Audio/video filters

The particular set of Audio/video filters that you can use can depend on the version of the underlying encoding tools that Transloadit uses for the following Robots:

Transloadit recommends having: ffmpeg_stack: "v6.0.0" in these Robots' Assembly Instructions. We are intimately aware of how important continuity is for our customers, so stack version upgrades are always opt-in. Stack versions are typically supported for many years before we start issuing deprecation warnings (for example: we had been supporting "v1.0.0" for 11 years before we deprecated it).

Name	Description	`ffmpeg_stack`
		Name	Description
		Name	Description	`"v5.0.0"`	`"v6.0.0"`
read	write	read	write
`a3dscope`	Convert input audio to 3d scope video output.
`abench`	Benchmark part of a filtergraph.
`abitscope`	Convert input audio to audio bit scope video output.
`abuffer`	Buffer audio frames, and make them accessible to the filterchain.
`abuffersink`	Buffer audio frames, and make them available to the end of the filter graph.
`acompressor`	Audio compressor.
`acontrast`	Simple audio dynamic range compression/expansion filter.
`acopy`	Copy the input audio unchanged to the output.
`acrossfade`	Cross fade two input audio streams.
`acrossover`	Split audio into per-bands streams.
`acrusher`	Reduce audio bit resolution.
`acue`	Delay filtering to match a cue.
`addroi`	Add region of interest to frame.
`adeclick`	Remove impulsive noise from input audio.
`adeclip`	Remove clipping from input audio.
`adecorrelate`	Apply decorrelation to input audio.
`adelay`	Delay one or more audio channels.
`adenorm`	Remedy denormals by adding extremely low-level noise.
`aderivative`	Compute derivative of input audio.
`adrawgraph`	Draw a graph using input audio metadata.
`adrc`	Audio Spectral Dynamic Range Controller.
`adynamicequalizer`	Apply Dynamic Equalization of input audio.
`adynamicsmooth`	Apply Dynamic Smoothing of input audio.
`aecho`	Add echoing to the audio.
`aemphasis`	Audio emphasis.
`aeval`	Filter audio signal according to a specified expression.
`aevalsrc`	Generate an audio signal generated by an expression.
`aexciter`	Enhance high frequency part of audio.
`afade`	Fade in/out input audio.
`afdelaysrc`	Generate a Fractional delay FIR coefficients.
`afftdn`	Denoise audio samples using FFT.
`afftfilt`	Apply arbitrary expressions to samples in frequency domain.
`afifo`	Buffer input frames and send them when they are requested.
`afir`	Apply Finite Impulse Response filter with supplied coefficients in additional stream(s).
`afireqsrc`	Generate a FIR equalizer coefficients audio stream.
`afirsrc`	Generate a FIR coefficients audio stream.
`aformat`	Convert the input audio to one of the specified formats.
`afreqshift`	Apply frequency shifting to input audio.
`afwtdn`	Denoise audio stream using Wavelets.
`agate`	Audio gate.
`agraphmonitor`	Show various filtergraph stats.
`ahistogram`	Convert input audio to histogram video output.
`aiir`	Apply Infinite Impulse Response filter with supplied coefficients.
`aintegral`	Compute integral of input audio.
`ainterleave`	Temporally interleave audio inputs.
`alatency`	Report audio filtering latency.
`alimiter`	Audio lookahead limiter.
`allpass`	Apply a two-pole all-pass filter.
`allrgb`	Generate all RGB colors.
`allyuv`	Generate all yuv colors.
`aloop`	Loop audio samples.
`alphaextract`	Extract an alpha channel as a grayscale image component.
`alphamerge`	Copy the luma value of the second input into the alpha channel of the first input.
`amerge`	Merge two or more audio streams into a single multi-channel stream.
`ametadata`	Manipulate audio frame metadata.
`amix`	Audio mixing.
`amovie`	Read audio from a movie source.
`amplify`	Amplify changes between successive video frames.
`amultiply`	Multiply two audio streams.
`anequalizer`	Apply high-order audio parametric multi band equalizer.
`anlmdn`	Reduce broadband noise from stream using Non-Local Means.
`anlmf`	Apply Normalized Least-Mean-Fourth algorithm to first audio stream.
`anlms`	Apply Normalized Least-Mean-Squares algorithm to first audio stream.
`anoisesrc`	Generate a noise audio signal.
`anull`	Pass the source unchanged to the output.
`anullsink`	Do absolutely nothing with the input audio.
`anullsrc`	Null audio source, return empty audio frames.
`apad`	Pad audio with silence.
`aperms`	Set permissions for the output audio frame.
`aphasemeter`	Convert input audio to phase meter video output.
`aphaser`	Add a phasing effect to the audio.
`aphaseshift`	Apply phase shifting to input audio.
`apsnr`	Measure Audio Peak Signal-to-Noise Ratio.
`apsyclip`	Audio Psychoacoustic Clipper.
`apulsator`	Audio pulsator.
`arealtime`	Slow down filtering to match realtime.
`aresample`	Resample audio data.
`areverse`	Reverse an audio clip.
`arls`	Apply Recursive Least Squares algorithm to first audio stream.
`arnndn`	Reduce noise from speech using Recurrent Neural Networks.
`asdr`	Measure Audio Signal-to-Distortion Ratio.
`asegment`	Segment audio stream.
`aselect`	Select audio frames to pass in output.
`asendcmd`	Send commands to filters.
`asetnsamples`	Set the number of samples for each output audio frames.
`asetpts`	Set PTS for the output audio frame.
`asetrate`	Change the sample rate without altering the data.
`asettb`	Set timebase for the audio output link.
`ashowinfo`	Show textual information for each audio frame.
`asidedata`	Manipulate audio frame side data.
`asisdr`	Measure Audio Scale-Invariant Signal-to-Distortion Ratio.
`asoftclip`	Audio Soft Clipper.
`aspectralstats`	Show frequency domain statistics about audio frames.
`asplit`	Pass on the audio input to N audio outputs.
`ass`	Render ASS subtitles onto input video using the libass library.
`astats`	Show time domain statistics about audio frames.
`astreamselect`	Select audio streams
`asubboost`	Boost subwoofer frequencies.
`asubcut`	Cut subwoofer frequencies.
`asupercut`	Cut super frequencies.
`asuperpass`	Apply high order Butterworth band-pass filter.
`asuperstop`	Apply high order Butterworth band-stop filter.
`atadenoise`	Apply an Adaptive Temporal Averaging Denoiser.
`atempo`	Adjust audio tempo.
`atilt`	Apply spectral tilt to audio.
`atrim`	Pick one continuous section from the input, drop the rest.
`avectorscope`	Convert input audio to vectorscope video output.
`avgblur`	Apply Average Blur filter.
`avgblur_opencl`	Apply average blur filter
`avgblur_vulkan`	Apply avgblur mask to input video
`avsynctest`	Generate an Audio Video Sync Test.
`axcorrelate`	Cross-correlate two audio streams.
`azmq`	Receive commands through ZMQ and broker them to filters.
`backgroundkey`	Turns a static background into transparency.
`bandpass`	Apply a two-pole Butterworth band-pass filter.
`bandreject`	Apply a two-pole Butterworth band-reject filter.
`bass`	Boost or cut lower frequencies.
`bbox`	Compute bounding box for each frame.
`bench`	Benchmark part of a filtergraph.
`bilateral`	Apply Bilateral filter.
`bilateral_cuda`	GPU accelerated bilateral filter
`biquad`	Apply a biquad IIR filter with the given coefficients.
`bitplanenoise`	Measure bit plane noise.
`blackdetect`	Detect video intervals that are (almost) black.
`blackframe`	Detect frames that are (almost) black.
`blend`	Blend two video frames into each other.
`blend_vulkan`	Blend two video frames in Vulkan
`blockdetect`	Blockdetect filter.
`blurdetect`	Blurdetect filter.
`bm3d`	Block-Matching 3D denoiser.
`boxblur`	Blur the input.
`boxblur_opencl`	Apply boxblur filter to input video
`bs2b`	Bauer stereo-to-binaural filter.
`buffer`	Buffer video frames, and make them accessible to the filterchain.
`buffersink`	Buffer video frames, and make them available to the end of the filter graph.
`bwdif`	Deinterlace the input image.
`bwdif_cuda`	Deinterlace CUDA frames
`bwdif_vulkan`	Deinterlace Vulkan frames via bwdif
`cas`	Contrast Adaptive Sharpen.
`ccrepack`	Repack CEA-708 closed caption metadata
`cellauto`	Create pattern generated by an elementary cellular automaton.
`channelmap`	Remap audio channels.
`channelsplit`	Split audio into per-channel streams.
`chorus`	Add a chorus effect to the audio.
`chromaber_vulkan`	Offset chroma of input video (chromatic aberration)
`chromahold`	Turns a certain color range into gray.
`chromakey`	Turns a certain color into transparency. Operates on YUV colors.
`chromakey_cuda`	GPU accelerated chromakey filter
`chromanr`	Reduce chrominance noise.
`chromashift`	Shift chroma.
`ciescope`	Video CIE scope.
`codecview`	Visualize information about some codecs.
`color`	Provide an uniformly colored input.
`color_vulkan`	Generate a constant color (Vulkan)
`colorbalance`	Adjust the color balance.
`colorchannelmixer`	Adjust colors by mixing color channels.
`colorchart`	Generate color checker chart.
`colorcontrast`	Adjust color contrast between RGB components.
`colorcorrect`	Adjust color white balance selectively for blacks and whites.
`colorhold`	Turns a certain color range into gray. Operates on RGB colors.
`colorize`	Overlay a solid color on the video stream.
`colorkey`	Turns a certain color into transparency. Operates on RGB colors.
`colorkey_opencl`	Turns a certain color into transparency. Operates on RGB colors.
`colorlevels`	Adjust the color levels.
`colormap`	VVV->V Apply custom Color Maps to video stream.
`colormatrix`	Convert color matrix.
`colorspace`	Convert between colorspaces.
`colorspace_cuda`	CUDA accelerated video color converter
`colorspectrum`	Generate colors spectrum.
`colortemperature`	Adjust color temperature of video.
`compand`	Compress or expand audio dynamic range.
`compensationdelay`	Audio Compensation Delay Line.
`concat`	Concatenate audio and video streams.
`convolution`	Apply convolution filter.
`convolution_opencl`	Apply convolution mask to input video
`convolve`	Convolve first video stream with second video stream.
`copy`	Copy the input video unchanged to the output.
`corr`	Calculate the correlation between two video streams.
`cover_rect`	Find and cover a user specified object.
`crop`	Crop the input video.
`cropdetect`	Auto-detect crop size.
`crossfeed`	Apply headphone crossfeed filter.
`crystalizer`	Simple audio noise sharpening filter.
`cue`	Delay filtering to match a cue.
`curves`	Adjust components curves.
`datascope`	Video data analysis.
`dblur`	Apply Directional Blur filter.
`dcshift`	Apply a DC shift to the audio.
`dctdnoiz`	Denoise frames using 2D DCT.
`deband`	Debands video.
`deblock`	Deblock video.
`decimate`	Decimate frames (post field matching filter).
`deconvolve`	Deconvolve first video stream with second video stream.
`dedot`	Reduce cross-luminance and cross-color.
`deesser`	Apply de-essing to the audio.
`deflate`	Apply deflate effect.
`deflicker`	Remove temporal frame luminance variations.
`deinterlace_vaapi`	Deinterlacing of VAAPI surfaces
`dejudder`	Remove judder produced by pullup.
`delogo`	Remove logo from input video.
`denoise_vaapi`	VAAPI VPP for de-noise
`derain`	Apply derain filter to the input.
`deshake`	Stabilize shaky video.
`deshake_opencl`	Feature-point based video stabilization filter
`despill`	Despill video.
`detelecine`	Apply an inverse telecine pattern.
`dialoguenhance`	Audio Dialogue Enhancement.
`dilation`	Apply dilation effect.
`dilation_opencl`	Apply dilation effect
`displace`	VVV->V Displace pixels.
`dnn_classify`	Apply DNN classify filter to the input.
`dnn_detect`	Apply DNN detect filter to the input.
`dnn_processing`	Apply DNN processing filter to the input.
`doubleweave`	Weave input video fields into double number of frames.
`drawbox`	Draw a colored box on the input video.
`drawgraph`	Draw a graph using input video metadata.
`drawgrid`	Draw a colored grid on the input video.
`drawtext`	Draw text on top of video frames using libfreetype library.
`drmeter`	Measure audio dynamic range.
`dynaudnorm`	Dynamic Audio Normalizer.
`earwax`	Widen the stereo image.
`ebur128`	EBU R128 scanner.
`edgedetect`	Detect and draw edge.
`elbg`	Apply posterize effect, using the ELBG algorithm.
`entropy`	Measure video frames entropy.
`epx`	Scale the input using EPX algorithm.
`eq`	Adjust brightness, contrast, gamma, and saturation.
`equalizer`	Apply two-pole peaking equalization (EQ) filter.
`erosion`	Apply erosion effect.
`erosion_opencl`	Apply erosion effect
`estdif`	Apply Edge Slope Tracing deinterlace.
`exposure`	Adjust exposure of the video stream.
`extractplanes`	Extract planes as grayscale frames.
`extrastereo`	Increase difference between stereo audio channels.
`fade`	Fade in/out input video.
`feedback`	Apply feedback video filter.
`fftdnoiz`	Denoise frames using 3D FFT.
`fftfilt`	Apply arbitrary expressions to pixels in frequency domain.
`field`	Extract a field from the input video.
`fieldhint`	Field matching using hints.
`fieldmatch`	Field matching for inverse telecine.
`fieldorder`	Set the field order.
`fifo`	Buffer input images and send them when they are requested.
`fillborders`	Fill borders of the input video.
`find_rect`	Find a user specified object.
`firequalizer`	Finite Impulse Response Equalizer.
`flanger`	Apply a flanging effect to the audio.
`flip_vulkan`	Flip both horizontally and vertically
`flite`	Synthesize voice from text using libflite.
`floodfill`	Fill area with same color with another color.
`format`	Convert the input video to one of the specified pixel formats.
`fps`	Force constant framerate.
`framepack`	Generate a frame packed stereoscopic video.
`framerate`	Upsamples or downsamples progressive source between specified frame rates.
`framestep`	Select one frame every N frames.
`freezedetect`	Detects frozen video input.
`freezeframes`	Freeze video frames.
`frei0r`	Apply a frei0r effect.
`frei0r_src`	Generate a frei0r source.
`fspp`	Apply Fast Simple Post-processing filter.
`gblur`	Apply Gaussian Blur filter.
`gblur_vulkan`	Gaussian Blur in Vulkan
`geq`	Apply generic equation to each pixel.
`gradfun`	Debands video quickly using gradients.
`gradients`	Draw a gradients.
`graphmonitor`	Show various filtergraph stats.
`grayworld`	Adjust white balance using LAB gray world algorithm
`greyedge`	Estimates scene illumination by grey edge assumption.
`guided`	Apply Guided filter.
`haas`	Apply Haas Stereo Enhancer.
`haldclut`	Adjust colors using a Hald CLUT.
`haldclutsrc`	Provide an identity Hald CLUT.
`hdcd`	Apply High Definition Compatible Digital (HDCD) decoding.
`headphone`	Apply headphone binaural spatialization with HRTFs in additional streams.
`hflip`	Horizontally flip the input video.
`hflip_vulkan`	Horizontally flip the input video in Vulkan
`highpass`	Apply a high-pass filter with 3dB point frequency.
`highshelf`	Apply a high shelf filter.
`hilbert`	Generate a Hilbert transform FIR coefficients.
`histeq`	Apply global color histogram equalization.
`histogram`	Compute and draw a histogram.
`hqdn3d`	Apply a High Quality 3D Denoiser.
`hqx`	Scale the input by 2, 3 or 4 using the hq*x magnification algorithm.
`hstack`	Stack video inputs horizontally.
`hstack_vaapi`	"VA-API" hstack
`hsvhold`	Turns a certain HSV range into gray.
`hsvkey`	Turns a certain HSV range into transparency. Operates on YUV colors.
`hue`	Adjust the hue and saturation of the input video.
`huesaturation`	Apply hue-saturation-intensity adjustments.
`hwdownload`	Download a hardware frame to a normal frame
`hwmap`	Map hardware frames
`hwupload`	Upload a normal frame to a hardware frame
`hwupload_cuda`	Upload a system memory frame to a CUDA device.
`hysteresis`	Grow first stream into second stream by connecting components.
`identity`	Calculate the Identity between two video streams.
`idet`	Interlace detect Filter.
`il`	Deinterleave or interleave fields.
`inflate`	Apply inflate effect.
`interlace`	Convert progressive video into interlaced.
`interleave`	Temporally interleave video inputs.
`join`	Join multiple audio streams into multi-channel output.
`kerndeint`	Apply kernel deinterlacing to the input.
`kirsch`	Apply kirsch operator.
`ladspa`	Apply LADSPA effect.
`lagfun`	Slowly update darker pixels.
`latency`	Report video filtering latency.
`lenscorrection`	Rectify the image by correcting for lens distortion.
`libplacebo`	Apply various GPU filters from libplacebo
`life`	Create life.
`limitdiff`	Apply filtering with limiting difference.
`limiter`	Limit pixels components to the specified range.
`loop`	Loop video frames.
`loudnorm`	EBU R128 loudness normalization
`lowpass`	Apply a low-pass filter with 3dB point frequency.
`lowshelf`	Apply a low shelf filter.
`lumakey`	Turns a certain luma into transparency.
`lut`	Compute and apply a lookup table to the RGB/YUV input video.
`lut1d`	Adjust colors using a 1D LUT.
`lut2`	Compute and apply a lookup table from two video inputs.
`lut3d`	Adjust colors using a 3D LUT.
`lutrgb`	Compute and apply a lookup table to the RGB input video.
`lutyuv`	Compute and apply a lookup table to the YUV input video.
`mandelbrot`	Render a Mandelbrot fractal.
`maskedclamp`	VVV->V Clamp first stream with second stream and third stream.
`maskedmax`	VVV->V Apply filtering with maximum difference of two streams.
`maskedmerge`	VVV->V Merge first stream with second stream using third stream as mask.
`maskedmin`	VVV->V Apply filtering with minimum difference of two streams.
`maskedthreshold`	Pick pixels comparing absolute difference of two streams with threshold.
`maskfun`	Create Mask.
`mcdeint`	Apply motion compensating deinterlacing.
`mcompand`	Multiband Compress or expand audio dynamic range.
`median`	Apply Median filter.
`mergeplanes`	Merge planes.
`mestimate`	Generate motion vectors.
`metadata`	Manipulate video frame metadata.
`midequalizer`	Apply Midway Equalization.
`minterpolate`	Frame rate conversion using Motion Interpolation.
`mix`	Mix video inputs.
`monochrome`	Convert video to gray using custom color filter.
`morpho`	Apply Morphological filter.
`movie`	Read from a movie source.
`mpdecimate`	Remove near-duplicate frames.
`mptestsrc`	Generate various test pattern.
`msad`	Calculate the MSAD between two video streams.
`multiply`	Multiply first video stream with second video stream.
`negate`	Negate input video.
`nlmeans`	Non-local means denoiser.
`nlmeans_opencl`	Non-local means denoiser through OpenCL
`nlmeans_vulkan`	Non-local means denoiser (Vulkan)
`nnedi`	Apply neural network edge directed interpolation intra-only deinterlacer.
`noformat`	Force libavfilter not to use any of the specified pixel formats for the input to the next filter.
`noise`	Add noise.
`normalize`	Normalize RGB video.
`null`	Pass the source unchanged to the output.
`nullsink`	Do absolutely nothing with the input video.
`nullsrc`	Null video source, return unprocessed video frames.
`openclsrc`	Generate video using an OpenCL program
`oscilloscope`	2D Video Oscilloscope.
`overlay`	Overlay a video source on top of the input.
`overlay_cuda`	Overlay one video on top of another using CUDA
`overlay_opencl`	Overlay one video on top of another
`overlay_vaapi`	Overlay one video on top of another
`overlay_vulkan`	Overlay a source on top of another
`owdenoise`	Denoise using wavelets.
`pad`	Pad the input video.
`pad_opencl`	Pad the input video.
`pal100bars`	Generate PAL 100% color bars.
`pal75bars`	Generate PAL 75% color bars.
`palettegen`	Find the optimal palette for a given stream.
`paletteuse`	Use a palette to downsample an input video stream.
`pan`	Remix channels with coefficients (panning).
`perms`	Set permissions for the output video frame.
`perspective`	Correct the perspective of video.
`phase`	Phase shift fields.
`photosensitivity`	Filter out photosensitive epilepsy seizure-inducing flashes.
`pixdesctest`	Test pixel format definitions.
`pixelize`	Pixelize video.
`pixscope`	Pixel data analysis.
`pp`	Filter video using libpostproc.
`pp7`	Apply Postprocessing 7 filter.
`premultiply`	PreMultiply first stream with first plane of second stream.
`prewitt`	Apply prewitt operator.
`prewitt_opencl`	Apply prewitt operator
`procamp_vaapi`	ProcAmp (color balance) adjustments for hue, saturation, brightness, contrast
`program_opencl`	Filter video using an OpenCL program
`pseudocolor`	Make pseudocolored video frames.
`psnr`	Calculate the PSNR between two video streams.
`pullup`	Pullup from field sequence to frames.
`qp`	Change video quantization parameters.
`random`	Return random frames.
`readeia608`	Read EIA-608 Closed Caption codes from input video and write them to frame metadata.
`readvitc`	Read vertical interval timecode and write it to frame metadata.
`realtime`	Slow down filtering to match realtime.
`remap`	VVV->V Remap pixels.
`remap_opencl`	VVV->V Remap pixels using OpenCL.
`removegrain`	Remove grain.
`removelogo`	Remove a TV logo based on a mask image.
`repeatfields`	Hard repeat fields based on MPEG repeat field flag.
`replaygain`	ReplayGain scanner.
`reverse`	Reverse a clip.
`rgbashift`	Shift RGBA.
`rgbtestsrc`	Generate RGB test pattern.
`roberts`	Apply roberts cross operator.
`roberts_opencl`	Apply roberts operator
`rotate`	Rotate the input image.
`sab`	Apply shape adaptive blur.
`scale`	Scale the input video size and/or convert the image format.
`scale2ref`	Scale the input video size and/or convert the image format to the given reference.
`scale_cuda`	GPU accelerated video resizer
`scale_vaapi`	Scale to/from VAAPI surfaces.
`scale_vulkan`	Scale Vulkan frames
`scdet`	Detect video scene change
`scharr`	Apply scharr operator.
`scroll`	Scroll input video.
`segment`	Segment video stream.
`select`	Select video frames to pass in output.
`selectivecolor`	Apply CMYK adjustments to specific color ranges.
`sendcmd`	Send commands to filters.
`separatefields`	Split input video frames into fields.
`setdar`	Set the frame display aspect ratio.
`setfield`	Force field for the output video frame.
`setparams`	Force field, or color property for the output video frame.
`setpts`	Set PTS for the output video frame.
`setrange`	Force color range for the output video frame.
`setsar`	Set the pixel sample aspect ratio.
`settb`	Set timebase for the video output link.
`sharpness_vaapi`	VAAPI VPP for sharpness
`shear`	Shear transform the input image.
`showcqt`	Convert input audio to a CQT (Constant/Clamped Q Transform) spectrum video output.
`showcwt`	Convert input audio to a CWT (Continuous Wavelet Transform) spectrum video output.
`showfreqs`	Convert input audio to a frequencies video output.
`showinfo`	Show textual information for each video frame.
`showpalette`	Display frame palette.
`showspatial`	Convert input audio to a spatial video output.
`showspectrum`	Convert input audio to a spectrum video output.
`showspectrumpic`	Convert input audio to a spectrum video output single picture.
`showvolume`	Convert input audio volume to video output.
`showwaves`	Convert input audio to a video output.
`showwavespic`	Convert input audio to a video output single picture.
`shuffleframes`	Shuffle video frames.
`shufflepixels`	Shuffle video pixels.
`shuffleplanes`	Shuffle video planes.
`sidechaincompress`	Sidechain compressor.
`sidechaingate`	Audio sidechain gate.
`sidedata`	Manipulate video frame side data.
`sierpinski`	Render a Sierpinski fractal.
`signalstats`	Generate statistics from video analysis.
`signature`	Calculate the MPEG-7 video signature
`silencedetect`	Detect silence.
`silenceremove`	Remove silence.
`sinc`	Generate a sinc kaiser-windowed low-pass, high-pass, band-pass, or band-reject FIR coefficients.
`sine`	Generate sine wave audio signal.
`siti`	Calculate spatial information (SI) and temporal information (TI).
`smartblur`	Blur the input video without impacting the outlines.
`smptebars`	Generate SMPTE color bars.
`smptehdbars`	Generate SMPTE HD color bars.
`sobel`	Apply sobel operator.
`sobel_opencl`	Apply sobel operator
`sofalizer`	SOFAlizer (Spatially Oriented Format for Acoustics).
`spectrumsynth`	Convert input spectrum videos to audio output.
`speechnorm`	Speech Normalizer.
`split`	Pass on the input to N video outputs.
`spp`	Apply a simple post processing filter.
`sr`	Apply DNN-based image super resolution to the input.
`ssim`	Calculate the SSIM between two video streams.
`ssim360`	Calculate the SSIM between two 360 video streams.
`stereo3d`	Convert video stereoscopic 3D view.
`stereotools`	Apply various stereo tools.
`stereowiden`	Apply stereo widening effect.
`streamselect`	Select video streams
`subtitles`	Render text subtitles onto input video using the libass library.
`super2xsai`	Scale the input by 2x using the Super2xSaI pixel art algorithm.
`superequalizer`	Apply 18 band equalization filter.
`surround`	Apply audio surround upmix filter.
`swaprect`	Swap 2 rectangular objects in video.
`swapuv`	Swap U and V components.
`tblend`	Blend successive frames.
`telecine`	Apply a telecine pattern.
`testsrc`	Generate test pattern.
`testsrc2`	Generate another test pattern.
`thistogram`	Compute and draw a temporal histogram.
`threshold`	VVVV->V Threshold first video stream using other video streams.
`thumbnail`	Select the most representative frame in a given sequence of consecutive frames.
`thumbnail_cuda`	Select the most representative frame in a given sequence of consecutive frames.
`tile`	Tile several successive frames together.
`tiltshelf`	Apply a tilt shelf filter.
`tinterlace`	Perform temporal field interlacing.
`tlut2`	Compute and apply a lookup table from two successive frames.
`tmedian`	Pick median pixels from successive frames.
`tmidequalizer`	Apply Temporal Midway Equalization.
`tmix`	Mix successive video frames.
`tonemap`	Conversion to/from different dynamic ranges.
`tonemap_opencl`	Perform HDR to SDR conversion with tonemapping.
`tonemap_vaapi`	VAAPI VPP for tone-mapping
`tpad`	Temporarily pad video frames.
`transpose`	Transpose input video.
`transpose_opencl`	Transpose input video
`transpose_vaapi`	VAAPI VPP for transpose
`transpose_vulkan`	Transpose Vulkan Filter
`treble`	Boost or cut upper frequencies.
`tremolo`	Apply tremolo effect.
`trim`	Pick one continuous section from the input, drop the rest.
`unpremultiply`	UnPreMultiply first stream with first plane of second stream.
`unsharp`	Sharpen or blur the input video.
`unsharp_opencl`	Apply unsharp mask to input video
`untile`	Untile a frame into a sequence of frames.
`uspp`	Apply Ultra Simple / Slow Post-processing filter.
`v360`	Convert 360 projection of video.
`vaguedenoiser`	Apply a Wavelet based Denoiser.
`varblur`	Apply Variable Blur filter.
`vectorscope`	Video vectorscope.
`vflip`	Flip the input video vertically.
`vflip_vulkan`	Vertically flip the input video in Vulkan
`vfrdet`	Variable frame rate detect filter.
`vibrance`	Boost or alter saturation.
`vibrato`	Apply vibrato effect.
`vidstabdetect`	Extract relative transformations, pass 1 of 2 for stabilization (see vidstabtransform for pass 2).
`vidstabtransform`	Transform the frames, pass 2 of 2 for stabilization (see vidstabdetect for pass 1).
`vif`	Calculate the VIF between two video streams.
`vignette`	Make or reverse a vignette effect.
`virtualbass`	Audio Virtual Bass.
`vmafmotion`	Calculate the VMAF Motion score.
`volume`	Change input volume.
`volumedetect`	Detect audio volume.
`vstack`	Stack video inputs vertically.
`vstack_vaapi`	"VA-API" vstack
`w3fdif`	Apply Martin Weston three field deinterlace.
`waveform`	Video waveform monitor.
`weave`	Weave input video fields into frames.
`xbr`	Scale the input using xBR algorithm.
`xcorrelate`	Cross-correlate first video stream with second video stream.
`xfade`	Cross fade one video with another video.
`xfade_opencl`	Cross fade one video with another video.
`xfade_vulkan`	Cross fade one video with another video.
`xmedian`	Pick median pixels from several video inputs.
`xstack`	Stack video inputs into custom layout.
`xstack_vaapi`	"VA-API" xstack
`yadif`	Deinterlace the input image.
`yadif_cuda`	Deinterlace CUDA frames
`yaepblur`	Yet another edge preserving blur filter.
`yuvtestsrc`	Generate YUV test pattern.
`zmq`	Receive commands through ZMQ and broker them to filters.
`zoneplate`	Generate zone-plate.
`zoompan`	Apply Zoom & Pan effect.
`zscale`	Apply resizing, colorspace and bit depth conversion.