--- /dev/null
+option "duration" d
+#~~~~~~~~~~~~~~~~~~
+"prebuffer time"
+int typestr="milliseconds"
+default="200"
+optional
+details="
+ Wait that many milliseconds before letting data go through.
+ The time interval starts when the first data byte is seen by
+ this filter.
+"
+
+option "size" s
+#~~~~~~~~~~~~~~
+"amount of data to prebuffer"
+int typestr="bytes"
+default="0"
+optional
+details="
+ Wait until that many data bytes are available in the input buffer.
+ The default value of zero means to not prebuffer by size at all.
+ If both --duration and --size options are given and non-zero, the
+ filter waits until both conditions are met.
+"