Filters - FFmpeg 1.2.12

Audio

aconvert: Convert the input audio format to the specified formats.
allpass: Apply a two-pole all-pass filter with central frequency (in Hz) frequency, and filter-width width.
highpass: Apply a high-pass filter with 3dB point frequency.
lowpass: Apply a low-pass filter with 3dB point frequency.
bass: Boost or cut the bass (lower) frequencies of the audio using a two-pole shelving filter with a response similar to that of a standard hi-fi’s tone-controls.
treble: Boost or cut treble (upper) frequencies of the audio using a two-pole shelving filter with a response similar to that of a standard hi-fi’s tone-controls.
bandpass: Apply a two-pole Butterworth band-pass filter with central frequency frequency, and (3dB-point) band-width width.
bandreject: Apply a two-pole Butterworth band-reject filter with central frequency frequency, and (3dB-point) band-width width.
biquad: Apply a biquad IIR filter with the given coefficients.
equalizer: Apply a two-pole peaking equalisation (EQ) filter.
afade: Apply fade-in/out effect to input audio.
aformat: Set output format constraints for the input audio.
amerge: Merge two or more audio streams into a single multi-channel stream.
amix: Mixes multiple audio inputs into a single output.
anull: Pass the audio source unchanged to the output.
apad: Pad the end of a audio stream with silence, this can be used together with -shortest to extend audio streams to the same length as the video stream.
aresample: Resample the input audio to the specified parameters, using the libswresample library.
asetnsamples: Set the number of samples per each output audio frame.
ashowinfo: Show a line containing various information for each input audio frame.
asplit: Split input audio into several identical outputs.
astreamsync: Forward two audio streams and control the order the buffers are forwarded.
atempo: Adjust audio tempo.
earwax: Make audio easier to listen to on headphones.
pan: Mix channels with specific gain levels.
silencedetect: Detect silence in an audio stream.
asyncts: Synchronize audio data with timestamps by squeezing/stretching it and/or dropping samples/adding silence when needed.
channelsplit: Split each channel in input audio stream into a separate output stream.
channelmap: Remap input channels to new locations.
join: Join multiple input streams into one multi-channel stream.
resample: Convert the audio sample format, sample rate and channel layout.
volume: Adjust the input audio volume.
volumedetect: Detect the volume of the input video.

Video

alphaextract: Extract the alpha component from the input as a grayscale video.
alphamerge: Add or replace the alpha component of the primary input with the grayscale value of a second input.
ass: Same as the subtitles filter, except that it doesn’t require libavcodec and libavformat to work.
bbox: Compute the bounding box for the non-black pixels in the input frame luminance plane.
blackdetect: Detect video intervals that are (almost) completely black.
blackframe: Detect frames that are (almost) completely black.
blend: Blend two video frames into each other.
boxblur: Apply boxblur algorithm to the input video.
colormatrix: The colormatrix filter allows conversion between any of the following color space: BT.
copy: Copy the input source unchanged to the output.
crop: Crop the input video.
cropdetect: Auto-detect crop size.
decimate: Drop frames that do not differ greatly from the previous frame in order to reduce framerate.
delogo: Suppress a TV station logo by a simple interpolation of the surrounding pixels.
deshake: Attempt to fix small changes in horizontal and/or vertical shift.
drawbox: Draw a colored box on the input image.
drawtext: Draw text string or text from specified file on top of video using the libfreetype library.
edgedetect: Detect and draw edges.
fade: Apply fade-in/out effect to input video.
field: Extract a single field from an interlaced image using stride arithmetic to avoid wasting CPU time.
fieldorder: Transform the field order of the input video.
fifo: Buffer input images and send them when they are requested.
format: Convert the input video to one of the specified pixel formats.
fps: Convert the video to specified constant framerate by duplicating or dropping frames as necessary.
framestep: Select one frame every N.
frei0r: Apply a frei0r effect to the input video.
geq: The filter takes one, two, three or four equations as parameter, separated by ’:’.
gradfun: Fix the banding artifacts that are sometimes introduced into nearly flat regions by truncation to 8bit color depth.
hflip: Flip the input video horizontally.
histeq: This filter applies a global color histogram equalization on a per-frame basis.
histogram: Compute and draw a color distribution histogram for the input video.
hqdn3d: High precision/quality 3d denoise filter.
hue: Modify the hue and/or the saturation of the input.
idet: Detect video interlacing type.
il: Deinterleave or interleave fields.
kerndeint: Deinterlace input video by applying Donald Graft’s adaptive kernel deinterling.
lut: Compute a look-up table for binding each pixel component input value to an output value, and apply it to input video.
lutrgb: Compute a look-up table for binding each pixel component input value to an output value, and apply it to input video.
lutyuv: Compute a look-up table for binding each pixel component input value to an output value, and apply it to input video.
mp: Apply an MPlayer filter to the input video.
negate: Negate input video.
noformat: Force libavfilter not to use any of the specified pixel formats for the input to the next filter.
noise: Add noise on video input frame.
null: Pass the video source unchanged to the output.
ocv: Apply video transform using libopencv.
overlay: Overlay one video on top of another.
pad: Add paddings to the input image, and place the original input at the given coordinates x, y.
pixdesctest: Pixel format descriptor test filter, mainly useful for internal testing.
pp: Enable the specified chain of postprocessing subfilters using libpostproc.
removelogo: Suppress a TV station logo, using an image file to determine which pixels comprise the logo.
scale: Scale (resize) the input video, using the libswscale library.
setdar: The setdar filter sets the Display Aspect Ratio for the filter output video.
setsar: The setsar filter sets the Sample (aka Pixel) Aspect Ratio for the filter output video.
setfield: Force field for the output video frame.
showinfo: Show a line containing various information for each input video frame.
smartblur: Blur the input video without impacting the outlines.
stereo3d: Convert between different stereoscopic image formats.
subtitles: Draw subtitles on top of input video using the libass library.
split: Split input video into several identical outputs.
super2xsai: Scale the input by 2x and smooth using the Super2xSaI (Scale and Interpolate) pixel art scaling algorithm.
swapuv: Swap U & V plane.
thumbnail: Select the most representative frame in a given sequence of consecutive frames.
tile: Tile several successive frames together.
tinterlace: Perform various types of temporal field interlacing.
transpose: Transpose rows with columns in the input video and optionally flip it.
unsharp: Sharpen or blur the input video.
vflip: Flip the input video vertically.
yadif: Deinterlace the input video ("yadif" means "yet another deinterlacing filter").

Multimedia

aselect: Select frames to pass in output.
select: Select frames to pass in output.
asendcmd: asendcmd must be inserted between two audio filters, sendcmd must be inserted between two video filters, but apart from that they act the same way.
sendcmd: asendcmd must be inserted between two audio filters, sendcmd must be inserted between two video filters, but apart from that they act the same way.
asetpts: asetpts works on audio frames, setpts on video frames.
setpts: asetpts works on audio frames, setpts on video frames.
ebur128: EBU R128 scanner filter.
settb: Set the timebase to use for the output frames timestamps.
asettb: Set the timebase to use for the output frames timestamps.
concat: Concatenate audio and video streams, joining them together one after the other.
showspectrum: Convert input audio to a video output, representing the audio frequency spectrum.
showwaves: Convert input audio to a video output, representing the samples waves.