oggdemux: No need to subtract begin time

Last stop is already based on the chain start and there is no need
to subtract the chain start as it may lead to a negative overflow.
This was causing seeking issues when the target chain was not
the first one (that has chain start = 0)

Fixes #606382

diff --git a/ext/ogg/gstoggdemux.c b/ext/ogg/gstoggdemux.c
index 1540af2..cd4711c 100644 (file)
--- a/ext/ogg/gstoggdemux.c
+++ b/ext/ogg/gstoggdemux.c
@@ -2138,7 +2138,7 @@ gst_ogg_demux_perform_seek (GstOggDemux * ogg, GstEvent * event)
       stop = MIN (stop, chain->segment_stop);
     }
 
-    last_stop = ogg->segment.last_stop - begin_time;
+    last_stop = ogg->segment.last_stop;
     if (chain->segment_start != GST_CLOCK_TIME_NONE)
       last_stop += chain->segment_start;