mpv/DOCS/man/vf.rst

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VIDEO FILTERS
=============
Video filters allow you to modify the video stream and its properties. The
syntax is:
``--vf=<filter1[=parameter1:parameter2:...],filter2,...>``
Setup a chain of video filters. This consists on the filter name, and an
option list of parameters after ``=``. The parameters are separated by
``:`` (not ``,``, as that starts a new filter entry).
Before the filter name, a label can be specified with ``@name:``, where
name is an arbitrary user-given name, which identifies the filter. This
is only needed if you want to toggle the filter at runtime.
A ``!`` before the filter name means the filter is enabled by default. It
will be skipped on filter creation. This is also useful for runtime filter
toggling.
See the ``vf`` command (and ``toggle`` sub-command) for further explanations
and examples.
The general filter entry syntax is:
``["@"<label-name>":"] ["!"] <filter-name> [ "=" <filter-parameter-list> ]``
or for the special "toggle" syntax (see ``vf`` command):
``"@"<label-name>``
and the ``filter-parameter-list``:
``<filter-parameter> | <filter-parameter> "," <filter-parameter-list>``
and ``filter-parameter``:
``( <param-name> "=" <param-value> ) | <param-value>``
``param-value`` can further be quoted in ``[`` / ``]`` in case the value
contains characters like ``,`` or ``=``. This is used in particular with
the ``lavfi`` filter, which uses a very similar syntax as mpv (MPlayer
historically) to specify filters and their parameters.
You can also set defaults for each filter. The defaults are applied before the
normal filter parameters.
``--vf-defaults=<filter1[=parameter1:parameter2:...],filter2,...>``
Set defaults for each filter.
.. note::
To get a full list of available video filters, see ``--vf=help`` and
http://ffmpeg.org/ffmpeg-filters.html .
Also, keep in mind that most actual filters are available via the ``lavfi``
wrapper, which gives you access to most of libavfilter's filters. This
includes all filters that have been ported from MPlayer to libavfilter.
Most builtin filters are deprecated in some ways, unless they're only available
in mpv (such as filters which deal with mpv specifics, or which are
implemented in mpv only).
If a filter is not builtin, the ``lavfi-bridge`` will be automatically
tried. This bridge does not support help output, and does not verify
parameters before the filter is actually used. Although the mpv syntax
is rather similar to libavfilter's, it's not the same. (Which means not
everything accepted by vf_lavfi's ``graph`` option will be accepted by
``--vf``.)
You can also prefix the filter name with ``lavfi-`` to force the wrapper.
This is helpful if the filter name collides with a deprecated mpv builtin
filter. For example ``--vf=lavfi-scale=args`` would use libavfilter's
``scale`` filter over mpv's deprecated builtin one.
Video filters are managed in lists. There are a few commands to manage the
filter list.
``--vf-add=<filter1[,filter2,...]>``
Appends the filters given as arguments to the filter list.
``--vf-pre=<filter1[,filter2,...]>``
Prepends the filters given as arguments to the filter list.
``--vf-del=<index1[,index2,...]>``
Deletes the filters at the given indexes. Index numbers start at 0,
negative numbers address the end of the list (-1 is the last).
``--vf-clr``
Completely empties the filter list.
With filters that support it, you can access parameters by their name.
``--vf=<filter>=help``
Prints the parameter names and parameter value ranges for a particular
filter.
``--vf=<filter=named_parameter1=value1[:named_parameter2=value2:...]>``
Sets a named parameter to the given value. Use on and off or yes and no to
set flag parameters.
Available mpv-only filters are:
``crop[=w:h:x:y]``
Crops the given part of the image and discards the rest. Useful to remove
black bands from widescreen videos.
``<w>,<h>``
Cropped width and height, defaults to original width and height.
``<x>,<y>``
Position of the cropped picture, defaults to center.
``expand[=w:h:x:y:aspect:round]``
Expands (not scales) video resolution to the given value and places the
unscaled original at coordinates x, y.
``<w>,<h>``
Expanded width,height (default: original width,height). Negative
values for w and h are treated as offsets to the original size.
.. admonition:: Example
``expand=0:-50:0:0``
Adds a 50 pixel border to the bottom of the picture.
``<x>,<y>``
position of original image on the expanded image (default: center)
``<aspect>``
Expands to fit an aspect instead of a resolution (default: 0).
.. admonition:: Example
``expand=800::::4/3``
Expands to 800x600, unless the source is higher resolution, in
which case it expands to fill a 4/3 aspect.
``<round>``
Rounds up to make both width and height divisible by <r> (default: 1).
``flip``
Flips the image upside down.
``mirror``
Mirrors the image on the Y axis.
``rotate[=0|90|180|270]``
Rotates the image by a multiple of 90 degrees clock-wise.
``scale[=w:h:param:param2:chr-drop:noup:arnd``
Scales the image with the software scaler (slow) and performs a YUV<->RGB
color space conversion (see also ``--sws``).
All parameters are optional.
``<w>:<h>``
scaled width/height (default: original width/height)
:0: scaled d_width/d_height
:-1: original width/height
:-2: Calculate w/h using the other dimension and the prescaled
aspect ratio.
:-3: Calculate w/h using the other dimension and the original
aspect ratio.
:-(n+8): Like -n above, but rounding the dimension to the closest
multiple of 16.
``<param>[:<param2>]`` (see also ``--sws``)
Set some scaling parameters depending on the type of scaler selected
with ``--sws``::
--sws=2 (bicubic): B (blurring) and C (ringing)
0.00:0.60 default
0.00:0.75 VirtualDub's "precise bicubic"
0.00:0.50 Catmull-Rom spline
0.33:0.33 Mitchell-Netravali spline
1.00:0.00 cubic B-spline
--sws=7 (Gaussian): sharpness (0 (soft) - 100 (sharp))
--sws=9 (Lanczos): filter length (1-10)
``<chr-drop>``
chroma skipping
:0: Use all available input lines for chroma (default).
:1: Use only every 2. input line for chroma.
:2: Use only every 4. input line for chroma.
:3: Use only every 8. input line for chroma.
``<noup>``
Disallow upscaling past the original dimensions.
:0: Allow upscaling (default).
:1: Disallow upscaling if one dimension exceeds its original value.
:2: Disallow upscaling if both dimensions exceed their original values.
``<arnd>``
Accurate rounding for the vertical scaler, which may be faster or
slower than the default rounding.
:no: Disable accurate rounding (default).
:yes: Enable accurate rounding.
``dsize[=w:h:aspect-method:r:aspect]``
Changes the intended display aspect at an arbitrary point in the
filter chain. Aspect can be given as a fraction (4/3) or floating point
number (1.33). Note that this filter does *not* do any scaling itself; it
just affects what later scalers (software or hardware) will do when
auto-scaling to the correct aspect.
``<w>,<h>``
New aspect ratio given by a display width and height. Unlike older mpv
versions or MPlayer, this does not set the display size.
Can also be these special values:
:0: original display width and height
:-1: original video width and height (default)
:-2: Calculate w/h using the other dimension and the original display
aspect ratio.
:-3: Calculate w/h using the other dimension and the original video
aspect ratio.
.. admonition:: Example
``dsize=800:-2``
Specifies a display resolution of 800x600 for a 4/3 aspect
video, or 800x450 for a 16/9 aspect video.
``<aspect-method>``
Modifies width and height according to original aspect ratios.
:-1: Ignore original aspect ratio (default).
:0: Keep display aspect ratio by using ``<w>`` and ``<h>`` as maximum
resolution.
:1: Keep display aspect ratio by using ``<w>`` and ``<h>`` as minimum
resolution.
:2: Keep video aspect ratio by using ``<w>`` and ``<h>`` as maximum
resolution.
:3: Keep video aspect ratio by using ``<w>`` and ``<h>`` as minimum
resolution.
.. admonition:: Example
``dsize=800:600:0``
Specifies a display resolution of at most 800x600, or smaller,
in order to keep aspect.
``<r>``
Rounds up to make both width and height divisible by ``<r>``
(default: 1).
``<aspect>``
Force an aspect ratio.
``format=fmt=<value>:colormatrix=<value>:...``
Restricts the color space for the next filter without doing any conversion.
Use together with the scale filter for a real conversion.
.. note::
For a list of available formats, see ``format=fmt=help``.
``<fmt>``
Format name, e.g. rgb15, bgr24, 420p, etc. (default: don't change).
``<outfmt>``
Format name that should be substituted for the output. If they do not
have the same bytes per pixel and chroma subsampling, it will fail.
``<colormatrix>``
Controls the YUV to RGB color space conversion when playing video. There
are various standards. Normally, BT.601 should be used for SD video, and
BT.709 for HD video. (This is done by default.) Using incorrect color space
results in slightly under or over saturated and shifted colors.
These options are not always supported. Different video outputs provide
varying degrees of support. The ``opengl`` and ``vdpau`` video output
drivers usually offer full support. The ``xv`` output can set the color
space if the system video driver supports it, but not input and output
levels. The ``scale`` video filter can configure color space and input
levels, but only if the output format is RGB (if the video output driver
supports RGB output, you can force this with ``-vf scale,format=rgba``).
If this option is set to ``auto`` (which is the default), the video's
color space flag will be used. If that flag is unset, the color space
will be selected automatically. This is done using a simple heuristic that
attempts to distinguish SD and HD video. If the video is larger than
1279x576 pixels, BT.709 (HD) will be used; otherwise BT.601 (SD) is
selected.
Available color spaces are:
:auto: automatic selection (default)
:bt.601: ITU-R BT.601 (SD)
:bt.709: ITU-R BT.709 (HD)
:bt.2020-ncl: ITU-R BT.2020 non-constant luminance system
:bt.2020-cl: ITU-R BT.2020 constant luminance system
:smpte-240m: SMPTE-240M
``<colorlevels>``
YUV color levels used with YUV to RGB conversion. This option is only
necessary when playing broken files which do not follow standard color
levels or which are flagged wrong. If the video does not specify its
color range, it is assumed to be limited range.
The same limitations as with ``<colormatrix>`` apply.
Available color ranges are:
:auto: automatic selection (normally limited range) (default)
:limited: limited range (16-235 for luma, 16-240 for chroma)
:full: full range (0-255 for both luma and chroma)
``<primaries>``
RGB primaries the source file was encoded with. Normally this should be set
in the file header, but when playing broken or mistagged files this can be
used to override the setting.
This option only affects video output drivers that perform color
management, for example ``opengl`` with the ``target-prim`` or
``icc-profile`` suboptions set.
If this option is set to ``auto`` (which is the default), the video's
primaries flag will be used. If that flag is unset, the color space will
be selected automatically, using the following heuristics: If the
``<colormatrix>`` is set or determined as BT.2020 or BT.709, the
corresponding primaries are used. Otherwise, if the video height is
exactly 576 (PAL), BT.601-625 is used. If it's exactly 480 or 486 (NTSC),
BT.601-525 is used. If the video resolution is anything else, BT.709 is
used.
Available primaries are:
:auto: automatic selection (default)
:bt.601-525: ITU-R BT.601 (SD) 525-line systems (NTSC, SMPTE-C)
:bt.601-625: ITU-R BT.601 (SD) 625-line systems (PAL, SECAM)
:bt.709: ITU-R BT.709 (HD) (same primaries as sRGB)
:bt.2020: ITU-R BT.2020 (UHD)
:apple: Apple RGB
:adobe: Adobe RGB (1998)
:prophoto: ProPhoto RGB (ROMM)
:cie1931: CIE 1931 RGB
:dci-p3: DCI-P3 (Digital Cinema)
:v-gamut: Panasonic V-Gamut primaries
``<gamma>``
Gamma function the source file was encoded with. Normally this should be set
in the file header, but when playing broken or mistagged files this can be
used to override the setting.
This option only affects video output drivers that perform color management.
If this option is set to ``auto`` (which is the default), the gamma will
be set to BT.1886 for YCbCr content, sRGB for RGB content and Linear for
XYZ content.
Available gamma functions are:
:auto: automatic selection (default)
:bt.1886: ITU-R BT.1886 (EOTF corresponding to BT.601/BT.709/BT.2020)
:srgb: IEC 61966-2-4 (sRGB)
:linear: Linear light
:gamma1.8: Pure power curve (gamma 1.8)
:gamma2.2: Pure power curve (gamma 2.2)
:gamma2.8: Pure power curve (gamma 2.8)
:prophoto: ProPhoto RGB (ROMM) curve
:pq: ITU-R BT.2100 PQ (Perceptual quantizer) curve
:hlg: ITU-R BT.2100 HLG (Hybrid Log-gamma) curve
:v-log: Panasonic V-Log transfer curve
:s-log1: Sony S-Log1 transfer curve
:s-log2: Sony S-Log2 transfer curve
``<sig-peak>``
Reference peak illumination for the video file, relative to the
signal's reference white level. This is mostly interesting for HDR, but
it can also be used tone map SDR content to simulate a different
exposure. Normally inferred from tags such as MaxCLL or mastering
metadata.
The default of 0.0 will default to the source's nominal peak luminance.
``<light>``
Light type of the scene. This is mostly correctly inferred based on the
gamma function, but it can be useful to override this when viewing raw
camera footage (e.g. V-Log), which is normally scene-referred instead
of display-referred.
Available light types are:
:auto: Automatic selection (default)
:display: Display-referred light (most content)
:hlg: Scene-referred using the HLG OOTF (e.g. HLG content)
:709-1886: Scene-referred using the BT709+BT1886 interaction
:gamma1.2: Scene-referred using a pure power OOTF (gamma=1.2)
``<stereo-in>``
Set the stereo mode the video is assumed to be encoded in. Takes the
same values as the ``--video-stereo-mode`` option.
``<stereo-out>``
Set the stereo mode the video should be displayed as. Takes the
same values as the ``--video-stereo-mode`` option.
``<rotate>``
Set the rotation the video is assumed to be encoded with in degrees.
The special value ``-1`` uses the input format.
``<dw>``, ``<dh>``
Set the display size. Note that setting the display size such that
the video is scaled in both directions instead of just changing the
aspect ratio is an implementation detail, and might change later.
``<dar>``
Set the display aspect ratio of the video frame. This is a float,
but values such as ``[16:9]`` can be passed too (``[...]`` for quoting
to prevent the option parser from interpreting the ``:`` character).
``<spherical-type>``
Type of the spherical projection:
:auto: As indicated by the file (default)
:none: Normal video
:equirect: Equirectangular
:unknown: Unknown projection
``<spherical-yaw>``, ``<spherical-pitch>``, ``<spherical-roll>``
Reference angle in degree, if spherical video is used.
``noformat[=fmt]``
Restricts the color space for the next filter without doing any conversion.
Unlike the format filter, this will allow any color space except the one
you specify.
.. note:: For a list of available formats, see ``noformat=fmt=help``.
``<fmt>``
Format name, e.g. rgb15, bgr24, 420p, etc. (default: 420p).
``lavfi=graph[:sws-flags[:o=opts]]``
Filter video using FFmpeg's libavfilter.
``<graph>``
The libavfilter graph string. The filter must have a single video input
pad and a single video output pad.
See `<https://ffmpeg.org/ffmpeg-filters.html>`_ for syntax and available
filters.
.. warning::
If you want to use the full filter syntax with this option, you have
to quote the filter graph in order to prevent mpv's syntax and the
filter graph syntax from clashing.
.. admonition:: Examples
``-vf lavfi=[gradfun=20:30,vflip]``
``gradfun`` filter with nonsense parameters, followed by a
``vflip`` filter. (This demonstrates how libavfilter takes a
graph and not just a single filter.) The filter graph string is
quoted with ``[`` and ``]``. This requires no additional quoting
or escaping with some shells (like bash), while others (like
zsh) require additional ``"`` quotes around the option string.
``'--vf=lavfi="gradfun=20:30,vflip"'``
Same as before, but uses quoting that should be safe with all
shells. The outer ``'`` quotes make sure that the shell does not
remove the ``"`` quotes needed by mpv.
``'--vf=lavfi=graph="gradfun=radius=30:strength=20,vflip"'``
Same as before, but uses named parameters for everything.
``<sws-flags>``
If libavfilter inserts filters for pixel format conversion, this
option gives the flags which should be passed to libswscale. This
option is numeric and takes a bit-wise combination of ``SWS_`` flags.
See ``http://git.videolan.org/?p=ffmpeg.git;a=blob;f=libswscale/swscale.h``.
``<o>``
Set AVFilterGraph options. These should be documented by FFmpeg.
.. admonition:: Example
``'--vf=lavfi=yadif:o="threads=2,thread_type=slice"'``
forces a specific threading configuration.
``pullup[=jl:jr:jt:jb:sb:mp]``
Pulldown reversal (inverse telecine) filter, capable of handling mixed
hard-telecine, 24000/1001 fps progressive, and 30000/1001 fps progressive
content. The ``pullup`` filter makes use of future context in making its
decisions. It is stateless in the sense that it does not lock onto a pattern
to follow, but it instead looks forward to the following fields in order to
identify matches and rebuild progressive frames.
``jl``, ``jr``, ``jt``, and ``jb``
These options set the amount of "junk" to ignore at the left, right,
top, and bottom of the image, respectively. Left/right are in units of
8 pixels, while top/bottom are in units of 2 lines. The default is 8
pixels on each side.
``sb`` (strict breaks)
Setting this option to 1 will reduce the chances of ``pullup``
generating an occasional mismatched frame, but it may also cause an
excessive number of frames to be dropped during high motion sequences.
Conversely, setting it to -1 will make ``pullup`` match fields more
easily. This may help process video with slight blurring between the
fields, but may also cause interlaced frames in the output.
``mp`` (metric plane)
This option may be set to ``u`` or ``v`` to use a chroma plane instead of the
luma plane for doing ``pullup``'s computations. This may improve accuracy
on very clean source material, but more likely will decrease accuracy,
especially if there is chroma noise (rainbow effect) or any grayscale
video. The main purpose of setting ``mp`` to a chroma plane is to reduce
CPU load and make pullup usable in realtime on slow machines.
``yadif=[mode:interlaced-only]``
Yet another deinterlacing filter
``<mode>``
:frame: Output 1 frame for each frame.
:field: Output 1 frame for each field (default).
:frame-nospatial: Like ``frame`` but skips spatial interlacing check.
:field-nospatial: Like ``field`` but skips spatial interlacing check.
``<interlaced-only>``
:no: Deinterlace all frames.
:yes: Only deinterlace frames marked as interlaced (default).
This filter is automatically inserted when using the ``d`` key (or any
other key that toggles the ``deinterlace`` property or when using the
``--deinterlace`` switch), assuming the video output does not have native
deinterlacing support.
If you just want to set the default mode, put this filter and its options
into ``--vf-defaults`` instead, and enable deinterlacing with ``d`` or
``--deinterlace``.
Also, note that the ``d`` key is stupid enough to insert a deinterlacer twice
when inserting yadif with ``--vf``, so using the above methods is
recommended.
``sub=[=bottom-margin:top-margin]``
Moves subtitle rendering to an arbitrary point in the filter chain, or force
subtitle rendering in the video filter as opposed to using video output OSD
support.
``<bottom-margin>``
Adds a black band at the bottom of the frame. The SSA/ASS renderer can
place subtitles there (with ``--sub-use-margins``).
``<top-margin>``
Black band on the top for toptitles (with ``--sub-use-margins``).
.. admonition:: Examples
``--vf=sub,eq``
Moves sub rendering before the eq filter. This will put both
subtitle colors and video under the influence of the video equalizer
settings.
``stereo3d[=in:out]``
Stereo3d converts between different stereoscopic image formats.
``<in>``
Stereoscopic image format of input. Possible values:
``sbsl`` or ``side_by_side_left_first``
side by side parallel (left eye left, right eye right)
``sbsr`` or ``side_by_side_right_first``
side by side crosseye (right eye left, left eye right)
``abl`` or ``above_below_left_first``
above-below (left eye above, right eye below)
``abr`` or ``above_below_right_first``
above-below (right eye above, left eye below)
``ab2l`` or ``above_below_half_height_left_first``
above-below with half height resolution (left eye above, right eye
below)
``ab2r`` or ``above_below_half_height_right_first``
above-below with half height resolution (right eye above, left eye
below)
``<out>``
Stereoscopic image format of output. Possible values are all the input
formats as well as:
``arcg`` or ``anaglyph_red_cyan_gray``
anaglyph red/cyan gray (red filter on left eye, cyan filter on
right eye)
``arch`` or ``anaglyph_red_cyan_half_color``
anaglyph red/cyan half colored (red filter on left eye, cyan filter
on right eye)
``arcc`` or ``anaglyph_red_cyan_color``
anaglyph red/cyan color (red filter on left eye, cyan filter on
right eye)
``arcd`` or ``anaglyph_red_cyan_dubois``
anaglyph red/cyan color optimized with the least-squares
projection of Dubois (red filter on left eye, cyan filter on right
eye)
``agmg`` or ``anaglyph_green_magenta_gray``
anaglyph green/magenta gray (green filter on left eye, magenta
filter on right eye)
``agmh`` or ``anaglyph_green_magenta_half_color``
anaglyph green/magenta half colored (green filter on left eye,
magenta filter on right eye)
``agmc`` or ``anaglyph_green_magenta_color``
anaglyph green/magenta colored (green filter on left eye, magenta
filter on right eye)
``aybg`` or ``anaglyph_yellow_blue_gray``
anaglyph yellow/blue gray (yellow filter on left eye, blue filter
on right eye)
``aybh`` or ``anaglyph_yellow_blue_half_color``
anaglyph yellow/blue half colored (yellow filter on left eye, blue
filter on right eye)
``aybc`` or ``anaglyph_yellow_blue_color``
anaglyph yellow/blue colored (yellow filter on left eye, blue
filter on right eye)
``irl`` or ``interleave_rows_left_first``
Interleaved rows (left eye has top row, right eye starts on next
row)
``irr`` or ``interleave_rows_right_first``
Interleaved rows (right eye has top row, left eye starts on next
row)
``ml`` or ``mono_left``
mono output (left eye only)
``mr`` or ``mono_right``
mono output (right eye only)
``gradfun[=strength[:radius|:size=<size>]]``
Fix the banding artifacts that are sometimes introduced into nearly flat
regions by truncation to 8-bit color depth. Interpolates the gradients that
should go where the bands are, and dithers them.
``<strength>``
Maximum amount by which the filter will change any one pixel. Also the
threshold for detecting nearly flat regions (default: 1.5).
``<radius>``
Neighborhood to fit the gradient to. Larger radius makes for smoother
gradients, but also prevents the filter from modifying pixels near
detailed regions (default: disabled).
``<size>``
size of the filter in percent of the image diagonal size. This is
used to calculate the final radius size (default: 1).
``vapoursynth=file:buffered-frames:concurrent-frames``
Loads a VapourSynth filter script. This is intended for streamed
processing: mpv actually provides a source filter, instead of using a
native VapourSynth video source. The mpv source will answer frame
requests only within a small window of frames (the size of this window
is controlled with the ``buffered-frames`` parameter), and requests outside
of that will return errors. As such, you can't use the full power of
VapourSynth, but you can use certain filters.
If you just want to play video generated by a VapourSynth (i.e. using
a native VapourSynth video source), it's better to use ``vspipe`` and a
FIFO to feed the video to mpv. The same applies if the filter script
requires random frame access (see ``buffered-frames`` parameter).
This filter is experimental. If it turns out that it works well and is
used, it will be ported to libavfilter. Otherwise, it will be just removed.
``file``
Filename of the script source. Currently, this is always a python
script. The variable ``video_in`` is set to the mpv video source,
and it is expected that the script reads video from it. (Otherwise,
mpv will decode no video, and the video packet queue will overflow,
eventually leading to audio being stopped.) The script is also
expected to pass through timestamps using the ``_DurationNum`` and
``_DurationDen`` frame properties.
.. admonition:: Example:
::
import vapoursynth as vs
core = vs.get_core()
core.std.AddBorders(video_in, 10, 10, 20, 20).set_output()
.. warning::
The script will be reloaded on every seek. This is done to reset
the filter properly on discontinuities.
``buffered-frames``
Maximum number of decoded video frames that should be buffered before
the filter (default: 4). This specifies the maximum number of frames
the script can request in reverse direction.
E.g. if ``buffered-frames=5``, and the script just requested frame 15,
it can still request frame 10, but frame 9 is not available anymore.
If it requests frame 30, mpv will decode 15 more frames, and keep only
frames 25-30.
The actual number of buffered frames also depends on the value of the
``concurrent-frames`` option. Currently, both option values are
multiplied to get the final buffer size.
(Normally, VapourSynth source filters must provide random access, but
mpv was made for playback, and does not provide frame-exact random
access. The way this video filter works is a compromise to make simple
filters work anyway.)
``concurrent-frames``
Number of frames that should be requested in parallel. The
level of concurrency depends on the filter and how quickly mpv can
decode video to feed the filter. This value should probably be
proportional to the number of cores on your machine. Most time,
making it higher than the number of cores can actually make it
slower.
By default, this uses the special value ``auto``, which sets the option
to the number of detected logical CPU cores.
The following variables are defined by mpv:
``video_in``
The mpv video source as vapoursynth clip. Note that this has no length
set, which confuses many filters. Using ``Trim`` on the clip with a
high dummy length can turn it into a finite clip.
``video_in_dw``, ``video_in_dh``
Display size of the video. Can be different from video size if the
video does not use square pixels (e.g. DVD).
``container_fps``
FPS value as reported by file headers. This value can be wrong or
completely broken (e.g. 0 or NaN). Even if the value is correct,
if another filter changes the real FPS (by dropping or inserting
frames), the value of this variable might not be useful. Note that
the ``--fps`` command line option overrides this value.
Useful for some filters which insist on having a FPS.
``display_fps``
Refresh rate of the current display. Note that this value can be 0.
``vapoursynth-lazy``
The same as ``vapoursynth``, but doesn't load Python scripts. Instead, a
custom backend using Lua and the raw VapourSynth API is used. The syntax
is completely different, and absolutely no convenience features are
provided. There's no type checking either, and you can trigger crashes.
.. admonition:: Example:
::
video_out = invoke("morpho", "Open", {clip = video_in})
The special variable ``video_in`` is the mpv video source, while the
special variable ``video_out`` is used to read video from. The 1st argument
is the plugin (queried with ``getPluginByNs``), the 2nd is the filter name,
and the 3rd argument is a table with the arguments. Positional arguments
are not supported. The types must match exactly. Since Lua is terrible and
can't distinguish integers and floats, integer arguments must be prefixed
with ``i_``, in which case the prefix is removed and the argument is cast
to an integer. Should the argument's name start with ``i_``, you're out of
luck.
Clips (VSNodeRef) are passed as light userdata, so trying to pass any
other userdata type will result in hard crashes.
``vavpp``
VA-AP-API video post processing. Works with ``--vo=vaapi`` and ``--vo=opengl``
only. Currently deinterlaces. This filter is automatically inserted if
deinterlacing is requested (either using the ``d`` key, by default mapped to
the command ``cycle deinterlace``, or the ``--deinterlace`` option).
``deint=<method>``
Select the deinterlacing algorithm.
no
Don't perform deinterlacing.
first-field
Show only first field.
bob
bob deinterlacing (default).
weave, motion-adaptive, motion-compensated
Advanced deinterlacing algorithms. Whether these actually work
depends on the GPU hardware, the GPU drivers, driver bugs, and
mpv bugs.
``<interlaced-only>``
:no: Deinterlace all frames.
:yes: Only deinterlace frames marked as interlaced (default).
``reversal-bug=<yes|no>``
:no: Use the API as it was interpreted by older Mesa drivers. While
this interpretation was more obvious and inuitive, it was
apparently wrong, and not shared by Intel driver developers.
:yes: Use Intel interpretation of surface forward and backwards
references (default). This is what Intel drivers and newer Mesa
drivers expect. Matters only for the advanced deinterlacing
algorithms.
``vdpaupp``
VDPAU video post processing. Works with ``--vo=vdpau`` and ``--vo=opengl``
only. This filter is automatically inserted if deinterlacing is requested
(either using the ``d`` key, by default mapped to the command
``cycle deinterlace``, or the ``--deinterlace`` option). When enabling
deinterlacing, it is always preferred over software deinterlacer filters
if the ``vdpau`` VO is used, and also if ``opengl`` is used and hardware
decoding was activated at least once (i.e. vdpau was loaded).
``sharpen=<-1-1>``
For positive values, apply a sharpening algorithm to the video, for
negative values a blurring algorithm (default: 0).
``denoise=<0-1>``
Apply a noise reduction algorithm to the video (default: 0; no noise
reduction).
``deint=<yes|no>``
Whether deinterlacing is enabled (default: no). If enabled, it will use
the mode selected with ``deint-mode``.
``deint-mode=<first-field|bob|temporal|temporal-spatial>``
Select deinterlacing mode (default: temporal).
Note that there's currently a mechanism that allows the ``vdpau`` VO to
change the ``deint-mode`` of auto-inserted ``vdpaupp`` filters. To avoid
confusion, it's recommended not to use the ``--vo=vdpau`` suboptions
related to filtering.
first-field
Show only first field.
bob
Bob deinterlacing.
temporal
Motion-adaptive temporal deinterlacing. May lead to A/V desync
with slow video hardware and/or high resolution.
temporal-spatial
Motion-adaptive temporal deinterlacing with edge-guided spatial
interpolation. Needs fast video hardware.
``chroma-deint``
Makes temporal deinterlacers operate both on luma and chroma (default).
Use no-chroma-deint to solely use luma and speed up advanced
deinterlacing. Useful with slow video memory.
``pullup``
Try to apply inverse telecine, needs motion adaptive temporal
deinterlacing.
``interlaced-only=<yes|no>``
If ``yes`` (default), only deinterlace frames marked as interlaced.
``hqscaling=<0-9>``
0
Use default VDPAU scaling (default).
1-9
Apply high quality VDPAU scaling (needs capable hardware).
``d3d11vpp``
Direct3D 11 video post processing. Currently requires D3D11 hardware
decoding for use.
``deint=<yes|no>``
Whether deinterlacing is enabled (default: no).
``interlaced-only=<yes|no>``
If ``yes`` (default), only deinterlace frames marked as interlaced.
``mode=<blend|bob|adaptive|mocomp|ivctc|none>``
Tries to select a video processor with the given processing capability.
If a video processor supports multiple capabilities, it is not clear
which algorithm is actually selected. ``none`` always falls back. On
most if not all hardware, this option will probably do nothing, because
a video processor usually supports all modes or none.
``buffer=<num>``
Buffer ``<num>`` frames in the filter chain. This filter is probably pretty
useless, except for debugging. (Note that this won't help to smooth out
latencies with decoding, because the filter will never output a frame if
the buffer isn't full, except on EOF.)