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NAME

ffplay - FFplay media player

SYNOPSIS

ffplay [options] [input_url]

DESCRIPTION

FFplay is a very simple and portable media player using the FFmpeglibraries and the SDL library. It is mostly used as a testbed for thevarious FFmpeg APIs.

OPTIONS

All the numerical options, if not specified otherwise, accept a stringrepresenting a number as input, which may be followed by one of the SIunit prefixes, for example: 'K', 'M', or 'G'.

If 'i' is appended to the SI unit prefix, the complete prefix will beinterpreted as a unit prefix for binary multiples, which are based onpowers of 1024 instead of powers of 1000. Appending 'B' to the SI unitprefix multiplies the value by 8. This allows using, for example:'KB', 'MiB', 'G' and 'B' as number suffixes.

Options which do not take arguments are boolean options, and set thecorresponding value to true. They can be set to false by prefixingthe option name with ``no''. For example using ``-nofoo''will set the boolean option with name ``foo'' to false.

Stream specifiers

Some options are applied per-stream, e.g. bitrate or codec. Stream specifiersare used to precisely specify which stream(s) a given option belongs to.

A stream specifier is a string generally appended to the option name andseparated from it by a colon. E.g. "-codec:a:1 ac3" contains the"a:1" stream specifier, which matches the second audio stream. Therefore, itwould select the ac3 codec for the second audio stream.

A stream specifier can match several streams, so that the option is applied to allof them. E.g. the stream specifier in "-b:a 128k" matches all audiostreams.

An empty stream specifier matches all streams. For example, "-codec copy"or "-codec: copy" would copy all the streams without reencoding.

Possible forms of stream specifiers are:

stream_index: Matches the stream with this index. E.g. "-threads:1 4" would set thethread count for the second stream to 4.
stream_type[:stream_index]: stream_type is one of following: 'v' or 'V' for video, 'a' for audio, 's'for subtitle, 'd' for data, and 't' for attachments. 'v' matches all videostreams, 'V' only matches video streams which are not attached pictures, videothumbnails or cover arts. If stream_index is given, then it matchesstream number stream_index of this type. Otherwise, it matches allstreams of this type.
p:program_id[:stream_index]: If stream_index is given, then it matches the stream with number stream_indexin the program with the id program_id. Otherwise, it matches all streams in theprogram.
#stream_id or i:stream_id: Match the stream by stream id (e.g. PID in MPEG-TS container).
m:key[:value]: Matches streams with the metadata tag key having the specified value. Ifvalue is not given, matches streams that contain the given tag with anyvalue.
u: Matches streams with usable configuration, the codec must be defined and theessential information such as video dimension or audio sample rate must be present.
Note that in ffmpeg, matching by metadata will only work properly forinput files.

Generic options

These options are shared amongst the ff* tools.

-L

Show license.

-h, -?, -help, --help [arg]

Show help. An optional parameter may be specified to print help about a specificitem. If no argument is specified, only basic (non advanced) tooloptions are shown.

Possible values of arg are:

long: Print advanced tool options in addition to the basic tool options.
full: Print complete list of options, including shared and private optionsfor encoders, decoders, demuxers, muxers, filters, etc.
decoder=decoder_name: Print detailed information about the decoder named decoder_name. Use the-decoders option to get a list of all decoders.
encoder=encoder_name: Print detailed information about the encoder named encoder_name. Use the-encoders option to get a list of all encoders.
demuxer=demuxer_name: Print detailed information about the demuxer named demuxer_name. Use the-formats option to get a list of all demuxers and muxers.
muxer=muxer_name: Print detailed information about the muxer named muxer_name. Use the-formats option to get a list of all muxers and demuxers.
filter=filter_name: Print detailed information about the filter name filter_name. Use the-filters option to get a list of all filters.

-version

Show version.

-formats

Show available formats (including devices).

-demuxers

Show available demuxers.

-muxers

Show available muxers.

-devices

Show available devices.

-codecs

Show all codecs known to libavcodec.

Note that the term 'codec' is used throughout this documentation as a shortcutfor what is more correctly called a media bitstream format.

-decoders

Show available decoders.

-encoders

Show all available encoders.

-bsfs

Show available bitstream filters.

-protocols

Show available protocols.

-filters

Show available libavfilter filters.

-pix_fmts

Show available pixel formats.

-sample_fmts

Show available sample formats.

-layouts

Show channel names and standard channel layouts.

-colors

Show recognized color names.

-sources device[,opt1=val1[,opt2=val2]...]

Show autodetected sources of the input device.Some devices may provide system-dependent source names that cannot be autodetected.The returned list cannot be assumed to be always complete.

        ffmpeg -sources pulse,server=192.168.0.4

-sinks device[,opt1=val1[,opt2=val2]...]

Show autodetected sinks of the output device.Some devices may provide system-dependent sink names that cannot be autodetected.The returned list cannot be assumed to be always complete.

        ffmpeg -sinks pulse,server=192.168.0.4

-loglevel [repeat+]loglevel | -v [repeat+]loglevel

Set the logging level used by the library.Adding ``repeat+'' indicates that repeated log output should not be compressedto the first line and the ``Last message repeated n times'' line will beomitted. ``repeat'' can also be used alone.If ``repeat'' is used alone, and with no prior loglevel set, the defaultloglevel will be used. If multiple loglevel parameters are given, using'repeat' will not change the loglevel.loglevel is a string or a number containing one of the following values:

quiet, -8: Show nothing at all; be silent.
panic, 0: Only show fatal errors which could lead the process to crash, such asan assertion failure. This is not currently used for anything.
fatal, 8: Only show fatal errors. These are errors after which the process absolutelycannot continue.
error, 16: Show all errors, including ones which can be recovered from.
warning, 24: Show all warnings and errors. Any message related to possiblyincorrect or unexpected events will be shown.
info, 32: Show informative messages during processing. This is in addition towarnings and errors. This is the default value.
verbose, 40: Same as "info", except more verbose.
debug, 48: Show everything, including debugging information.
trace, 56

: By default the program logs to stderr. If coloring is supported by theterminal, colors are used to mark errors and warnings. Log coloringcan be disabled setting the environment variableAV_LOG_FORCE_NOCOLOR or NO_COLOR, or can be forced settingthe environment variable AV_LOG_FORCE_COLOR.The use of the environment variable NO_COLOR is deprecated andwill be dropped in a future FFmpeg version.

-report

Dump full command line and console output to a file named"program-YYYYMMDD-HHMMSS.log" in the currentdirectory.This file can be useful for bug reports.It also implies "-loglevel verbose".

Setting the environment variable FFREPORT to any value has thesame effect. If the value is a ':'-separated key=value sequence, theseoptions will affect the report; option values must be escaped if theycontain special characters or the options delimiter ':' (see the``Quoting and escaping'' section in the ffmpeg-utils manual).

The following options are recognized:

file: set the file name to use for the report; %p is expanded to the nameof the program, %t is expanded to a timestamp, "%%" is expandedto a plain "%"
level: set the log verbosity level using a numerical value (see "-loglevel").

For example, to output a report to a file named ffreport.logusing a log level of 32 (alias for log level "info"):

        FFREPORT=file=ffreport.log:level=32 ffmpeg -i input output

Errors in parsing the environment variable are not fatal, and will notappear in the report.

-hide_banner

Suppress printing banner.

All FFmpeg tools will normally show a copyright notice, build optionsand library versions. This option can be used to suppress printingthis information.

-cpuflags flags (global)

Allows setting and clearing cpu flags. This option is intendedfor testing. Do not use it unless you know what you're doing.

        ffmpeg -cpuflags -sse+mmx ...        ffmpeg -cpuflags mmx ...        ffmpeg -cpuflags 0 ...

Possible flags for this option are:

x86

mmx
mmxext
sse
sse2
sse2slow
sse3
sse3slow
ssse3
atom
sse4.1
sse4.2
avx
avx2
xop
fma3
fma4
3dnow
3dnowext
bmi1
bmi2
cmov

ARM

armv5te
armv6
armv6t2
vfp
vfpv3
neon
setend

AArch64

armv8
vfp
neon

PowerPC

altivec

Specific Processors

pentium2
pentium3
pentium4
k6
k62
athlon
athlonxp
k8

-opencl_bench

This option is used to benchmark all available OpenCL devices and print theresults. This option is only available when FFmpeg has been compiled with"--enable-opencl".

When FFmpeg is configured with "--enable-opencl", the options for theglobal OpenCL context are set via -opencl_options. See the``OpenCL Options'' section in the ffmpeg-utils manual for the complete list ofsupported options. Amongst others, these options include the ability to selecta specific platform and device to run the OpenCL code on. By default, FFmpegwill run on the first device of the first platform. While the options for theglobal OpenCL context provide flexibility to the user in selecting the OpenCLdevice of their choice, most users would probably want to select the fastestOpenCL device for their system.

This option assists the selection of the most efficient configuration byidentifying the appropriate device for the user's system. The built-inbenchmark is run on all the OpenCL devices and the performance is measured foreach device. The devices in the results list are sorted based on theirperformance with the fastest device listed first. The user can subsequentlyinvoke ffmpeg using the device deemed most appropriate via-opencl_options to obtain the best performance for the OpenCLaccelerated code.

Typical usage to use the fastest OpenCL device involve the following steps.

Run the command:

        ffmpeg -opencl_bench

Note down the platform ID (pidx) and device ID (didx) of the firsti.e. fastest device in the list.Select the platform and device using the command:

        ffmpeg -opencl_options platform_idx=<pidx>:device_idx=<didx> ...

-opencl_options options (global)

Set OpenCL environment options. This option is only available whenFFmpeg has been compiled with "--enable-opencl".

options must be a list of key=value option pairsseparated by ':'. See the ``OpenCL Options'' section in theffmpeg-utils manual for the list of supported options.

AVOptions

These options are provided directly by the libavformat, libavdevice andlibavcodec libraries. To see the list of available AVOptions, use the-help option. They are separated into two categories:

generic: These options can be set for any container, codec or device. Generic optionsare listed under AVFormatContext options for containers/devices and underAVCodecContext options for codecs.
private: These options are specific to the given container, device or codec. Privateoptions are listed under their corresponding containers/devices/codecs.

For example to write an ID3v2.3 header instead of a default ID3v2.4 toan MP3 file, use the id3v2_version private option of the MP3muxer:

        ffmpeg -i input.flac -id3v2_version 3 out.mp3

All codec AVOptions are per-stream, and thus a stream specifiershould be attached to them.

Note: the -nooption syntax cannot be used for booleanAVOptions, use -option 0/-option 1.

Note: the old undocumented way of specifying per-stream AVOptions byprepending v/a/s to the options name is now obsolete and will beremoved soon.

Main options

-x width

Force displayed width.

-y height

Force displayed height.

-s size

Set frame size (WxH or abbreviation), needed for videos which donot contain a header with the frame size like raw YUV. This optionhas been deprecated in favor of private options, try -video_size.

-fs

Start in fullscreen mode.

-an

Disable audio.

-vn

Disable video.

-sn

Disable subtitles.

-ss pos

Seek to pos. Note that in most formats it is not possible to seekexactly, so ffplay will seek to the nearest seek point topos.

pos must be a time duration specification,see the Time duration section in the ffmpeg-utils(1) manual.

-t duration

Play duration seconds of audio/video.

duration must be a time duration specification,see the Time duration section in the ffmpeg-utils(1) manual.

-bytes

Seek by bytes.

-nodisp

Disable graphical display.

-noborder

Borderless window.

-volume

Set the startup volume. 0 means silence, 100 means no volume reduction oramplification. Negative values are treated as 0, values above 100 are treatedas 100.

-f fmt

Force format.

-window_title title

Set window title (default is the input filename).

-loop number

Loops movie playback <number> times. 0 means forever.

-showmode mode

Set the show mode to use.Available values for mode are:

0, video: show video
1, waves: show audio waves
2, rdft: show audio frequency band using RDFT ((Inverse) Real Discrete Fourier Transform)

Default value is ``video'', if video is not present or cannot be played``rdft'' is automatically selected.

You can interactively cycle through the available show modes bypressing the key w.

-vf filtergraph

Create the filtergraph specified by filtergraph and use it tofilter the video stream.

filtergraph is a description of the filtergraph to apply tothe stream, and must have a single video input and a single videooutput. In the filtergraph, the input is associated to the label"in", and the output to the label "out". See theffmpeg-filters manual for more information about the filtergraphsyntax.

You can specify this parameter multiple times and cycle through the specifiedfiltergraphs along with the show modes by pressing the key w.

-af filtergraph

filtergraph is a description of the filtergraph to apply tothe input audio.Use the option ``-filters'' to show all the available filters (includingsources and sinks).

-i input_url

Read input_url.

Advanced options

-pix_fmt format: Set pixel format.This option has been deprecated in favor of private options, try -pixel_format.
-stats: Print several playback statistics, in particular show the streamduration, the codec parameters, the current position in the stream andthe audio/video synchronisation drift. It is on by default, toexplicitly disable it you need to specify "-nostats".
-fast: Non-spec-compliant optimizations.
-genpts: Generate pts.
-sync type: Set the master clock to audio ("type=audio"), video("type=video") or external ("type=ext"). Default is audio. Themaster clock is used to control audio-video synchronization. Most mediaplayers use audio as master clock, but in some cases (streaming or highquality broadcast) it is necessary to change that. This option is mainlyused for debugging purposes.
-ast audio_stream_specifier: Select the desired audio stream using the given stream specifier. The streamspecifiers are described in the Stream specifiers chapter. If this optionis not specified, the ``best'' audio stream is selected in the program of thealready selected video stream.
-vst video_stream_specifier: Select the desired video stream using the given stream specifier. The streamspecifiers are described in the Stream specifiers chapter. If this optionis not specified, the ``best'' video stream is selected.
-sst subtitle_stream_specifier: Select the desired subtitle stream using the given stream specifier. The streamspecifiers are described in the Stream specifiers chapter. If this optionis not specified, the ``best'' subtitle stream is selected in the program of thealready selected video or audio stream.
-autoexit: Exit when video is done playing.
-exitonkeydown: Exit if any key is pressed.
-exitonmousedown: Exit if any mouse button is pressed.
-codec:media_specifier codec_name: Force a specific decoder implementation for the stream identified bymedia_specifier, which can assume the values "a" (audio),"v" (video), and "s" subtitle.
-acodec codec_name: Force a specific audio decoder.
-vcodec codec_name: Force a specific video decoder.
-scodec codec_name: Force a specific subtitle decoder.
-autorotate: Automatically rotate the video according to file metadata. Enabled bydefault, use -noautorotate to disable it.
-framedrop: Drop video frames if video is out of sync. Enabled by default if the masterclock is not set to video. Use this option to enable frame dropping for allmaster clock sources, use -noframedrop to disable it.
-infbuf: Do not limit the input buffer size, read as much data as possible from theinput as soon as possible. Enabled by default for realtime streams, where datamay be dropped if not read in time. Use this option to enable infinite buffersfor all inputs, use -noinfbuf to disable it.

While playing

q, ESC: Quit.
f: Toggle full screen.
p, SPC: Pause.
m: Toggle mute.
9, 0: Decrease and increase volume respectively.
/, *: Decrease and increase volume respectively.
a: Cycle audio channel in the current program.
v: Cycle video channel.
t: Cycle subtitle channel in the current program.
c: Cycle program.
w: Cycle video filters or show modes.
s: Step to the next frame.
Pause if the stream is not already paused, step to the next videoframe, and pause.
left/right: Seek backward/forward 10 seconds.
down/up: Seek backward/forward 1 minute.
page down/page up: Seek to the previous/next chapter.or if there are no chaptersSeek backward/forward 10 minutes.
right mouse click: Seek to percentage in file corresponding to fraction of width.
left mouse double-click: Toggle full screen.

SYNTAX

This section documents the syntax and formats employed by the FFmpeglibraries and tools.

Quoting and escaping

FFmpeg adopts the following quoting and escaping mechanism, unlessexplicitly specified. The following rules are applied:

*: ' and \ are special characters (respectively used forquoting and escaping). In addition to them, there might be otherspecial characters depending on the specific syntax where the escapingand quoting are employed.
*: A special character is escaped by prefixing it with a \.
*: All characters enclosed between '' are included literally in theparsed string. The quote character ' itself cannot be quoted,so you may need to close the quote and escape it.
*: Leading and trailing whitespaces, unless escaped or quoted, areremoved from the parsed string.

Note that you may need to add a second level of escaping when usingthe command line or a script, which depends on the syntax of theadopted shell language.

The function "av_get_token" defined inlibavutil/avstring.h can be used to parse a token quoted orescaped according to the rules defined above.

The tool tools/ffescape in the FFmpeg source tree can be usedto automatically quote or escape a string in a script.

Examples

*

Escape the string "Crime d'Amour" containing the "'" specialcharacter:

        Crime d\'Amour

*

The string above contains a quote, so the "'" needs to be escapedwhen quoting it:

        'Crime d'\''Amour'

*

Include leading or trailing whitespaces using quoting:

        '  this string starts and ends with whitespaces  '

*

Escaping and quoting can be mixed together:

        ' The string '\'string\'' is a string '

*

To include a literal \ you can use either escaping or quoting:

        'c:\foo' can be written as c:\\foo

Date

The accepted syntax is:

        [(YYYY-MM-DD|YYYYMMDD)[T|t| ]]((HH:MM:SS[.m...]]])|(HHMMSS[.m...]]]))[Z]        now

If the value is ``now'' it takes the current time.

Time is local time unless Z is appended, in which case it isinterpreted as UTC.If the year-month-day part is not specified it takes the currentyear-month-day.

Time duration

There are two accepted syntaxes for expressing time duration.

        [-][<HH>:]<MM>:<SS>[.<m>...]

HH expresses the number of hours, MM the number of minutesfor a maximum of 2 digits, and SS the number of seconds for amaximum of 2 digits. The m at the end expresses decimal value forSS.

        [-]<S>+[.<m>...]

S expresses the number of seconds, with the optional decimal partm.

In both expressions, the optional - indicates negative duration.

Examples

The following examples are all valid time duration:

55: 55 seconds
12:03:45: 12 hours, 03 minutes and 45 seconds
23.189: 23.189 seconds

Video size

Specify the size of the sourced video, it may be a string of the formwidthxheight, or the name of a size abbreviation.

The following abbreviations are recognized:

ntsc: 720x480
pal: 720x576
qntsc: 352x240
qpal: 352x288
sntsc: 640x480
spal: 768x576
film: 352x240
ntsc-film: 352x240
sqcif: 128x96
qcif: 176x144
cif: 352x288
4cif: 704x576
16cif: 1408x1152
qqvga: 160x120
qvga: 320x240
vga: 640x480
svga: 800x600
xga: 1024x768
uxga: 1600x1200
qxga: 2048x1536
sxga: 1280x1024
qsxga: 2560x2048
hsxga: 5120x4096
wvga: 852x480
wxga: 1366x768
wsxga: 1600x1024
wuxga: 1920x1200
woxga: 2560x1600
wqsxga: 3200x2048
wquxga: 3840x2400
whsxga: 6400x4096
whuxga: 7680x4800
cga: 320x200
ega: 640x350
hd480: 852x480
hd720: 1280x720
hd1080: 1920x1080
2k: 2048x1080
2kflat: 1998x1080
2kscope: 2048x858
4k: 4096x2160
4kflat: 3996x2160
4kscope: 4096x1716
nhd: 640x360
hqvga: 240x160
wqvga: 400x240
fwqvga: 432x240
hvga: 480x320
qhd: 960x540
2kdci: 2048x1080
4kdci: 4096x2160
uhd2160: 3840x2160
uhd4320: 7680x4320

Video rate

Specify the frame rate of a video, expressed as the number of framesgenerated per second. It has to be a string in the formatframe_rate_num/frame_rate_den, an integer number, a floatnumber or a valid video frame rate abbreviation.

The following abbreviations are recognized:

ntsc: 30000/1001
pal: 25/1
qntsc: 30000/1001
qpal: 25/1
sntsc: 30000/1001
spal: 25/1
film: 24/1
ntsc-film: 24000/1001

Ratio

A ratio can be expressed as an expression, or in the formnumerator:denominator.

Note that a ratio with infinite (1/0) or negative value isconsidered valid, so you should check on the returned value if youwant to exclude those values.

The undefined value can be expressed using the ``0:0'' string.

Color

It can be the name of a color as defined below (case insensitive match) or a"[0x|#]RRGGBB[AA]" sequence, possibly followed by @ and a stringrepresenting the alpha component.

The alpha component may be a string composed by ``0x'' followed by anhexadecimal number or a decimal number between 0.0 and 1.0, whichrepresents the opacity value (0x00 or 0.0 means completelytransparent, 0xff or 1.0 completely opaque). If the alphacomponent is not specified then 0xff is assumed.

The string random will result in a random color.

The following names of colors are recognized:

AliceBlue: 0xF0F8FF
AntiqueWhite: 0xFAEBD7
Aqua: 0x00FFFF
Aquamarine: 0x7FFFD4
Azure: 0xF0FFFF
Beige: 0xF5F5DC
Bisque: 0xFFE4C4
Black: 0x000000
BlanchedAlmond: 0xFFEBCD
Blue: 0x0000FF
BlueViolet: 0x8A2BE2
Brown: 0xA52A2A
BurlyWood: 0xDEB887
CadetBlue: 0x5F9EA0
Chartreuse: 0x7FFF00
Chocolate: 0xD2691E
Coral: 0xFF7F50
CornflowerBlue: 0x6495ED
Cornsilk: 0xFFF8DC
Crimson: 0xDC143C
Cyan: 0x00FFFF
DarkBlue: 0x00008B
DarkCyan: 0x008B8B
DarkGoldenRod: 0xB8860B
DarkGray: 0xA9A9A9
DarkGreen: 0x006400
DarkKhaki: 0xBDB76B
DarkMagenta: 0x8B008B
DarkOliveGreen: 0x556B2F
Darkorange: 0xFF8C00
DarkOrchid: 0x9932CC
DarkRed: 0x8B0000
DarkSalmon: 0xE9967A
DarkSeaGreen: 0x8FBC8F
DarkSlateBlue: 0x483D8B
DarkSlateGray: 0x2F4F4F
DarkTurquoise: 0x00CED1
DarkViolet: 0x9400D3
DeepPink: 0xFF1493
DeepSkyBlue: 0x00BFFF
DimGray: 0x696969
DodgerBlue: 0x1E90FF
FireBrick: 0xB22222
FloralWhite: 0xFFFAF0
ForestGreen: 0x228B22
Fuchsia: 0xFF00FF
Gainsboro: 0xDCDCDC
GhostWhite: 0xF8F8FF
Gold: 0xFFD700
GoldenRod: 0xDAA520
Gray: 0x808080
Green: 0x008000
GreenYellow: 0xADFF2F
HoneyDew: 0xF0FFF0
HotPink: 0xFF69B4
IndianRed: 0xCD5C5C
Indigo: 0x4B0082
Ivory: 0xFFFFF0
Khaki: 0xF0E68C
Lavender: 0xE6E6FA
LavenderBlush: 0xFFF0F5
LawnGreen: 0x7CFC00
LemonChiffon: 0xFFFACD
LightBlue: 0xADD8E6
LightCoral: 0xF08080
LightCyan: 0xE0FFFF
LightGoldenRodYellow: 0xFAFAD2
LightGreen: 0x90EE90
LightGrey: 0xD3D3D3
LightPink: 0xFFB6C1
LightSalmon: 0xFFA07A
LightSeaGreen: 0x20B2AA
LightSkyBlue: 0x87CEFA
LightSlateGray: 0x778899
LightSteelBlue: 0xB0C4DE
LightYellow: 0xFFFFE0
Lime: 0x00FF00
LimeGreen: 0x32CD32
Linen: 0xFAF0E6
Magenta: 0xFF00FF
Maroon: 0x800000
MediumAquaMarine: 0x66CDAA
MediumBlue: 0x0000CD
MediumOrchid: 0xBA55D3
MediumPurple: 0x9370D8
MediumSeaGreen: 0x3CB371
MediumSlateBlue: 0x7B68EE
MediumSpringGreen: 0x00FA9A
MediumTurquoise: 0x48D1CC
MediumVioletRed: 0xC71585
MidnightBlue: 0x191970
MintCream: 0xF5FFFA
MistyRose: 0xFFE4E1
Moccasin: 0xFFE4B5
NavajoWhite: 0xFFDEAD
Navy: 0x000080
OldLace: 0xFDF5E6
Olive: 0x808000
OliveDrab: 0x6B8E23
Orange: 0xFFA500
OrangeRed: 0xFF4500
Orchid: 0xDA70D6
PaleGoldenRod: 0xEEE8AA
PaleGreen: 0x98FB98
PaleTurquoise: 0xAFEEEE
PaleVioletRed: 0xD87093
PapayaWhip: 0xFFEFD5
PeachPuff: 0xFFDAB9
Peru: 0xCD853F
Pink: 0xFFC0CB
Plum: 0xDDA0DD
PowderBlue: 0xB0E0E6
Purple: 0x800080
Red: 0xFF0000
RosyBrown: 0xBC8F8F
RoyalBlue: 0x4169E1
SaddleBrown: 0x8B4513
Salmon: 0xFA8072
SandyBrown: 0xF4A460
SeaGreen: 0x2E8B57
SeaShell: 0xFFF5EE
Sienna: 0xA0522D
Silver: 0xC0C0C0
SkyBlue: 0x87CEEB
SlateBlue: 0x6A5ACD
SlateGray: 0x708090
Snow: 0xFFFAFA
SpringGreen: 0x00FF7F
SteelBlue: 0x4682B4
Tan: 0xD2B48C
Teal: 0x008080
Thistle: 0xD8BFD8
Tomato: 0xFF6347
Turquoise: 0x40E0D0
Violet: 0xEE82EE
Wheat: 0xF5DEB3
White: 0xFFFFFF
WhiteSmoke: 0xF5F5F5
Yellow: 0xFFFF00
YellowGreen: 0x9ACD32

Channel Layout

A channel layout specifies the spatial disposition of the channels ina multi-channel audio stream. To specify a channel layout, FFmpegmakes use of a special syntax.

Individual channels are identified by an id, as given by the tablebelow:

FL: front left
FR: front right
FC: front center
LFE: low frequency
BL: back left
BR: back right
FLC: front left-of-center
FRC: front right-of-center
BC: back center
SL: side left
SR: side right
TC: top center
TFL: top front left
TFC: top front center
TFR: top front right
TBL: top back left
TBC: top back center
TBR: top back right
DL: downmix left
DR: downmix right
WL: wide left
WR: wide right
SDL: surround direct left
SDR: surround direct right
LFE2: low frequency 2

Standard channel layout compositions can be specified by using thefollowing identifiers:

mono: FC
stereo: FL+FR
2.1: FL+FR+LFE
3.0: FL+FR+FC
3.0(back): FL+FR+BC
4.0: FL+FR+FC+BC
quad: FL+FR+BL+BR
quad(side): FL+FR+SL+SR
3.1: FL+FR+FC+LFE
5.0: FL+FR+FC+BL+BR
5.0(side): FL+FR+FC+SL+SR
4.1: FL+FR+FC+LFE+BC
5.1: FL+FR+FC+LFE+BL+BR
5.1(side): FL+FR+FC+LFE+SL+SR
6.0: FL+FR+FC+BC+SL+SR
6.0(front): FL+FR+FLC+FRC+SL+SR
hexagonal: FL+FR+FC+BL+BR+BC
6.1: FL+FR+FC+LFE+BC+SL+SR
6.1: FL+FR+FC+LFE+BL+BR+BC
6.1(front): FL+FR+LFE+FLC+FRC+SL+SR
7.0: FL+FR+FC+BL+BR+SL+SR
7.0(front): FL+FR+FC+FLC+FRC+SL+SR
7.1: FL+FR+FC+LFE+BL+BR+SL+SR
7.1(wide): FL+FR+FC+LFE+BL+BR+FLC+FRC
7.1(wide-side): FL+FR+FC+LFE+FLC+FRC+SL+SR
octagonal: FL+FR+FC+BL+BR+BC+SL+SR
downmix: DL+DR

A custom channel layout can be specified as a sequence of terms, separated by'+' or '|'. Each term can be:

*: the name of a standard channel layout (e.g. mono,stereo, 4.0, quad, 5.0, etc.)
*: the name of a single channel (e.g. FL, FR, FC, LFE, etc.)
*: a number of channels, in decimal, followed by 'c', yielding the default channellayout for that number of channels (see the function"av_get_default_channel_layout"). Note that not all channel counts have adefault layout.
*: a number of channels, in decimal, followed by 'C', yielding an unknown channellayout with the specified number of channels. Note that not all channel layoutspecification strings support unknown channel layouts.
*: a channel layout mask, in hexadecimal starting with ``0x'' (see the"AV_CH_*" macros in libavutil/channel_layout.h.

Before libavutil version 53 the trailing character ``c'' to specify a number ofchannels was optional, but now it is required, while a channel layout mask canalso be specified as a decimal number (if and only if not followed by ``c'' or ``C'').

See also the function "av_get_channel_layout" defined inlibavutil/channel_layout.h.

EXPRESSION EVALUATION

When evaluating an arithmetic expression, FFmpeg uses an internalformula evaluator, implemented through the libavutil/eval.hinterface.

An expression may contain unary, binary operators, constants, andfunctions.

Two expressions expr1 and expr2 can be combined to formanother expression "expr1;expr2".expr1 and expr2 are evaluated in turn, and the newexpression evaluates to the value of expr2.

The following binary operators are available: "+", "-","*", "/", "^".

The following unary operators are available: "+", "-".

The following functions are available:

abs(x)

Compute absolute value of x.

acos(x)

Compute arccosine of x.

asin(x)

Compute arcsine of x.

atan(x)

Compute arctangent of x.

atan2(x, y)

Compute principal value of the arc tangent of y/x.

between(x, min, max)

Return 1 if x is greater than or equal to min and lesser than orequal to max, 0 otherwise.

bitand(x, y)

bitor(x, y)

Compute bitwise and/or operation on x and y.

The results of the evaluation of x and y are converted tointegers before executing the bitwise operation.

Note that both the conversion to integer and the conversion back tofloating point can lose precision. Beware of unexpected results forlarge numbers (usually 2^53 and larger).

ceil(expr)

Round the value of expression expr upwards to the nearestinteger. For example, ``ceil(1.5)'' is ``2.0''.

clip(x, min, max)

Return the value of x clipped between min and max.

cos(x)

Compute cosine of x.

cosh(x)

Compute hyperbolic cosine of x.

eq(x, y)

Return 1 if x and y are equivalent, 0 otherwise.

exp(x)

Compute exponential of x (with base "e", the Euler's number).

floor(expr)

Round the value of expression expr downwards to the nearestinteger. For example, ``floor(-1.5)'' is ``-2.0''.

gauss(x)

Compute Gauss function of x, corresponding to"exp(-x*x/2) / sqrt(2*PI)".

gcd(x, y)

Return the greatest common divisor of x and y. If both x andy are 0 or either or both are less than zero then behavior is undefined.

gt(x, y)

Return 1 if x is greater than y, 0 otherwise.

gte(x, y)

Return 1 if x is greater than or equal to y, 0 otherwise.

hypot(x, y)

This function is similar to the C function with the same name; it returns"sqrt(x*x + y*y)", the length of the hypotenuse of aright triangle with sides of length x and y, or the distance of thepoint (x, y) from the origin.

if(x, y)

Evaluate x, and if the result is non-zero return the result ofthe evaluation of y, return 0 otherwise.

if(x, y, z)

Evaluate x, and if the result is non-zero return the evaluationresult of y, otherwise the evaluation result of z.

ifnot(x, y)

Evaluate x, and if the result is zero return the result of theevaluation of y, return 0 otherwise.

ifnot(x, y, z)

Evaluate x, and if the result is zero return the evaluationresult of y, otherwise the evaluation result of z.

isinf(x)

Return 1.0 if x is +/-INFINITY, 0.0 otherwise.

isnan(x)

Return 1.0 if x is NAN, 0.0 otherwise.

ld(var)

Load the value of the internal variable with numbervar, which was previously stored with st(var, expr).The function returns the loaded value.

lerp(x, y, z)

Return linear interpolation between x and y by amount of z.

log(x)

Compute natural logarithm of x.

lt(x, y)

Return 1 if x is lesser than y, 0 otherwise.

lte(x, y)

Return 1 if x is lesser than or equal to y, 0 otherwise.

max(x, y)

Return the maximum between x and y.

min(x, y)

Return the minimum between x and y.

mod(x, y)

Compute the remainder of division of x by y.

not(expr)

Return 1.0 if expr is zero, 0.0 otherwise.

pow(x, y)

Compute the power of x elevated y, it is equivalent to"(x)^(y)".

print(t)

print(t, l)

Print the value of expression t with loglevel l. Ifl is not specified then a default log level is used.Returns the value of the expression printed.

Prints t with loglevel l

random(x)

Return a pseudo random value between 0.0 and 1.0. x is the index of theinternal variable which will be used to save the seed/state.

root(expr, max)

Find an input value for which the function represented by exprwith argument ld(0) is 0 in the interval 0..max.

The expression in expr must denote a continuous function or theresult is undefined.

ld(0) is used to represent the function input value, which meansthat the given expression will be evaluated multiple times withvarious input values that the expression can access throughld(0). When the expression evaluates to 0 then thecorresponding input value will be returned.

round(expr)

Round the value of expression expr to the nearest integer. For example, ``round(1.5)'' is ``2.0''.

sin(x)

Compute sine of x.

sinh(x)

Compute hyperbolic sine of x.

sqrt(expr)

Compute the square root of expr. This is equivalent to"(expr)^.5".

squish(x)

Compute expression "1/(1 + exp(4*x))".

st(var, expr)

Store the value of the expression expr in an internalvariable. var specifies the number of the variable where tostore the value, and it is a value ranging from 0 to 9. The functionreturns the value stored in the internal variable.Note, Variables are currently not shared between expressions.

tan(x)

Compute tangent of x.

tanh(x)

Compute hyperbolic tangent of x.

taylor(expr, x)

taylor(expr, x, id)

Evaluate a Taylor series at x, given an expression representingthe "ld(id)"-th derivative of a function at 0.

When the series does not converge the result is undefined.

ld(id) is used to represent the derivative order in expr,which means that the given expression will be evaluated multiple timeswith various input values that the expression can access through"ld(id)". If id is not specified then 0 is assumed.

Note, when you have the derivatives at y instead of 0,"taylor(expr, x-y)" can be used.

time(0)

Return the current (wallclock) time in seconds.

trunc(expr)

Round the value of expression expr towards zero to the nearestinteger. For example, ``trunc(-1.5)'' is ``-1.0''.

while(cond, expr)

Evaluate expression expr while the expression cond isnon-zero, and returns the value of the last expr evaluation, orNAN if cond was always false.

The following constants are available:

PI: area of the unit disc, approximately 3.14
E: exp(1) (Euler's number), approximately 2.718
PHI: golden ratio (1+sqrt(5))/2, approximately 1.618

Assuming that an expression is considered ``true'' if it has a non-zerovalue, note that:

"*" works like AND

"+" works like OR

For example the construct:

        if (A AND B) then C

is equivalent to:

        if(A*B, C)

In your C code, you can extend the list of unary and binary functions,and define recognized constants, so that they are available for yourexpressions.

The evaluator also recognizes the International System unit prefixes.If 'i' is appended after the prefix, binary prefixes are used, whichare based on powers of 1024 instead of powers of 1000.The 'B' postfix multiplies the value by 8, and can be appended after aunit prefix or used alone. This allows using for example 'KB', 'MiB','G' and 'B' as number postfix.

The list of available International System prefixes follows, withindication of the corresponding powers of 10 and of 2.

y: 10^-24 / 2^-80
z: 10^-21 / 2^-70
a: 10^-18 / 2^-60
f: 10^-15 / 2^-50
p: 10^-12 / 2^-40
n: 10^-9 / 2^-30
u: 10^-6 / 2^-20
m: 10^-3 / 2^-10
c: 10^-2
d: 10^-1
h: 10^2
k: 10^3 / 2^10
K: 10^3 / 2^10
M: 10^6 / 2^20
G: 10^9 / 2^30
T: 10^12 / 2^40
P: 10^15 / 2^40
E: 10^18 / 2^50
Z: 10^21 / 2^60
Y: 10^24 / 2^70

OPENCL OPTIONS

When FFmpeg is configured with "--enable-opencl", it is possibleto set the options for the global OpenCL context.

The list of supported options follows:

build_options: Set build options used to compile the registered kernels.
See reference ``OpenCL Specification Version: 1.2 chapter 5.6.4''.
platform_idx: Select the index of the platform to run OpenCL code.
The specified index must be one of the indexes in the device listwhich can be obtained with "ffmpeg -opencl_bench" or "av_opencl_get_device_list()".
device_idx: Select the index of the device used to run OpenCL code.
The specified index must be one of the indexes in the device list whichcan be obtained with "ffmpeg -opencl_bench" or "av_opencl_get_device_list()".

CODEC OPTIONS

libavcodec provides some generic global options, which can be set onall the encoders and decoders. In addition each codec may supportso-called private options, which are specific for a given codec.

Sometimes, a global option may only affect a specific kind of codec,and may be nonsensical or ignored by another, so you need to be awareof the meaning of the specified options. Also some options aremeant only for decoding or encoding.

Options may be set by specifying -option value in theFFmpeg tools, or by setting the value explicitly in the"AVCodecContext" options or using the libavutil/opt.h APIfor programmatic use.

The list of supported options follow:

b integer (encoding,audio,video)

Set bitrate in bits/s. Default value is 200K.

ab integer (encoding,audio)

Set audio bitrate (in bits/s). Default value is 128K.

bt integer (encoding,video)

Set video bitrate tolerance (in bits/s). In 1-pass mode, bitratetolerance specifies how far ratecontrol is willing to deviate from thetarget average bitrate value. This is not related to min/maxbitrate. Lowering tolerance too much has an adverse effect on quality.

flags flags (decoding/encoding,audio,video,subtitles)

Set generic flags.

Possible values:

mv4: Use four motion vector by macroblock (mpeg4).
qpel: Use 1/4 pel motion compensation.
loop: Use loop filter.
qscale: Use fixed qscale.
gmc: Use gmc.
mv0: Always try a mb with mv=<0,0>.
input_preserved
pass1: Use internal 2pass ratecontrol in first pass mode.