Hi All,
I am implementing a functionality in the a player. In that, I require to seek the only video to catch up with the audio in case of lateness.
This functionality is required to remove jerks and audio drop and to make the playback smoother.
For that I have added data probing to sink pad and in the handler, under Qos event I am checking the lateness.
If lateness is more than 500 ms, I need to seek video part to catch with audio.
For that, I am calling the following function from Qos event handler by using g_timeout_add(50,seek_handle,app);
static gboolean
seek_handle(gpointer data)
{
GstClockTimeDiff seekPos;
GstSeekFlags flags = GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_KEY_UNIT;
GstClockTimeDiff pos;
GstFormat format = GST_FORMAT_TIME;
gst_element_query_position (app->pipeline, &format, &pos);
seekPos = pos + GST_MSECOND * 500;
gst_element_seek (app->seekElement, 1.0, GST_FORMAT_TIME, flags,
GST_SEEK_TYPE_SET, seekPos, GST_SEEK_TYPE_NONE,GST_CLOCK_TIME_NONE );
return FALSE;
}
So I have following queries regarding this implementation.
1) In the above implementation, it seeks audio and video both.
2) Is it possible to seek only video in gstreamer. The support for that is available at parser level in my implementation.
3) In above implementation, if I use only GST_SEEK_FLAG_FLUSH then it pauses the pipeline for 5 second before seeking to new position.
4) If I use the both flags as mentioned above, then for some streams it play again and again from certain location.
The reason for that may be due to nearest KeyFrame is from previous location. So is there any way to force to get the next keyframe from forward location.
I am wondering, why are these behavior (3 and 4) observed. Am I missing something ? or is there any other way of doing it ?
Thanks
Jitendra
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