command: add vf-metadata property

This is a read-only property that uses VFCTRL_GET_METADATA
to retrieve mp_tags metadata from a filter specified by label

Signed-off-by: wm4 <wm4@nowhere>

1 files changed, 12 insertions, 1 deletions

diff --git a/DOCS/man/en/input.rst b/DOCS/man/en/input.rst
index f6a0f04833..d6e3affcad 100644
--- a/DOCS/man/en/input.rst
+++ b/DOCS/man/en/input.rst
@@ -731,7 +731,7 @@ Property list
             (key and string value for each metdata entry)
 
 ``chapter-metadata``
-    Metadata of current chapter. Works similar to ``metadata`` property. IT
+    Metadata of current chapter. Works similar to ``metadata`` property. It
     also allows the same access methods (using sub-properties).
 
     Per-chapter metadata is very rare. Usually, only the chapter name
@@ -740,6 +740,17 @@ Property list
     For accessing other information, like chapter start, see the
     ``chapter-list`` property.
 
+``vf-metadata/<filter-label>``
+    Metadata added by video filters. Accessed by the filter label,
+    which if not explicitly specified using the ``@filter-label:`` syntax,
+    will be ``<filter-name>NN``.
+
+    Works similar to ``metadata`` property. It allows the same access
+    methods (using sub-properties).
+
+    An example of these kind of metadata are the cropping parameters
+    added by ``--vf=lavfi=cropdetect``.
+
 ``pause`` (RW)
     Pause status. This is usually ``yes`` or ``no``. See ``--pause``.