videomixer: add mix->segment.start to output_end_time

When the segment start is not 0, this created a situation where
the output_end_time is inferior to output_start_time, and the duration
of the next buffer ended up underflowing.

https://bugzilla.gnome.org/show_bug.cgi?id=701385

diff --git a/gst/videomixer/videomixer2.c b/gst/videomixer/videomixer2.c
index 78034b3..95e7d84 100644 (file)
--- a/gst/videomixer/videomixer2.c
+++ b/gst/videomixer/videomixer2.c
@@ -1013,7 +1013,7 @@ gst_videomixer2_collected (GstCollectPads * pads, GstVideoMixer2 * mix)
   output_end_time =
       mix->ts_offset + gst_util_uint64_scale (mix->nframes + 1,
       GST_SECOND * GST_VIDEO_INFO_FPS_D (&mix->info),
-      GST_VIDEO_INFO_FPS_N (&mix->info));
+      GST_VIDEO_INFO_FPS_N (&mix->info)) + mix->segment.start;
   if (mix->segment.stop != -1)
     output_end_time = MIN (output_end_time, mix->segment.stop);