+#if CONFIG_AVFILTER
+static void show_help_filter(const char *name)
+{
+ const AVFilter *f = avfilter_get_by_name(name);
+ int i, count;
+
+ if (!name) {
+ av_log(NULL, AV_LOG_ERROR, "No filter name specified.\n");
+ return;
+ } else if (!f) {
+ av_log(NULL, AV_LOG_ERROR, "Unknown filter '%s'.\n", name);
+ return;
+ }
+
+ printf("Filter %s [%s]:\n", f->name, f->description);
+
+ if (f->flags & AVFILTER_FLAG_SLICE_THREADS)
+ printf(" slice threading supported\n");
+
+ printf(" Inputs:\n");
+ count = avfilter_pad_count(f->inputs);
+ for (i = 0; i < count; i++) {
+ printf(" %d %s (%s)\n", i, avfilter_pad_get_name(f->inputs, i),
+ media_type_string(avfilter_pad_get_type(f->inputs, i)));
+ }
+ if (f->flags & AVFILTER_FLAG_DYNAMIC_INPUTS)
+ printf(" dynamic (depending on the options)\n");
+
+ printf(" Outputs:\n");
+ count = avfilter_pad_count(f->outputs);
+ for (i = 0; i < count; i++) {
+ printf(" %d %s (%s)\n", i, avfilter_pad_get_name(f->outputs, i),
+ media_type_string(avfilter_pad_get_type(f->outputs, i)));
+ }
+ if (f->flags & AVFILTER_FLAG_DYNAMIC_OUTPUTS)
+ printf(" dynamic (depending on the options)\n");
+
+ if (f->priv_class)
+ show_help_children(f->priv_class, AV_OPT_FLAG_VIDEO_PARAM |
+ AV_OPT_FLAG_AUDIO_PARAM);
+}
+#endif
+