matroskademux: QoS handling logic only applies to forward playback

Fixes #628894.

diff --git a/gst/matroska/matroska-demux.c b/gst/matroska/matroska-demux.c
index ed21483..1ba5750 100644 (file)
--- a/gst/matroska/matroska-demux.c
+++ b/gst/matroska/matroska-demux.c
@@ -4995,7 +4995,7 @@ gst_matroska_demux_parse_blockgroup_or_simpleblock (GstMatroskaDemux * demux,
          will instad skip until the next keyframe. */
       if (GST_CLOCK_TIME_IS_VALID (lace_time) &&
           stream->type == GST_MATROSKA_TRACK_TYPE_VIDEO &&
-          stream->index_table) {
+          stream->index_table && demux->segment.rate > 0.0) {
         GstMatroskaTrackVideoContext *videocontext =
             (GstMatroskaTrackVideoContext *) stream;
         GstClockTime earliest_time;