synchronize after seek

[Bing Song]

Hi,

Below code in gstplaysink.c set appsink which used to render subtitle. Why set subtitle render async to FALSE? Sparse subtitle should send GAP to finish preroll. Is it one bug?

        /* make sure the sparse subtitles don't participate in the preroll */
        g_object_set (elem, "async", FALSE, NULL);

Regards,
Song Bing.

From: gstreamer-devel [mailto:gstreamer-devel-bounces at lists.freedesktop.org] On Behalf Of Bing Song
Sent: Friday, January 30, 2015 5:06 PM
To: Discussion of the development of and with GStreamer
Subject: RE: synchronize after seek

Hi,

Things more clear. Appsink which used to render subtitle haven't go pause state and playsink don't wait appsink's ASYNC_DONE. So subtitle rush out.

Regards,
Song Bing.

From: gstreamer-devel [mailto:gstreamer-devel-bounces at lists.freedesktop.org] On Behalf Of Bing Song
Sent: Friday, January 30, 2015 10:27 AM
To: Discussion of the development of and with GStreamer
Subject: synchronize after seek

Hi,

I met one issue: subtitle will rush out without synchronize after seek. Several sentences will rush out and then can synchronize with clock.
Our use case is below.

1.      Test with external subtitle.

2.      Render subtitle with appsink, not combine with video.

My suspect is subtitle pipeline run very fast. Several subtitles after seek can't get valid time from clock, and then rush out.
Do Gstreamer has method to wait all pipeline (audio,video,subtitle) to finish pro-roll, and then start clock? How to ensure all pipeline synchronized and then start after seek?

Regards,
Song Bing.
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