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-rw-r--r--doc/avtools-common-opts.texi3
1 files changed, 3 insertions, 0 deletions
diff --git a/doc/avtools-common-opts.texi b/doc/avtools-common-opts.texi
index 8468ecaad1..852d3f8236 100644
--- a/doc/avtools-common-opts.texi
+++ b/doc/avtools-common-opts.texi
@@ -48,6 +48,9 @@ Match the stream by stream id (e.g. PID in MPEG-TS container).
Matches streams with the metadata tag @var{key} having the specified value. If
@var{value} is not given, matches streams that contain the given tag with any
value.
+@item u
+Matches streams with usable configuration, the codec must be defined and the
+essential information such as video dimension or audio sample rate must be present.
Note that in @command{avconv}, matching by metadata will only work properly for
input files.