FFmpeg
|
Potential thumbnail lookup filter to reduce the risk of an inappropriate selection (such as a black frame) we could get with an absolute seek. More...
Go to the source code of this file.
Data Structures | |
struct | thumb_frame |
struct | ThumbContext |
Macros | |
#define | HIST_SIZE (3*256) |
#define | OFFSET(x) offsetof(ThumbContext, x) |
#define | FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
Functions | |
AVFILTER_DEFINE_CLASS (thumbnail) | |
static av_cold int | init (AVFilterContext *ctx) |
static double | frame_sum_square_err (const int *hist, const double *median) |
Compute Sum-square deviation to estimate "closeness". | |
static AVFrame * | get_best_frame (AVFilterContext *ctx) |
static int | filter_frame (AVFilterLink *inlink, AVFrame *frame) |
static av_cold void | uninit (AVFilterContext *ctx) |
static int | request_frame (AVFilterLink *link) |
static int | config_props (AVFilterLink *inlink) |
static int | query_formats (AVFilterContext *ctx) |
Variables | |
static const AVOption | thumbnail_options [] |
static const AVFilterPad | thumbnail_inputs [] |
static const AVFilterPad | thumbnail_outputs [] |
AVFilter | avfilter_vf_thumbnail |
Potential thumbnail lookup filter to reduce the risk of an inappropriate selection (such as a black frame) we could get with an absolute seek.
Simplified version of algorithm by Vadim Zaliva lord@. croc odile .org
Definition in file vf_thumbnail.c.
#define HIST_SIZE (3*256) |
Definition at line 34 of file vf_thumbnail.c.
Referenced by frame_sum_square_err(), and get_best_frame().
#define OFFSET | ( | x | ) | offsetof(ThumbContext, x) |
Definition at line 49 of file vf_thumbnail.c.
#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
Definition at line 50 of file vf_thumbnail.c.
AVFILTER_DEFINE_CLASS | ( | thumbnail | ) |
|
static |
Definition at line 59 of file vf_thumbnail.c.
|
static |
Compute Sum-square deviation to estimate "closeness".
hist | color distribution histogram |
median | average color distribution histogram |
Definition at line 79 of file vf_thumbnail.c.
Referenced by get_best_frame().
|
static |
Definition at line 91 of file vf_thumbnail.c.
Referenced by filter_frame(), and request_frame().
|
static |
Definition at line 131 of file vf_thumbnail.c.
|
static |
Definition at line 161 of file vf_thumbnail.c.
|
static |
Definition at line 170 of file vf_thumbnail.c.
|
static |
Definition at line 191 of file vf_thumbnail.c.
|
static |
Definition at line 200 of file vf_thumbnail.c.
|
static |
Definition at line 52 of file vf_thumbnail.c.
|
static |
Definition at line 210 of file vf_thumbnail.c.
|
static |
Definition at line 221 of file vf_thumbnail.c.
AVFilter avfilter_vf_thumbnail |
Definition at line 230 of file vf_thumbnail.c.