From: softworkz <softwo...@hotmail.com>
Exmaple command: ffmpeg -h filters=overlay
Output:
Filter overlay
Overlay a video source on top of the input.
slice threading supported
Inputs:
#0: main (video), Formats: Dynamic, Default: [yuv420p, yuvj420p,
yuva420p, nv12, nv21]
#1: overlay (video), Formats: Dynamic, Default: [yuva420p]
Outputs:
#0: default (video), Formats: Dynamic, Default: [yuv420p, yuvj420p,
yuva420p, nv12, nv21]
overlay AVOptions:
[...]
Signed-off-by: softworkz <softwo...@hotmail.com>
---
fftools/opt_common.c | 37 ++++++++++++++++++++++++++-----------
1 file changed, 26 insertions(+), 11 deletions(-)
diff --git a/fftools/opt_common.c b/fftools/opt_common.c
index 8a06df82df..774e3c776b 100644
--- a/fftools/opt_common.c
+++ b/fftools/opt_common.c
@@ -504,6 +504,7 @@ static void show_help_filter(const char *name)
{
#if CONFIG_AVFILTER
const AVFilter *f = avfilter_get_by_name(name);
+ AVBPrint bp;
int i, count;
if (!name) {
@@ -514,40 +515,54 @@ static void show_help_filter(const char *name)
return;
}
- printf("Filter %s\n", f->name);
+ av_bprint_init(&bp, 0, AV_BPRINT_SIZE_UNLIMITED);
+ av_log_set_callback(NULL);
+
+ av_bprintf(&bp, "Filter %s\n", f->name);
if (f->description)
- printf(" %s\n", f->description);
+ av_bprintf(&bp, " %s\n", f->description);
if (f->flags & AVFILTER_FLAG_SLICE_THREADS)
- printf(" slice threading supported\n");
+ av_bprintf(&bp, " slice threading supported\n");
- printf(" Inputs:\n");
+ av_bprintf(&bp, " Inputs:\n");
count = avfilter_filter_pad_count(f, 0);
for (i = 0; i < count; i++) {
- printf(" #%d: %s (%s)\n", i, avfilter_pad_get_name(f->inputs, i),
+ av_bprintf(&bp, " #%d: %s (%s), Formats: ", i,
avfilter_pad_get_name(f->inputs, i),
av_get_media_type_string(avfilter_pad_get_type(f->inputs, i)));
+
+ avfilter_print_config_formats(&bp, f, 0, i);
+ av_bprintf(&bp, "\n");
}
if (f->flags & AVFILTER_FLAG_DYNAMIC_INPUTS)
- printf(" dynamic (depending on the options)\n");
+ av_bprintf(&bp, " dynamic (depending on the options)\n");
else if (!count)
- printf(" none (source filter)\n");
+ av_bprintf(&bp, " none (source filter)\n");
- printf(" Outputs:\n");
+ av_bprintf(&bp, " Outputs:\n");
count = avfilter_filter_pad_count(f, 1);
for (i = 0; i < count; i++) {
- printf(" #%d: %s (%s)\n", i, avfilter_pad_get_name(f->outputs,
i),
+ av_bprintf(&bp, " #%d: %s (%s), Formats: ", i,
avfilter_pad_get_name(f->outputs, i),
av_get_media_type_string(avfilter_pad_get_type(f->outputs, i)));
+
+ avfilter_print_config_formats(&bp, f, 1, i);
+ av_bprintf(&bp, "\n");
}
if (f->flags & AVFILTER_FLAG_DYNAMIC_OUTPUTS)
- printf(" dynamic (depending on the options)\n");
+ av_bprintf(&bp, " dynamic (depending on the options)\n");
else if (!count)
- printf(" none (sink filter)\n");
+ av_bprintf(&bp, " none (sink filter)\n");
+
+ av_log_set_callback(log_callback_help);
+ printf("%s\n", bp.str);
if (f->priv_class)
show_help_children(f->priv_class, AV_OPT_FLAG_VIDEO_PARAM |
AV_OPT_FLAG_FILTERING_PARAM |
AV_OPT_FLAG_AUDIO_PARAM);
if (f->flags & AVFILTER_FLAG_SUPPORT_TIMELINE)
printf("This filter has support for timeline through the 'enable'
option.\n");
+
+ av_bprint_finalize(&bp, NULL);
#else
av_log(NULL, AV_LOG_ERROR, "Build without libavfilter; "
"can not to satisfy request\n");
--
ffmpeg-codebot
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