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158 lines
3.0 KiB
158 lines
3.0 KiB
@chapter Syntax |
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@c man begin SYNTAX |
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When evaluating specific formats, FFmpeg uses internal library parsing |
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functions, shared by the tools. This section documents the syntax of |
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some of these formats. |
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@anchor{date syntax} |
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@section Date |
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The accepted syntax is: |
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@example |
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[(YYYY-MM-DD|YYYYMMDD)[T|t| ]]((HH:MM:SS[.m...]]])|(HHMMSS[.m...]]]))[Z] |
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now |
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@end example |
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If the value is "now" it takes the current time. |
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Time is local time unless Z is appended, in which case it is |
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interpreted as UTC. |
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If the year-month-day part is not specified it takes the current |
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year-month-day. |
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@anchor{time duration syntax} |
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@section Time duration |
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The accepted syntax is: |
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@example |
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[-]HH:MM:SS[.m...] |
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[-]S+[.m...] |
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@end example |
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@var{HH} expresses the number of hours, @var{MM} the number a of minutes |
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and @var{SS} the number of seconds. |
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@anchor{video size syntax} |
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@section Video size |
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Specify the size of the sourced video, it may be a string of the form |
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@var{width}x@var{height}, or the name of a size abbreviation. |
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The following abbreviations are recognized: |
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@table @samp |
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@item sqcif |
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128x96 |
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@item qcif |
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176x144 |
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@item cif |
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352x288 |
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@item 4cif |
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704x576 |
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@item 16cif |
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1408x1152 |
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@item qqvga |
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160x120 |
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@item qvga |
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320x240 |
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@item vga |
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640x480 |
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@item svga |
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800x600 |
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@item xga |
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1024x768 |
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@item uxga |
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1600x1200 |
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@item qxga |
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2048x1536 |
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@item sxga |
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1280x1024 |
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@item qsxga |
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2560x2048 |
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@item hsxga |
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5120x4096 |
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@item wvga |
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852x480 |
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@item wxga |
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1366x768 |
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@item wsxga |
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1600x1024 |
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@item wuxga |
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1920x1200 |
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@item woxga |
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2560x1600 |
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@item wqsxga |
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3200x2048 |
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@item wquxga |
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3840x2400 |
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@item whsxga |
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6400x4096 |
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@item whuxga |
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7680x4800 |
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@item cga |
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320x200 |
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@item ega |
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640x350 |
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@item hd480 |
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852x480 |
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@item hd720 |
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1280x720 |
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@item hd1080 |
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1920x1080 |
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@end table |
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@anchor{video rate syntax} |
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@section Video rate |
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Specify the frame rate of a video, expressed as the number of frames |
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generated per second. It has to be a string in the format |
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@var{frame_rate_num}/@var{frame_rate_den}, an integer number, a float |
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number or a valid video frame rate abbreviation. |
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The following abbreviations are recognized: |
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@table @samp |
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@item ntsc |
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30000/1001 |
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@item pal |
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25/1 |
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@item qntsc |
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30000/1 |
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@item qpal |
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25/1 |
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@item sntsc |
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30000/1 |
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@item spal |
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25/1 |
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@item film |
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24/1 |
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@item ntsc-film |
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24000/1 |
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@end table |
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@anchor{ratio syntax} |
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@section Ratio |
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A ratio can be expressed as an expression, or in the form |
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@var{numerator}:@var{denominator}. |
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Note that a ratio with infinite (1/0) or negative value is |
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considered valid, so you should check on the returned value if you |
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want to exclude those values. |
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The undefined value can be expressed using the "0:0" string. |
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@anchor{color syntax} |
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@section Color |
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It can be the name of a color (case insensitive match) or a |
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[0x|#]RRGGBB[AA] sequence, possibly followed by "@@" and a string |
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representing the alpha component. |
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The alpha component may be a string composed by "0x" followed by an |
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hexadecimal number or a decimal number between 0.0 and 1.0, which |
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represents the opacity value (0x00/0.0 means completely transparent, |
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0xff/1.0 completely opaque). |
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If the alpha component is not specified then 0xff is assumed. |
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The string "random" will result in a random color. |
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@c man end SYNTAX
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