From 0b55b16abc15c3fad0ae8b7cedc8f63f1162e89c Mon Sep 17 00:00:00 2001
From: Vladimir Pantelic <vladoman@gmail.com>
Date: Wed, 23 Jan 2013 13:54:08 +0100
Subject: avfilter: allow setpts filter to use wallclock time for calculations

Signed-off-by: Vladimir Pantelic <vladoman@gmail.com>
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
---
 doc/filters.texi | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'doc')

diff --git a/doc/filters.texi b/doc/filters.texi
index 34db2f4..2bd013d 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -1864,6 +1864,12 @@ previous input PTS
 @item PREV_OUTPTS
 previous output PTS
 
+@item RTCTIME
+wallclock (RTC) time in microseconds
+
+@item RTCSTART
+wallclock (RTC) time at the start of the movie in microseconds
+
 @end table
 
 Some examples follow:
@@ -1883,6 +1889,9 @@ setpts=N/(25*TB)
 
 # fixed rate 25 fps with some jitter
 setpts='1/(25*TB) * (N + 0.05 * sin(N*2*PI/25))'
+
+# generate timestamps from a "live source" and rebase onto the current timebase
+setpts='(RTCTIME - RTCSTART) / (TB * 1000000)"
 @end example
 
 @anchor{setsar}
-- 
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