## Source filters for producing a clip

AVISource / OpenDMLSource / AVIFileSource / WAVSource | AVISource takes as argument one or more file name in quotes and opens the file.
DirectShowSource | DirectShowSource reads filename using DirectShow
SegmentedAVISource / SegmentedDirectShowSource | The SegmentedAVISource filter automatically loads up to 100 avi files per argument
BlankClip / Blackness | The BlankClip filter produces a solid color, silent video clip of the specified length (in frames).
ImageReader / ImageSource | This filter produces a video clip by reading in still images.
Import | Import an AviSynth script into the current script

## Filters for image processing

AddBorders | AddBorders adds black borders around the image.
Blur / Sharpen | These are simple 3x3-kernel blurring and sharpening filters.
ColorYUV | Adjusts colors and luma independently.
ConvertToRGB / ConvertToYUY2 / ConvertToYV12 / ConvertBackToYUY2 ConvertToRGB32 / ConvertToRGB24 | AviSynth can deal internally with four color formats, RGB24, RGB32, YUY2 and YV12. These filters convert between them.
Crop / CropBottom | Crop crops excess pixels off of each frame.
GeneralConvolution | General 3x3 or 5x5 convolution matrix.
Greyscale | Converts a video to greyscale.
Invert | Inverts selected color channels of a video.
Layer / Mask / ResetMask / ColorKeyMask | Layering two videos.
Letterbox | Letterbox simply blackens out the top and the bottom and optionally left and right side of each frame.
Levels | The Levels filter scales and clamps the blacklevel and whitelevel and adjusts the gamma.
Limiter | A filter for clipping levels to within CCIR-601 range.
Overlay | Overlay puts two clips on top of each other with an optional displacement of the overlaying image, and using different overlay methods. Furthermore opacity can be adjusted for the overlay clip.
MergeARGB / MergeRGB | This filter makes it possible to select and combine a color channel from each of the input videoclips.
Merge / MergeChroma / MergeLuma | This filter makes it possible to merge luma, chroma or both from a videoclip into another. There is an optional weighing, so a percentage between the two clips can be specified.
ReduceBy2 / HorizontalReduceBy2 / VerticalReduceBy2 | ReduceBy2 reduces the size of each frame by half.
BilinearResize / BicubicResize / LanczosResize / Lanczos4Resize / PointResize | The Resize filters rescale the input video frames to an arbitrary new resolution, using different sampling algorithms.
RGBAdjust | Adjust each color channel seperately.
ShowAlpha / ShowRed / ShowGreen / ShowBlue | Shows the selected channel of an (A)RGB clip.
SpatialSoften / TemporalSoften | The SpatialSoften and TemporalSoften filters remove noise from a video clip by selectively blending pixels.
SwapUV / UToY / VToY / YToUV | Swaps/copies chroma channels of a clip.
Tweak | Adjust the hue, saturation, brightness, and contrast.

## Filters for Editing

AlignedSplice / UnalignedSplice | AlignedSplice and UnalignedSplice join two or more video clips end to end.
AssumeFPS / ChangeFPS / ConvertFPS | Changes framerates in different ways.
DeleteFrame | DeleteFrame deletes a single frame, given as an argument.
Dissolve | Dissolve is like AlignedSplice, except that the clips are combined with some overlap.
DuplicateFrame | DuplicateFrame duplicates a single frame given as an argument.
FadeIn0 / FadeOut0 / FadeIn / FadeOut / FadeIn2 / FadeOut2 / FadeIO0 / FadeIO / FadeIO2 | FadeIn and FadeOut cause the video stream to fade linearly to black at the start or end.
FreezeFrame | The FreezeFrame filter replaces all the frames between first-frame and last-frame with a selected frame.
Loop | Loops the segment from start frame to end frame a given number of times.
SelectEven / SelectOdd | SelectEven makes an output video stream using only the even-numbered frames
SelectEvery | SelectEvery is a generalization of filters like SelectEven and Pulldown.
SelectRangeEvery | This filters selects a range of frames with a certain period.
Trim | Trim trims a video clip so that it includes only the frames first-frame through last-frame.

## Filters for treating interlaced video

Currently (v2.5x and older versions), AviSynth has no interlaced flag which can be used for interlaced video. There is a fieldbased flag, but contrary to what you might expect, this flag is not related to interlaced video. In fact, all video (progressive or interlaced) is framebased, unless you use AviSynth filters to change that. There are two filters who turn framebased video into fieldbased video: SeparateFields and AssumeFieldBased. More information about fieldbased video can be found here.

AssumeFrameBased / AssumeFieldBased AssumeTFF / AssumeBFF ComplementParity | Avisynth keeps track of whether a given clip is field-based or frame-based... Force field order. ComplementParity changes top fields to bottom fields and vice-versa.
Bob | Bob takes a clip and bob-deinterlaces it
DoubleWeave | The DoubleWeave filter operates like Weave, except that it produces double the number of frames by combining both the odd and even pairs of fields.
Interleave | Interleave interleaves frames from several clips on a frame-by-frame basis.
Pulldown | The Pulldown filter simply selects two out of every five frames of the source video.
SeparateFields | SeparateFields takes a frame-based clip and splits each frame into its component top and bottom fields.
SwapFields | The SwapFields filter swaps the two fields in an interlaced frame
Weave | Weave takes even pairs of fields from a Fields Separated input video clip and combines them together to produce interlaced frames.

## Audio filters

Prior to v2.5 the audio samples are converted to 16 bits when using one of these audio filters.
Starting from v2.5 the audio samples will be automatically converted if any filters requires a special type of sample. This means that most filters will accept several types of input, but if a filter doesn't support the type of sample it is given, it will automatically convert the samples to something it supports.
In general this shouldn't concern the average user. A specific sample type can be forced by using the ConvertAudio functions.
If the sample type is float, when AviSynth has to output the data, it will be converted to 16 bit, since float cannot be passed as valid AVI data.

Amplify / AmplifydB | Amplify multiply audio samples by amount.
AssumeSampleRate | Adjusts the playback speed of the audio.
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.
ConvertToMono | Merges all audio channels.
ConvertAudioTo8bit / ConvertAudioTo16bit / ConvertAudioTo24bit / ConvertAudioTo32bit / ConvertAudioToFloat | Converts audio samples to 8, 16, 24, 32 bits or float.
DelayAudio | DelayAudio delays the audio track by seconds seconds.
EnsureVBRMP3Sync | Corrects out-of-sync mp3-AVI's, when seeking ot trimming.
GetChannel | Returns a channel from an audio signal.
KillAudio | Removes the audio from a clip completely.
MergeChannels | Merges channels of two or more audio clips.
MixAudio | Mixes audio from two clips.
Normalize | Amplifies the entire waveform as much as possible, without clipping.
ResampleAudio | Performs a change of the audio sample rate.
SSRC | Performs a high-quality change of the audio sample rate. It uses SSRC by Naoki Shibata, which offers the best resample quality available.
SuperEQ | High quality 16 band sound equalizer.
TimeStretch | This filter can change speed of the sound without changing the pitch, and change the pitch of a sound without changing the length of a sound.
Tone | This will generate sound.

## Special and exotic filters

Animate / ApplyRange | Animate (ApplyRange) is a meta-filter which evaluates its parameter filter with continuously varying (the same) arguments.
ConditionalFilter / FrameEvaluate / ScriptClip / ConditionalReader | ConditionalFilter returns source1 if some condition is met, otherwise it returns source2. ScriptClip returns the clip which is returned by the function evaluated on every frame.
FixBrokenChromaUpsampling | I noticed that the MS DV codec upsamples the chroma channels incorrectly, and I added a FixBrokenChromaUpsampling filter to compensate for it.
FixLuminance | Correct shifting vertical luma offset
FlipHorizontal / FlipVertical | Flips the video upside-down or left-to-right
Imagewriter | Writes frames as images to your hard disk.
PeculiarBlend | This filter blends each frame with the following frame in a peculiar way.
Reverse | This filter makes a clip play in reverse.
Subtitle | The Subtitle filter adds a single line of anti-aliased text to a range of frames.
TCPDeliver | This filter will enable you to send clips over your network. You can connect several clients to the same machine.
TurnLeft / TurnRight / Turn180 | Rotates the clip 90 degrees counterclock wise / 90 degrees clock wise / 180 degrees.
WriteFile / WriteFileIf / WriteFileStart / WriteFileEnd | Output to a textfile.

## Debug filters

ColorBars | The ColorBars filter produces a video clip containing SMPTE color bars scaled to any image size.
Compare | Compares two clips and prints out information about the differences.
Histogram | Adds a Histogram.
Info | Prints out image and sound information.
MessageClip | MessageClip produces a clip containing a text message
ShowFiveVersions | ShowFiveVersions takes five video streams and combines them in a staggered arrangement from left to right.
ShowFrameNumber / ShowSMPTE | ShowFrameNumber draws text on every frame indicating what number Avisynth thinks it is.
StackHorizontal / StackVertical | StackHorizontal takes two or more video clips and displays them together in left-to-right order.
Subtract | Subtract produces an output clip in which every pixel is set according to the difference between the corresponding pixels
Version | The Version filter generates a video clip with a short version and copyright statement

`$Date: 2005/10/03 16:49:04 $`