| Message ID | 20230326192244.65852-1-stefasab@gmail.com |
|---|---|
| State | New |
| Headers | show |
| Series | [FFmpeg-devel] doc/filters/find_rect: extend documentation | expand |
| Context | Check | Description |
|---|---|---|
| andriy/make_x86 | success | Make finished |
| andriy/make_fate_x86 | success | Make fate finished |
On date Sunday 2023-03-26 21:22:44 +0200, Stefano Sabatini wrote: > Document metadata entries set by the filter, extend and clarify > options, add additional example showing how to extract the generated > data. > > Fix issue: > http://trac.ffmpeg.org/ticket/8766 > --- > doc/filters.texi | 41 +++++++++++++++++++++++++++++++++++++++-- > 1 file changed, 39 insertions(+), 2 deletions(-) Up with more details about the score.
On date Sunday 2023-03-26 21:34:20 +0200, Stefano Sabatini wrote: > On date Sunday 2023-03-26 21:22:44 +0200, Stefano Sabatini wrote: > > Document metadata entries set by the filter, extend and clarify > > options, add additional example showing how to extract the generated > > data. > > > > Fix issue: > > http://trac.ffmpeg.org/ticket/8766 > > --- > > doc/filters.texi | 41 +++++++++++++++++++++++++++++++++++++++-- > > 1 file changed, 39 insertions(+), 2 deletions(-) > > Up with more details about the score. > From 9f6b66f4bb0caa07f97685f4ebddf21ec212386d Mon Sep 17 00:00:00 2001 > From: Stefano Sabatini <stefasab@gmail.com> > Date: Sun, 26 Mar 2023 21:21:50 +0200 > Subject: [PATCH] doc/filters/find_rect: extend documentation > > Document metadata entries set by the filter, extend and clarify > options, add additional example showing how to extract the generated > data. > > Address issue: > http://trac.ffmpeg.org/ticket/8766 > --- > doc/filters.texi | 47 +++++++++++++++++++++++++++++++++++++++++++++-- > 1 file changed, 45 insertions(+), 2 deletions(-) Will apply tomorrow if I see no comments.
On date Sunday 2023-04-02 01:47:15 +0200, Stefano Sabatini wrote: > On date Sunday 2023-03-26 21:34:20 +0200, Stefano Sabatini wrote: > > On date Sunday 2023-03-26 21:22:44 +0200, Stefano Sabatini wrote: > > > Document metadata entries set by the filter, extend and clarify > > > options, add additional example showing how to extract the generated > > > data. > > > > > > Fix issue: > > > http://trac.ffmpeg.org/ticket/8766 > > > --- > > > doc/filters.texi | 41 +++++++++++++++++++++++++++++++++++++++-- > > > 1 file changed, 39 insertions(+), 2 deletions(-) > > > > Up with more details about the score. > > > From 9f6b66f4bb0caa07f97685f4ebddf21ec212386d Mon Sep 17 00:00:00 2001 > > From: Stefano Sabatini <stefasab@gmail.com> > > Date: Sun, 26 Mar 2023 21:21:50 +0200 > > Subject: [PATCH] doc/filters/find_rect: extend documentation > > > > Document metadata entries set by the filter, extend and clarify > > options, add additional example showing how to extract the generated > > data. > > > > Address issue: > > http://trac.ffmpeg.org/ticket/8766 > > --- > > doc/filters.texi | 47 +++++++++++++++++++++++++++++++++++++++++++++-- > > 1 file changed, 45 insertions(+), 2 deletions(-) > > Will apply tomorrow if I see no comments. Applied.
diff --git a/doc/filters.texi b/doc/filters.texi index 1980fa6888..11406cb076 100644 --- a/doc/filters.texi +++ b/doc/filters.texi @@ -13768,7 +13768,29 @@ value. @section find_rect -Find a rectangular object +Find a rectangular object in the input video. + +The object to search for must be specified as a gray8 image specified with the +@option{object} option. + +If the input video contains multiple instances of the object, the filter will +find only one of them. + +When an object is found, the following metadata entries are set in the matching +frame: +@table @option +@item lavfi.rect.w +width of object + +@item lavfi.rect.h +height of object + +@item lavfi.rect.x +x position of object + +@item lavfi.rect.y +y position of object +@end table It accepts the following options: @@ -13777,7 +13799,12 @@ It accepts the following options: Filepath of the object image, needs to be in gray8. @item threshold -Detection threshold, default is 0.5. +Detection threshold, expressed as a decimal number in the range 0-1. + +A threshold value of 0.01 means only exact matches, a threshold of 0.99 means +almost everything matches. + +Default value is 0.5. @item mipmaps Number of mipmaps, default is 3. @@ -13797,6 +13824,16 @@ Cover a rectangular object by the supplied image of a given video using @command @example ffmpeg -i file.ts -vf find_rect=newref.pgm,cover_rect=cover.jpg:mode=cover new.mkv @end example + +@item +Find the position of an object in each frame using @command{ffprobe} and write +it to a log file: +@example +ffprobe -f lavfi movie=test.mp4,find_rect=object=object.pgm:threshold=0.3 \ + -show_entries frame=pkt_pts_time:frame_tags=lavfi.rect.x,lavfi.rect.y \ + -of csv -o find_rect.csv +@end example + @end itemize @section floodfill