Useful for monitoring sparse data in realtime
---
doc/filters.texi | 3 +++
libavfilter/f_metadata.c | 6 ++++++
2 files changed, 9 insertions(+)
diff --git a/doc/filters.texi b/doc/filters.texi
index fc2d198077..e682ba62bb 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -22711,6 +22711,9 @@ plain filename any writable url can be specified.
Filename ``-'' is a shorthand
for standard output. If @code{file} option is not set, output is written to
the log
with AV_LOG_INFO loglevel.
+@item direct
+Reduces buffering in print mode when output is written to a URL set using
@var{file}.
+
@end table
@subsection Examples
diff --git a/libavfilter/f_metadata.c b/libavfilter/f_metadata.c
index 3bf4bb17f5..bf298e9d39 100644
--- a/libavfilter/f_metadata.c
+++ b/libavfilter/f_metadata.c
@@ -88,6 +88,8 @@ typedef struct MetadataContext {
int (*compare)(struct MetadataContext *s,
const char *value1, const char *value2);
void (*print)(AVFilterContext *ctx, const char *msg, ...)
av_printf_format(2, 3);
+
+ int direct; // reduces buffering when printing to user-supplied URL
} MetadataContext;
#define OFFSET(x) offsetof(MetadataContext, x)
@@ -111,6 +113,7 @@ static const AVOption filt_name##_options[] = { \
{ "ends_with", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = METADATAF_ENDS_WITH
}, 0, 0, FLAGS, "function" }, \
{ "expr", "set expression for expr function", OFFSET(expr_str),
AV_OPT_TYPE_STRING, {.str = NULL }, 0, 0, FLAGS }, \
{ "file", "set file where to print metadata information",
OFFSET(file_str), AV_OPT_TYPE_STRING, {.str=NULL}, 0, 0, FLAGS }, \
+ { "direct", "reduce buffering when printing to user-set file or pipe",
OFFSET(direct), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, FLAGS }, \
{ NULL } \
}
@@ -274,6 +277,9 @@ static av_cold int init(AVFilterContext *ctx)
s->file_str, buf);
return ret;
}
+
+ if (s->direct)
+ s->avio_context->direct = AVIO_FLAG_DIRECT;
}
return 0;
--
2.24.1
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