oggdemux: ignore header pages when looking for keyframe

This was causing keyframe_granule to be set to 0 for all streams
when seeking to the beginning of the stream, i.e., at the
beginning of playback.  Fixes #619778.

diff --git a/ext/ogg/gstoggdemux.c b/ext/ogg/gstoggdemux.c
index 18ecc55..76d179e 100644 (file)
--- a/ext/ogg/gstoggdemux.c
+++ b/ext/ogg/gstoggdemux.c
@@ -2113,7 +2113,7 @@ gst_ogg_demux_do_seek (GstOggDemux * ogg, GstSegment * segment,
       goto next;
 
     granulepos = ogg_page_granulepos (&og);
-    if (granulepos == -1) {
+    if (granulepos == -1 || granulepos == 0) {
       GST_LOG_OBJECT (ogg, "granulepos of next page is -1");
       continue;
     }