From 734eee1af2c21976e8f57c4ca498593a305fb22e Mon Sep 17 00:00:00 2001 From: Xavier Del Campo Romero Date: Sun, 3 Jan 2021 02:06:58 +0100 Subject: Remove ffmpeg binary from project --- Music/ffmpeg/doc/ffmpeg-utils.html | 1481 ------------------------------------ 1 file changed, 1481 deletions(-) delete mode 100644 Music/ffmpeg/doc/ffmpeg-utils.html (limited to 'Music/ffmpeg/doc/ffmpeg-utils.html') diff --git a/Music/ffmpeg/doc/ffmpeg-utils.html b/Music/ffmpeg/doc/ffmpeg-utils.html deleted file mode 100644 index 53d54d5..0000000 --- a/Music/ffmpeg/doc/ffmpeg-utils.html +++ /dev/null @@ -1,1481 +0,0 @@ - - - - - - - FFmpeg Utilities Documentation - - - - - - -
-

- FFmpeg Utilities Documentation -

-
-
- - - - - -

Table of Contents

- -
- - -
- - - -

1 Description

- -

This document describes some generic features and utilities provided -by the libavutil library. -

- - -

2 Syntax

- -

This section documents the syntax and formats employed by the FFmpeg -libraries and tools. -

- -

2.1 Quoting and escaping

- -

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

- - -

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

-

The function av_get_token defined in -libavutil/avstring.h can be used to parse a token quoted or -escaped according to the rules defined above. -

-

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

- -

2.1.1 Examples

- - - - -

2.2 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 is -interpreted as UTC. -If the year-month-day part is not specified it takes the current -year-month-day. -

- -

2.3 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 minutes -for a maximum of 2 digits, and SS the number of seconds for a -maximum of 2 digits. The m at the end expresses decimal value for -SS. -

-

or -

-
-
[-]S+[.m...]
-
- -

S expresses the number of seconds, with the optional decimal part -m. -

-

In both expressions, the optional ‘-’ indicates negative duration. -

- -

2.3.1 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 -

-
- - -

2.4 Video size

-

Specify the size of the sourced video, it may be a string of the form -widthxheight, 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 -

-
- - -

2.5 Video rate

- -

Specify the frame rate of a video, expressed as the number of frames -generated per second. It has to be a string in the format -frame_rate_num/frame_rate_den, an integer number, a float -number 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 -

-
- - -

2.6 Ratio

- -

A ratio can be expressed as an expression, or in the form -numerator:denominator. -

-

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

-

The undefined value can be expressed using the "0:0" string. -

- -

2.7 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 string -representing the alpha component. -

-

The alpha component may be a string composed by "0x" followed by an -hexadecimal number or a decimal number between 0.0 and 1.0, which -represents the opacity value (‘0x00’ or ‘0.0’ means completely -transparent, ‘0xff’ or ‘1.0’ completely opaque). If the alpha -component 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 -

-
- - -

2.8 Channel Layout

- -

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

-

Individual channels are identified by an id, as given by the table -below: -

-
‘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 the -following 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: -

- -

Starting from libavutil version 53 the trailing character "c" to -specify a number of channels will be required, while a channel layout -mask could also be specified as a decimal number (if and only if not -followed by "c"). -

-

See also the function av_get_channel_layout defined in -libavutil/channel_layout.h. -

- -

3 Expression Evaluation

- -

When evaluating an arithmetic expression, FFmpeg uses an internal -formula evaluator, implemented through the libavutil/eval.h -interface. -

-

An expression may contain unary, binary operators, constants, and -functions. -

-

Two expressions expr1 and expr2 can be combined to form -another expression "expr1;expr2". -expr1 and expr2 are evaluated in turn, and the new -expression 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. -

-
-
between(x, min, max)
-

Return 1 if x is greater than or equal to min and lesser than or -equal 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 to -integers before executing the bitwise operation. -

-

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

-
-
ceil(expr)
-

Round the value of expression expr upwards to the nearest -integer. 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 nearest -integer. 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 and -y 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 a -right triangle with sides of length x and y, or the distance of the -point (x, y) from the origin. -

-
-
if(x, y)
-

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

-
-
if(x, y, z)
-

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

-
-
ifnot(x, y)
-

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

-
-
ifnot(x, y, z)
-

Evaluate x, and if the result is zero return the evaluation -result 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 number -var, which was previously stored with st(var, expr). -The function returns the loaded value. -

-
-
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. If -l 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 the -internal variable which will be used to save the seed/state. -

-
-
root(expr, max)
-

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

-

The expression in expr must denote a continuous function or the -result is undefined. -

-

ld(0) is used to represent the function input value, which means -that the given expression will be evaluated multiple times with -various input values that the expression can access through -ld(0). When the expression evaluates to 0 then the -corresponding input value will be returned. -

-
-
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 internal -variable. var specifies the number of the variable where to -store the value, and it is a value ranging from 0 to 9. The function -returns 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 representing -the 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 times -with 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 nearest -integer. For example, "trunc(-1.5)" is "-1.0". -

-
-
while(cond, expr)
-

Evaluate expression expr while the expression cond is -non-zero, and returns the value of the last expr evaluation, or -NAN 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-zero -value, 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 your -expressions. -

-

The evaluator also recognizes the International System unit prefixes. -If ’i’ is appended after the prefix, binary prefixes are used, which -are based on powers of 1024 instead of powers of 1000. -The ’B’ postfix multiplies the value by 8, and can be appended after a -unit 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, with -indication 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 -

-
- - - -

4 OpenCL Options

- -

When FFmpeg is configured with --enable-opencl, it is possible -to 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 list -which 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 which -can be obtained with ffmpeg -opencl_bench or av_opencl_get_device_list(). -

-
-
- - - -

5 See Also

- -

ffmpeg, ffplay, ffprobe, ffserver, -libavutil -

- - -

6 Authors

- -

The FFmpeg developers. -

-

For details about the authorship, see the Git history of the project -(git://source.ffmpeg.org/ffmpeg), e.g. by typing the command -git log in the FFmpeg source directory, or browsing the -online repository at http://source.ffmpeg.org. -

-

Maintainers for the specific components are listed in the file -MAINTAINERS in the source code tree. -

- - -

- This document was generated using makeinfo. -

-
- - -- cgit v1.2.3