Internal filters

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.

Source filters

These filters can read media files and return an AviSynth clip. See debug filters for non-file source filters.

Filter	Description	Color format
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.

Filter	Description	Color format
ColorYUV	Adjusts colors and luma independently.	YUV [8-16bit]
ConvertBackToYUY2	Converts a RGB clip back to YUY2.	RGB
ConvertToRGB	Converts to RGB32 unless clip is RGB24.	All [8bit]
ConvertToRGB24 / ConvertToRGB32	Converts to 8-bit Interleaved RGB24 / RGB32.	All [8bit]
ConvertToRGB48 / ConvertToRGB64	AVS+ Converts to 16-bit, Interleaved RGB48 / RGB64	All [16bit]
ConvertToPlanarRGB / ConvertToPlanarRGBA	AVS+ Converts to Planar RGB(A) at all bit depths	All
ConvertToYUY2	Converts to 8-bit Interleaved YUY2.	RGB24/32, YUV [8bit]
ConvertToYV24 / ConvertToYV16 / ConvertToYV12 / ConvertToY8	Converts to 8-bit Planar YV24, YV16, YV12, Y-only.	All
ConvertToYUV444 / ConvertToYUV422 / ConvertToYUV420 / ConvertToYUVA444 / ConvertToYUVA422 / ConvertToYUVA420	AVS+ Converts to Planar YUV(A) at all bit depths	All
ConvertToYUV411	AVS+ Converts to 8-bit Planar YV411	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 [8-16bit]
Limiter	Clips levels to within CCIR-601 range, and optionally highlights pixels outside that range.	YUV [8-16bit]
MergeRGB / MergeARGB	Select and combine a color channel from each of the input video clips.	All
MergeLuma / MergeChroma	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 [8-16bit]
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.

Filter	Description	Color format
ColorKeyMask	Sets the alpha-channel (similar as Mask does) but generates it by comparing the color.	RGB32; RGB64 [+], All Planar RGB [+]
Layer	Puts one clip on top of another using different layer (blend) modes and variable opacity. Supports alpha-channel transparency.	YUY2, RGB32; RGB64 [+]
Mask	Applies an alpha-mask to a clip.	RGB32; RGB64 [+], All Planar RGB [+]
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 except YV411
ResetMask	Applies an "all-opaque" alpha-mask to clip.	RGB32; RGB64 [+], All Planar RGB [+]
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.

Filter	Description	Color format
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.

Filter	Description	Color format
Blur / Sharpen	Simple 3x3-kernel blurring/sharpening filter.	All
GeneralConvolution	General 3x3 or 5x5 convolution matrix.	RGB32
SpatialSoften	Removes noise from a video clip by selectively blending pixels spatially.	YUY2
TemporalSoften	Removes noise from a video clip by selectively blending pixels temporally.	YUV Planar All except RGB24/48 [+]
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).

Filter	Description	Color format
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

Interlace filters

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.

Filter	Description	Color format
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.

AVS+ 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.

Filter	Description	Sample type
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.

Filter	Description	Color format
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.	All
TCPServer / TCPSource	Send clips over your network. You can connect several clients to the same machine.	All

Export filters

These filters can write directly to media files.

Filter	Description	Color format
ImageWriter	Writes frames as images to your hard disk. See ImageReader.	All

Debug filters

Filter	Description	Color format
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

Footnotes

The above filters work with the following named color formats.

Name	Formats
All	RGB, YUV (detailed below)
RGB Interleaved	RGB24, RGB32 [8bit] RGB48, RGB64 [16bit] [+]
RGB Planar	RGBP8, RGBAP8, RGBP10, RGBAP10 etc [+]
YUV	YUY2 Interleaved, YUV Planar, YUVA Planar [+]
YUV Planar	YV12, YV24‡, YV16‡, YV411‡, Y8‡  YUV444P8, YUV444P10, YUV444P12 etc [+]
YUVA Planar	YUVA444P8, YUVA444P10, YUVA444P12 etc [+]

Notes and exceptions.
‡	Not supported in AviSynth version 2.58 or below
[+]	AviSynth+ color space only (Deep Color, Planar RGB, YUVA).
[8bit]	8-bit only [+]
[16bit]	16-bit only [+]
[8-16bit]	8, 10, 12, 14, 16 bit (excludes 32-bit floating-point) [+]
AVS+	AviSynth+ filter only.