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Linshizhi
ffmpeg.wasm-core
Commits
2e2fa2d6
Commit
2e2fa2d6
authored
Apr 13, 2020
by
Gyan Doshi
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doc/filters: clarify metadata and logging for blackdetect
parent
4e0cf81b
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filters.texi
doc/filters.texi
+14
-5
vf_blackdetect.c
libavfilter/vf_blackdetect.c
+0
-1
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doc/filters.texi
View file @
2e2fa2d6
...
@@ -6532,11 +6532,20 @@ Default is disabled.
...
@@ -6532,11 +6532,20 @@ Default is disabled.
Detect video intervals that are (almost) completely black. Can be
Detect video intervals that are (almost) completely black. Can be
useful to detect chapter transitions, commercials, or invalid
useful to detect chapter transitions, commercials, or invalid
recordings. Output lines contains the time for the start, end and
recordings.
duration of the detected black interval expressed in seconds.
The filter outputs its detection analysis to both the log as well as
In order to display the output lines, you need to set the loglevel at
frame metadata. If a black segment of at least the specified minimum
least to the AV_LOG_INFO value.
duration is found, a line with the start and end timestamps as well
as duration is printed to the log with level @code{info}. In addition,
a log line with level @code{debug} is printed per frame showing the
black amount detected for that frame.
The filter also attaches metadata to the first frame of a black
segment with key @code{lavfi.black_start} and to the first frame
after the black segment ends with key @code{lavfi.black_end}. The
value is the frame'
s
timestamp
.
This
metadata
is
added
regardless
of
the
minimum
duration
specified
.
The
filter
accepts
the
following
options
:
The
filter
accepts
the
following
options
:
...
...
libavfilter/vf_blackdetect.c
View file @
2e2fa2d6
...
@@ -136,7 +136,6 @@ static int request_frame(AVFilterLink *outlink)
...
@@ -136,7 +136,6 @@ static int request_frame(AVFilterLink *outlink)
return
ret
;
return
ret
;
}
}
// TODO: document metadata
static
int
filter_frame
(
AVFilterLink
*
inlink
,
AVFrame
*
picref
)
static
int
filter_frame
(
AVFilterLink
*
inlink
,
AVFrame
*
picref
)
{
{
AVFilterContext
*
ctx
=
inlink
->
dst
;
AVFilterContext
*
ctx
=
inlink
->
dst
;
...
...
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