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doc/filters/drawtext: clarify meaning of strftime format string

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Also clarify what should be used instead of the strftime expansion mode.
This commit is contained in:
Stefano Sabatini 2023-03-26 17:29:12 +02:00
parent 57271e4a68
commit 030b34eac9
1 changed files with 15 additions and 13 deletions
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doc/filters.texi
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@ -12103,13 +12103,12 @@ The default value of @var{bordercolor} is "black".
@item expansion
Select how the @var{text} is expanded. Can be either @code{none},
@code{strftime} (deprecated) or
@code{normal} (default). See the @ref{drawtext_expansion, Text expansion} section
below for details.
@code{strftime} (deprecated) or @code{normal} (default). See the
@ref{drawtext_expansion, Text expansion} section below for details.
@item basetime
Set a start time for the count. Value is in microseconds. Only applied
in the deprecated strftime expansion mode. To emulate in normal expansion
in the deprecated @code{strftime} expansion mode. To emulate in normal expansion
mode use the @code{pts} function, supplying the start time (in seconds)
as the second argument.
@ -12340,10 +12339,12 @@ The current packet's size (in bytes).
@anchor{drawtext_expansion}
@subsection Text expansion
If @option{expansion} is set to @code{strftime},
the filter recognizes strftime() sequences in the provided text and
expands them accordingly. Check the documentation of strftime(). This
feature is deprecated.
If @option{expansion} is set to @code{strftime}, the filter recognizes
sequences accepted by the @code{strftime} C function in the provided
text and expands them accordingly. Check the documentation of
@code{strftime}. This feature is deprecated in favor of @code{normal}
expansion with the @code{gmtime} or @code{localtime} expansion
functions.
If @option{expansion} is set to @code{none}, the text is printed verbatim.
@ -12390,13 +12391,13 @@ It can be used to add padding with zeros from the left.
@item gmtime
The time at which the filter is running, expressed in UTC.
It can accept an argument: a strftime() format string.
It can accept an argument: a @code{strftime} C function format string.
The format string is extended to support the variable @var{%[1-6]N}
which prints fractions of the second with optionally specified number of digits.
@item localtime
The time at which the filter is running, expressed in the local time zone.
It can accept an argument: a strftime() format string.
It can accept an argument: a @code{strftime} C function format string.
The format string is extended to support the variable @var{%[1-6]N}
which prints fractions of the second with optionally specified number of digits.
@ -12438,8 +12439,8 @@ If the format is set to @code{hms}, a third argument @code{24HH} may be
supplied to present the hour part of the formatted timestamp in 24h format
(00-23).
If the format is set to @code{localtime} or @code{gmtime},
a third argument may be supplied: a strftime() format string.
If the format is set to @code{localtime} or @code{gmtime}, a third
argument may be supplied: a @code{strftime} C function format string.
By default, @var{YYYY-MM-DD HH:MM:SS} format will be used.
@end table
@ -12543,7 +12544,8 @@ drawtext="text='Test Text': fontsize=h/30: x=(w-text_w)/2: y=(h-text_h*2)"
@end example
@item
Print the date of a real-time encoding (see strftime(3)):
Print the date of a real-time encoding (see documentation for the
@code{strftime} C function):
@example
drawtext='fontfile=FreeSans.ttf:text=%@{localtime\:%a %b %d %Y@}'
@end example