seek stop problem

[Stefan Sauer]

On 03/21/2012 02:29 PM, Sergei Vorobyov wrote:
> Greetings,
>
> I am experiencing the following problem with stopping the playback in:
>
> for (;;) {
>
> /* random position ps in nanoseconds (out of 10 possibilities 0,
> 5000000000, 10000000000, ..., 45000000000) is generated */
>
> event = gst_event_new_seek (1.0,
> 				  GST_FORMAT_TIME,
> 				  GST_SEEK_FLAG_FLUSH,
> 				  GST_SEEK_TYPE_SET, ps,
> 				  GST_SEEK_TYPE_SET, ps + 5 * GST_SECOND);
>
> result = gst_element_send_event(pipeline, event);
>
> /* see the insert below */
>
> g_main_loop_run (loop);
>
> }
>
> My intention is to play a random 5-sec segment.
>
> The seek to the initial position ps is accurate, but the playback does
> not stop after 5 secs as intended (and specified in the APIs); it goes
> to the very end, until EOS is generated, caught in my callback
> function, which calls
>
> if (msg_type & GST_MESSAGE_EOS) {
>       g_print ("EOS message\n");
>       g_main_loop_quit (loop);
>       return TRUE;
> }
>
I don't think demuxer actually implement that. You could set the SEGMENT
flag and listen to SEGMENT_DONE next to EOS.

Stefan

> I checked and caught all signals in my callback function, and
> SEGMENT_DONE or anything relevant never occur, except EOS in the very
> end.
>
> I tried another possibility. Rather than relying on (non-working)
> terminating ... GST_SEEK_TYPE_SET, ps + 5 * GST_SECOND); above
>
> I inserted, before g_main_loop_run (loop); instead /* see the insert below */
>
> the following timeout call
>
> g_timeout_add_seconds (5, (GSourceFunc) cb_end_stream, pipeline);
>
> with the trivial callback
>
> gboolean cb_end_stream (GstElement *pipeline)
> {
>   g_main_loop_quit(loop);
>   return FALSE;
> }
>
> Now, it stops the playback accurately, always after 5 secs, but
> initial position seeks sometimes err (usually 10 secs later than
> asked).
>
> Maybe I forgot to mention that my pipeline is constructed using the
> gnlcomposition out of ten 5-second pieces concatenated in the 50 sec
> stream, which test-plays correctly and smoothly.
>
> I would appreciate any hints and help.
>
> PS:
>
> maybe I need to rewind the pipe withing the callback function, without
> ever calling g_main_loop_quit (loop) in my callbacks? Currently I am
> looping over the g_main_loop_run:
>
> for (;;) {
> ...
> g_main_loop_run (loop);
>
> }
>
> Many thanks!
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