---
doc/filters.texi | 23 +++++++++++++++++++++++
1 file changed, 23 insertions(+)
diff --git a/doc/filters.texi b/doc/filters.texi
index 32c95b591c..2078ee0f6f 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -3659,6 +3659,29 @@ Set print format for stats. Options are summary, json,
or none.
Default value is none.
@end table
+@subsection Examples
+
+For double pass processing you need to first run the filter with
+@code{print_format} set to either @code{json} or @code{summary}, then read
+the values in the output and pass it to the next run of the filter:
+
+@example
+$ ffmpeg -i file.mov -map 0:a -af loudnorm=I=-13:TP=-1:print_format=summary -f
null -
+
+[...]
+Input Integrated: -9.0 LUFS
+Input True Peak: +1.5 dBTP
+Input LRA: 9.4 LU
+Input Threshold: -19.5 LUFS
+@end example
+
+Then pass the input measurements to the next run that produces the result:
+
+@example
+ffmpeg -i file.mov -af
loudnorm=I=-13:TP=-1:measured_I=-9.0:measured_TP=1.5:measured_LRA=9.4:measured_thresh=-19.5:print_format=summary
out.mov
+@end example
+
+
@section lowpass
Apply a low-pass filter with 3dB point frequency.
--
2.17.0 (Apple Git-106)
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