Index: DOCS/tech/slave.txt
===================================================================
--- DOCS/tech/slave.txt	(revision 32105)
+++ DOCS/tech/slave.txt	(working copy)
@@ -513,6 +513,7 @@
 length             time                      X            length of file in seconds
 percent_pos        int       0       100     X   X   X    position in percent
 time_pos           time      0               X   X   X    position in seconds
+start_time         time                      X            file start time in seconds
 metadata           str list                  X            list of metadata key/value
 metadata/*         string                    X            metadata values
 volume             float     0       100     X   X   X    change volume
Index: command.c
===================================================================
--- command.c	(revision 32105)
+++ command.c	(working copy)
@@ -445,6 +445,13 @@
                                                 mpctx->audio_out));
 }
 
+/// Stream start time in seconds (RO)
+static int mp_property_stream_start_time(m_option_t *prop, int action,
+                                       void *arg, MPContext *mpctx)
+{
+    return m_property_double_ro(prop, action, arg, start_pts);
+}
+
 /// Current chapter (RW)
 static int mp_property_chapter(m_option_t *prop, int action, void *arg,
                                MPContext *mpctx)
@@ -2088,6 +2095,8 @@
      M_OPT_RANGE, 0, 100, NULL },
     { "time_pos", mp_property_time_pos, CONF_TYPE_TIME,
      M_OPT_MIN, 0, 0, NULL },
+    { "start_time", mp_property_stream_start_time, CONF_TYPE_DOUBLE,
+     M_OPT_MIN, 0, 0, NULL },
     { "chapter", mp_property_chapter, CONF_TYPE_INT,
      M_OPT_MIN, 0, 0, NULL },
     { "chapters", mp_property_chapters, CONF_TYPE_INT,