---
doc/filters.texi | 47 +++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 45 insertions(+), 2 deletions(-)
diff --git a/doc/filters.texi b/doc/filters.texi
index 0ca1d6f..44eecca 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -742,8 +742,51 @@ Pass the audio source unchanged to the output.
@section apad
-Pad the end of a audio stream with silence, this can be used together with
--shortest to extend audio streams to the same length as the video stream.
+Pad the end of an audio stream with silence.
+
+This can be used together with @command{ffmpeg} @option{-shortest} to
+extend audio streams to the same length as the video stream.
+
+A description of the accepted parameters follows.
+
+@table @option
+@item packet_size
+Set silence packet size. Default value is 4096.
+
+@item pad_len
+Set the number of samples of silence to add to the end. After the
+value is reached, the stream is terminated. This option is mutually
+exclusive with @option{whole_len}.
+
+@item whole_len
+Set the target number of sample in the audio stream. After the value
+is reached, the stream is terminated. This option is mutually
+exclusive with @option{pad_len}.
+@end table
+
+@subsection Examples
+
+@itemize
+@item
+Add 1024 samples of silence to the end of the input:
+@example
+apad=pad_len=1024
+@end example
+
+@item
+Make sure the audio output will contain at least 10000 samples, pad
+the input with silence if required:
+@example
+apad=whole_len=10000
+@end example
+
+@item
+Use @command{ffmpeg} to pad the audio input with silence, so that the
+video stream will be converted in the output until the end:
+@example
+ffmpeg -i VIDEO -i AUDIO -filter_complex "[1:0]apad" -shortest OUTPUT
+@end example
+@end itemize
@section aphaser
Add a phasing effect to the input audio.
--
1.8.3.2
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