle tracks copied in the resulting video: ffmpeg.exe -i "video_smooth_no_audio.mkv" -i "video.mkv" -c:v copy -map 0:v:0 -map 1:a:0 -map 1:a:1 -map 1:s:0 -c:a copy "video_smooth_dualaudio.mkv"

Contents

• smoothvideo.bat script to smooth a video file, calls FFMPEG with smoothvideo.avs and re-encodes the result, and re-adds the original audio.

• smoothvideo.avs AviSynth+ script that reads a videofile using the FFMS plug-in and performs the smoothing operation.

• smoothvideo_images.bat script to smooth a series of video frames in to video file, calls FFMPEG with smoothvideo_images.avs and re-encodes the result, and adds an audio track optionally.

• smoothvideo_images.avs AviSynth+ script that reads a folder of video frames and performs the smoothing operation.

• SVPflow_LastGoodVersions.7z the last good SVPflow version.

• plugins64.zip backup of my C:\Program Files (x86)\AviSynth+\plugins64 folder.

Screenshot