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description=VapourSynth is an application for video manipulation. Or a plugin. Or a library. It’s hard to tell because it has a core library written in C++ and a Python module to allow video scripts to be created.;

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linux, vapoursynth, introduction, installation, previewing, output, source, filters, microsoft, windows, arch, other, lsmashsource, ffms2, bestsource,

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vapoursynth codec wiki skip to main content codec wiki get started blog introduction audio ️ video data ️ images encoders hardware encoders subtitles ️ filtering vapoursynth basics of filtering inverse telecine deinterlace decombing stabilizing denoise dehalo antialiasing deband graining colorimetry ️ utilities ️ metrics ️ video players ️ resources ️ contribution guide faq privacy policy terms of use ️ filtering vapoursynth on this page vapoursynth vapoursynth is an application for video manipulation or a plugin or a library it s hard to tell because it has a core library written in c and a python module to allow video scripts to be created fredrik mellbin creator of vapoursynth introduction in the realm of video processing one will frequently encounter media with various quality issues these can range from minor imperfections to significant degradation including excessive film grain or noise that significantly increases bitrate due to its unpredictable nature visible banding artifacts unwanted halos around objects interlacing issues in older unrestored footage telecine artifacts from improper film to video conversion and more on our video artifacts page to address these challenges video filtering techniques are employed currently there are three primary software frameworks used for video filtering ffmpeg vapoursynth avisynth vapoursynth is designed as a 21st century upgrade and rewrite of avisynth which was originally created by ben rudiak gould edwin van eggelen klaus post richard berg and ian brabham in may 2000 one of the most attractive features of this complete rewrite is its improved multithreading capability an area where avisynth struggled due to its aging infrastructure some longtime avisynth users are reluctant to switch to vapoursynth preferring to stick with a familiar workflow there is nothing wrong with this preference as both tools have their merits in video processing that being said the codec wiki s filtering section focuses primarily on vapoursynth and occaisonally ffmpeg it is important to note that working with vapoursynth requires a basic understanding of python as the filtering process involves scripting installation microsoft windows at the time of writing python 3 12 is required this will change in the future so consult from their website download the installer exe unless you require portability install it arch linux currently arch is the best linux distribution for working with vapoursynth due to the fact that the vast majority of filters and plugins are available in the aur this makes installing and updating filters easy if you are not already we recommend using an aur helper such as paru or yay to install vapoursynth simply install the vapoursynth package from the official repositories using pacman or your preferred aur helper plugins are all prefixed with vapoursynth plugin such as vapoursynth plugin lsmashsource git and as such can be discovered easily other linux vapoursynth is supported on all linux distributions installation methods may vary by distribution contributions would be helpful to provide instructions for more distributions previewing there are currently two leading previewers for vapoursynth if you want to preview your scripts with capabilities such as seeking you will need to use one of these applications the first is yomkior s vapoursynth editor which includes a built in code editor alongside a video previewer this makes it extremely easy to set up for users who are new to vapoursynth the second is vsview which is a standalone previewer with utilities for tasks such as cropping screenshotting and uploading comparisons it provides the option of an embedded monaco based code editor and integrated python environment this tool is more advanced than vapoursynth editor output vapoursynth provides a command line utility called vspipe for outputting filtered video using this utility to pipe y4m video is the most common way to use vapoursynth with an encoder for example the following command would pipe the output from a vapoursynth script into x264 vspipe c y4m input vpy x264 demuxer y4m o output mkv source filters for vapoursynth to produce output it has to load a video in some way this way is with source filters the most basic method is using blankclip to create a clip of a certain resolution and frame rate for example the following script would give us a blank clip at 640x480 import vapoursynth as vs core vs core clip core std blankclip width 640 height 480 clip set_output 0 but a plain black video isn t very useful is it we want to load real videos so we can do filtering on them for this there are a few different source filters we can look at lsmashsource lsmashsource is a source filter using lsmash as the underlying source library it is the most commonly used source filter and is generally reliable for most source formats though may have frame accuracy issues when seeking with certain input formats such as vc 1 if this is a concern it can be recommended to encode to lossless first before using any encoding methods that require seeking such as av1an here is an example of loading a video file using lsmashsource import vapoursynth as vs core vs core clip core lsmas lwlibavsource source input mkv clip set_output 0 ffms2 ffms2 is a source filter based on ffmpeg it generally should give the same results as lsmashsource especially when using the git version which has fixed support for newer formats such as av1 if having issues with a source file with lsmashsource ffms2 can be a good fallback to try import vapoursynth as vs core vs core clip core ffms2 source source input mkv clip set_output 0 bestsource bestsource is also based on ffmpeg but uses additional techniques to ensure frame accuracy in all scenarios with all input formats the downside is that it must decode the entire video during indexing which means the first load of a given video will take longer subsequent loads will be quick because bestsource caches the index in a file import vapoursynth as vs core vs core clip core bs videosource source input mkv cachepath clip set_output 0 we add the cachepath setting to emulate the behavior of the other source filters which is to place the index file next to the source video this helps with portability and cleaning up after ourselves the default behavior is to place the index file in a temporary directory local to the machine edit this page previous webvtt next basics of filtering installation microsoft windows arch linux other linux previewing output source filters lsmashsource ffms2 bestsource getting started prologue aac filtering vapoursynth deband denoise more contribute terms of use privacy policy copyright 2026 gianni rosato contributors content licensed under cc by sa 4 0 built with docusaurus