[gst-devel] how to restart a pipeline

[Arnout Vandecappelle]

On Thursday 09 October 2008 05:14:07 you wrote:
> Hi Pavel ,
> You can Unlink the elements ,then set state of pipeline as NULL ,then set
> next file to play using the same pipeline,then Link the elements and set
> state as PLAY.

 However, before unlinking the elements, you should send an EOS through them, 
otherwise the stream will not close properly.  For most pipelines this 
probably doesn't matter, but for instance the matroskamux sets the duration 
when it receives EOS.

 Here's an example (prev_elt is the last element you want to keep, sink is the 
element you want to remove/replace; if you have several, all of them should 
be removed from the pipeline):

gst_pad_push_event(gst_element_get_pad(prev_elt, "src"), gst_event_new_eos());
gst_element_unlink (prev_elt, sink);
gst_element_set_state (sink, GST_STATE_NULL);
gst_bin_remove(pipeline, sink);

gst_bin_add(pipeline, new_sink);
gst_element_link(prev_elt, new_sink);
gst_element_set_state(pipeline, GST_STATE_PLAYING);


 This example assumes you don't need to preroll on your new elements...  You 
mileage may vary.

 Regards,
 Arnout

-- 
Arnout Vandecappelle                               arnout at mind be
Senior Embedded Software Architect                 +32-16-286540
Essensium/Mind                                     http://www.mind.be
G.Geenslaan 9, 3001 Leuven, Belgium                BE 872 984 063 RPR Leuven
LinkedIn profile: http://www.linkedin.com/in/arnoutvandecappelle
GPG fingerprint:  D206 D44B 5155 DF98 550D  3F2A 2213 88AA A1C7 C933