avfilter/f_metadata: add support for file output

Signed-off-by: Tobias Rapp <t.rapp@noa-archive.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/doc/filters.texi b/doc/filters.texi
index 6c5003f207..8f4dcea111 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -8526,6 +8526,12 @@ Float representation of @code{value} from metadata key.
 @item VALUE2
 Float representation of @code{value} as supplied by user in @code{value} option.
 @end table
+
+@item file
+If specified in @code{print} mode, output is written to the named file. When
+filename equals "-" data is written to standard output.
+If @code{file} option is not set, output is written to the log with AV_LOG_INFO
+loglevel.
 @end table
 
 @subsection Examples