The available (internal) filters are listed here and divided into categories. A short description is added, including the supported color formats (and sample types for the audio filters). There are some functions which combine two or more clips in different ways. How the video content is calculated is described for each function, but here is a summary which explains which properties that the resulting clip will have.
An alphabetical listing of the internal filters can be found here.
These filters can read media files and return an AviSynth clip. See debug filters for non-file source filters.
|AviSource / AviFileSource / OpenDMLSource||Opens an AVI file.||All|
|DirectShowSource||Opens a filename using DirectShow.||All|
|ImageReader / ImageSource / ImageSourceAnim||Reads in still or animated images. See ImageWriter.||All|
|Import||Imports an AviSynth script into the current script.||All|
|SegmentedAviSource / SegmentedDirectShowSource||Loads up to 100 avi files per argument.||All|
|WavSource||Opens a WAV file or the audio of an AVI file.||All|
Color conversion and adjustment filters
These filters can be used to change the color format or adjust the colors of a clip.
|ColorYUV||Adjusts colors and luma independently.||YUV|
|ConvertBackToYUY2||Converts a RGB clip back to YUY2.||RGB|
|ConvertToRGB||Converts to RGB32 unless clip is RGB24.||All|
|ConvertToRGB24 / ConvertToRGB32 / ConvertToYUY2 / ConvertToY8 / ConvertToYV411 / ConvertToYV12 / ConvertToYV16 / ConvertToYV24||Converts to RGB24 / RGB32 / YUY2 / Y8 / YV411 / YV12 / YV16 (planar version of YUY2) / YV24 (full YUV).||All|
|FixLuminance||Correct shifting vertical luma offset.||YUY2|
|Greyscale/Grayscale||Converts a video to greyscale (no color)||All|
|Invert||Inverts selected color channels of a video.||All|
|Levels||Scales and clamps the black and white levels, and adjusts the gamma.||All|
|Limiter||Clips levels to within CCIR-601 range, and optionally highlights pixels outside that range.||YUV|
|MergeARGB / MergeRGB||Select and combine a color channel from each of the input video clips.||All|
|MergeChroma / MergeLuma||Merge (blend) chroma or luma from one video clip into another. There is an optional weighting, so a percentage between the two clips can be specified.||YUV|
|RGBAdjust||Adjusts each color channel separately.||RGB|
|ShowAlpha / ShowRed / ShowGreen / ShowBlue||Shows the selected channel of an (A)RGB clip.||RGB|
|SwapUV||Swaps chroma channels.||YUV|
|Tweak||Adjusts the hue, saturation, brightness, and contrast.||YUV|
|UToY / UToY8 / VToY / VToY8||Copies U or V chroma plane to the Y luma plane.||YUV, except Y8|
|YToUV||Puts the luma channels of two clips as U and V channels. Luma is now 50% grey.||YUV|
Overlay and Mask filters
These filters can be used to layer clips with or without using masks and to create masks.
|ColorKeyMask||Sets the alpha-channel (similar as Mask does) but generates it by comparing the color.||RGB32|
|Layer||Puts one clip on top of another using different layer (blend) modes and variable opacity. Supports alpha-channel transparency.||RGB32, YUY2|
|Mask||Applies an alpha-mask to a clip.||RGB32|
|MaskHS||This filter returns a mask (as Y8) of clip using a given hue and saturation range.||YUV|
|Merge||Merge (blend) one video clip into another. There is an optional weighting, so a percentage between the two clips can be specified.||All|
|Overlay||Puts one clip on top of another with optional XY displacement of the overlaying image, using different overlay (blend) modes and variable opacity. Uses a separate mask clip for transparency information.||All|
|ResetMask||Applies an "all-opaque" alpha-mask to clip.||RGB32|
|Subtract||Shows the difference between the corresponding pixels of two clips.||All|
Geometric deformation filters
These filters can be used to change image size, process borders or make other deformations of a clip.
|AddBorders||Adds black or colored borders around the image.||All|
|Crop||Crops excess pixels from each frame.||All|
|CropBottom||Crops excess pixels from the bottom of each frame.||All|
|FlipHorizontal / FlipVertical||Flips the video from left to right/upside-down.||All|
|Letterbox||Blackens out (or colors out) the top and bottom (and optionally left and right) of each frame.||All|
|HorizontalReduceBy2 / VerticalReduceBy2 / ReduceBy2||Reduces the size of each frame by half horizontally, vertically or in both directions.||All|
|BicubicResize / BilinearResize / BlackmanResize / GaussResize / LanczosResize / Lanczos4Resize / PointResize / SincResize / Spline16Resize / Spline36Resize / Spline64Resize||Rescale the input video frames to an arbitrary new resolution, using different sampling algorithms.||All|
|SkewRows||Skews (or deskews) the rows of a clip.||RGB24, RGB32, YUY2, Y8|
|TurnLeft / TurnRight / Turn180||Rotates the clip 90 degrees counter-clockwise / 90 degrees clockwise.||All|
Pixel restoration filters
These filters can be used for image detail (pixel) restoration (like denoising, sharpening) of a clip.
|Blur / Sharpen||Simple 3x3-kernel blurring/sharpening filter.||All|
|GeneralConvolution||General 3x3 or 5x5 convolution matrix.||RGB32|
|SpatialSoften / TemporalSoften||Removes noise from a video clip by selectively blending pixels spatially/temporally.||YUY2 (SpatialSoften), YUV Planar|
|FixBrokenChromaUpsampling||The free Canopus DV Codec v1.00 upsamples the chroma channels incorrectly (although newer non-free versions appear to work fine). This filter compensates for it.||YUY2|
Timeline editing filters
These filters can be used to arrange frames in time (clip cutting, splicing and other editing).
|AlignedSplice / UnalignedSplice||Joins two or more video clips end to end.||All|
|AssumeFPS / AssumeScaledFPS / ChangeFPS / ConvertFPS||Changes framerate and/or video speed in different ways.||All|
|DeleteFrame||Deletes a single frame, given as an argument.||All|
|Dissolve||Like AlignedSplice, except that the clips are combined with some overlap.||All|
|DuplicateFrame||Duplicates a single frame given as an argument.||All|
|FadeIn0 / FadeIn / FadeIn2 / FadeOut0 / FadeOut / FadeOut2 / FadeIO0 / FadeIO / FadeIO2||Causes the video stream to fade linearly to black at the start or end.||All|
|FreezeFrame||Replaces all the frames between first-frame and last-frame with a selected frame.||All|
|Interleave||Interleaves frames from several clips on a frame-by-frame basis.||All|
|Loop||Loops the segment from start_frame to end_frame a given number of times.||All|
|Reverse||Makes a clip play in reverse.||All|
|SelectEven / SelectOdd||Makes an output video stream using only the even- or odd-numbered frames.||All|
|SelectEvery||Selects frames with a fixed period; a generalization of SelectEven and SelectOdd.||All|
|SelectRangeEvery||Selects a range of frames with a fixed period.||All|
|Trim||Trims a video clip so that it includes only the frames first_frame through last_frame.||All|
These filters can be used for creating and processing field-based material (which is frame-based material separated into fields). AviSynth is capable of dealing with both progressive and interlaced material. The main problem is, that it often doesn't know what it receives from source filters. This is the reason that the field-based flag exists and can be used when dealing with interlaced material. More information about field-based video can be found here.
|AssumeFrameBased / AssumeFieldBased||Forces frame-based or field-based material.||All|
|AssumeBFF / AssumeTFF||Forces field order.||All|
|Bob||Takes a clip and bob-deinterlaces it.||All|
|ComplementParity||Changes top fields to bottom fields and vice-versa.||All|
|DoubleWeave||Operates like Weave, except that it produces double the number of frames by combining both the odd and even pairs of fields.||All|
|PeculiarBlend||Blends each frame with the following frame in a peculiar way.||YUY2|
|Pulldown||Selects two out of every five frames of the source video.||All|
|SeparateColumns / SeparateRows||Separates the columns or rows of each frame into new frames.||All|
|SeparateFields||Splits each frame into its component top and bottom fields.||All|
|SwapFields||Swaps the two fields in an interlaced frame.||All|
|Weave||Combines fields together to produce interlaced frames.||All|
|WeaveColumns / WeaveRows||Takes a clip and weaves sets of columns or rows together to produce composite frames.||All|
Audio processing filters
These filters process audio. Audio samples will be automatically converted if any filters requires a special type of sample. This means that if a filter doesn't support the type of sample it is given, it will automatically convert the samples to something it supports. The internal formats supported in each filter is listed in the sample type column. A specific sample type can be forced by using the ConvertAudio functions.
automatic conversion is not performed. The new behavior is to raise an error when a sample type is not compatible. It is your responsibility to use ConvertAudio where needed.
Float audio is converted to 16 bit when frameserving through ACM, unless OPT_AllowFloatAudio is set to true. In that case the audio is kept as it is. When accessing AviSynth directly (like MeGUI, BeHappy or ffmpeg do for example), there is no automatic conversion.
The automatic conversion is done for clients that cannot handle Float audio (in the old days most of them couldn't). Note conversion takes place after the script processing is finished. Float audio is always allowed within the script.
|Amplify / AmplifydB||Amplify multiply audio samples by amount.||16 bit, Float|
|AssumeSampleRate||Adjusts the playback speed of the audio.||All|
|AudioDub / AudioDubEx||AudioDub takes the video stream from the first argument and the audio stream from the second argument and combines them. AudioDubEx is similar, but it doesn't throw an exception if both clips don't have a video or audio stream.||All|
|AudioTrim||Trims an audio clip so that it includes only the start_time through end_time.||All|
|ConvertAudioTo8bit / ConvertAudioTo16bit / ConvertAudioTo24bit / ConvertAudioTo32bit / ConvertAudioToFloat||Converts audio samples to 8/16/24/32/Float bits.||All|
|ConvertToMono||Merges all audio channels.||16 bit, Float|
|DelayAudio||Delays the audio track by second seconds.||All|
|EnsureVBRMP3Sync||Corrects out-of-sync MP3-AVI's, when seeking or trimming.||All|
|GetChannel / GetLeftChannel / GetRightChannel||Returns an audio channel from a clip.||All|
|KillAudio / KillVideo||Removes the audio or video from a clip completely.||All|
|MergeChannels||Merges channels of two audio clips.||All|
|MixAudio||Mixes audio from two clips.||16 bit, Float|
|MonoToStereo||Converts two mono signals to one stereo signal.||16 bit, Float|
|Normalize||Amplifies the entire waveform as much as possible, without clipping.||16 bit, Float|
|ResampleAudio||Performs a high-quality change of audio sample rate.||16 bit, Float|
|SuperEQ||High quality 18 band sound equalizer.||Float|
|SSRC||Very high quality sample rate conversion.||Float|
|TimeStretch||Change speed of a sound without changing the pitch, and change pitch without changing duration.||Float|
Conditional and other meta filters
Meta filters can be used to control other filters' execution. The basic characteristic of conditional filters is that their scripts are evaluated (executed) at every frame instead of when the clip is loaded. This allows for complex video processing that would be difficult or impossible to be performed by a normal AviSynth script.
|ConditionalFilter / FrameEvaluate / ScriptClip / ConditionalSelect||ConditionalFilter returns source1 if some condition is met, otherwise it returns source2. ScriptClip/FrameEvaluate returns the clip which is returned by the function evaluated on every frame. ConditionalSelect returns one frame from several sources based on an integer evaluator.||All|
|ConditionalReader||Import information from a text file, with different values for each frame - or a range of frames.||All|
|WriteFile / WriteFileIf / WriteFileStart / WriteFileEnd||These filters evaluate expressions and output the results to a text-file.||All|
|Animate / ApplyRange|| Animate is a meta-filter which evaluates another filter with continuously varying arguments.
ApplyRange 'is a special case of Animate where start_args = end_args.
|TCPServer / TCPSource||Send clips over your network. You can connect several clients to the same machine.||All|
These filters can write directly to media files.
|ImageWriter||Writes frames as images to your hard disk. See ImageReader.||All|
|BlankClip / Blackness||Produces a solid color, silent video clip of the specified length (in frames).||All|
|ColorBars / ColorBarsHD||Produce a video clip containing SMPTE colorbars scaled to any image size.||RGB32, YUY2, YV12, YV24|
|Compare||Compares two clips and prints out information about the differences.||All|
|Echo||Forces internal GetFrame calls to all input clips. Returns only first clip result.||All|
|Histogram||A multipurpose audio/video analysis tool.||All|
|Info||Prints out image and sound information.||All|
|MessageClip||Produces a clip containing a text message.||RGB32|
|Preroll||Preroll the audio or video on non-linear access.||All|
|ShowFiveVersions||Takes five video clips and combines them in a staggered arrangement from left to right.||All|
|ShowFrameNumber / ShowSMPTE / ShowTime||Draws text on every frame indicating what number AviSynth thinks it is.||All|
|StackHorizontal / StackVertical||Takes two or more video clips and displays them together in left-to-right/up-to-down order.||All|
|Subtitle||Adds anti-aliased text to a range of frames.||All|
|Tone||Generates a sound.||Float|
|Version||Generates a video clip with a short AviSynth version and copyright statement.||RGB24|
Footnote: Color Formats
The above filters work with the following named color formats.
|YUV||YUY2, YUV Planar|
|YUV Planar||YV24♦, YV16♦, YV12, YV411♦, Y8♦|
(♦ = not supported in AviSynth version 2.58 or below)