seek stop problem

[Stefan Sauer]

On 03/21/2012 10:03 PM, Sergei Vorobyov wrote:
> Indeed, I just complemented
>
> GST_SEEK_FLAG_FLUSH,
>
> below with the segment flag
>
> GST_SEEK_FLAG_FLUSH | GST_SEEK_FLAG_SEGMENT,
>
> and now
>
>  if (msg_type & GST_MESSAGE_SEGMENT_DONE) {
>       g_print ("SEGMENT DONE message\n");
>       g_main_loop_quit (loop);
>       return TRUE;
> }
>
> in my callback stops the stream after 5 seconds, as intended.
>
> Many thanks, Stefan!
>
> I just wanted to repeat my question: is it better to:
>
> 1) call g_main_loop_quit (loop) in the callback and iterate for(;;) {
> ... g_main_loop_run (loop); ...} or
>
> 2) making the seek inside the callback, never calling g_main_loop_quit
> (loop) and (top-level) calling g_main_loop_run (loop) just once?
>
> I mean, what is the canonical/preferred way?

It is completely fine to just seek from the segment-done callback. No
need to stop the main-loop.

> I noticed that using alternative 1) when I leave my random player work
> overnight, it does not leak memory (about 2.5% of 3GB), but the
> computer becomes *completely* irresponsive (it takes about a minute to
> echo every keystroke) and I have to reboot. (Of course, this may be
> caused by my own other remaining errors).
No idea about that. Maybe you can investigate a bit further. Also
consider publishing it somewhere so that people can retry that fro themself.

Stefan

> Best regards,
> Sergei
>
> On Wed, Mar 21, 2012 at 9:15 PM, Stefan Sauer <ensonic at hora-obscura.de> wrote:
>> 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!
>>> _______________________________________________
>>> gstreamer-devel mailing list
>>> gstreamer-devel at lists.freedesktop.org
>>> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel
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