4 When evaluating specific formats, FFmpeg uses internal library parsing
5 functions, shared by the tools. This section documents the syntax of
11 The accepted syntax is:
13 [(YYYY-MM-DD|YYYYMMDD)[T|t| ]]((HH:MM:SS[.m...]]])|(HHMMSS[.m...]]]))[Z]
17 If the value is "now" it takes the current time.
19 Time is local time unless Z is appended, in which case it is
21 If the year-month-day part is not specified it takes the current
24 @anchor{time duration syntax}
25 @section Time duration
27 The accepted syntax is:
33 @var{HH} expresses the number of hours, @var{MM} the number a of minutes
34 and @var{SS} the number of seconds.
36 @anchor{video size syntax}
38 Specify the size of the sourced video, it may be a string of the form
39 @var{width}x@var{height}, or the name of a size abbreviation.
41 The following abbreviations are recognized:
103 @anchor{video rate syntax}
106 Specify the frame rate of a video, expressed as the number of frames
107 generated per second. It has to be a string in the format
108 @var{frame_rate_num}/@var{frame_rate_den}, an integer number, a float
109 number or a valid video frame rate abbreviation.
111 The following abbreviations are recognized:
131 @anchor{ratio syntax}
134 A ratio can be expressed as an expression, or in the form
135 @var{numerator}:@var{denominator}.
137 Note that a ratio with infinite (1/0) or negative value is
138 considered valid, so you should check on the returned value if you
139 want to exclude those values.
141 The undefined value can be expressed using the "0:0" string.
143 @anchor{color syntax}
146 It can be the name of a color (case insensitive match) or a
147 [0x|#]RRGGBB[AA] sequence, possibly followed by "@@" and a string
148 representing the alpha component.
150 The alpha component may be a string composed by "0x" followed by an
151 hexadecimal number or a decimal number between 0.0 and 1.0, which
152 represents the opacity value (0x00/0.0 means completely transparent,
153 0xff/1.0 completely opaque).
154 If the alpha component is not specified then 0xff is assumed.
156 The string "random" will result in a random color.