[gst-devel] Change pipeline's state to playing, null, playing

[Dan Taylor]

Juraj Kubelka wrote:
> Hi!
>
> I tried to change pipeline's state to PLAYING, then to NULL and then 
> to PLAYING. But the last state change is never happened. It waits 
> forever (because of blocked method pipeline.get_state()). I found out 
> message which says: filesink is changing state asynchronously to PLAYING.
>
> 0:00:04.310890050  5634 0x132efd0 INFO            GST_STATES 
> gstbin.c:2197:gst_bin_change_state_func:<pipeline> child 'file' is 
> changing state asynchronously to PLAYING
>
> But I don't know why. I would like to reuse the same pipeline. For 
> know: create it, play, stop, play, stop...  Pipeline is simple: 
> alsasrc ! queue ! audioconvert ! vorbisenc ! oggmux ! filesink.
>
> It also says:
>
> 0:00:04.393084573  5634 0x160abe0 WARN                oggmux 
> gstoggmux.c:1132:gst_ogg_mux_process_best_pad:<multiplexer> no 
> subsequent buffer and EOS not reached
> 0:00:04.393095274  5634 0x160abe0 WARN             vorbisenc 
> vorbisenc.c:1196:gst_vorbis_enc_chain:<encoder> Failed to push headers
> 0:00:04.422744230  5634 0x15de340 INFO               basesrc 
> gstbasesrc.c:2114:gst_base_src_loop:<source> pausing after 
> gst_pad_push() = wrong-state
>
> maybe because of a message above when state was changing from PLAYING 
> to NULL:
>
> 0:00:02.272544776  5634 0x1625690 INFO               basesrc 
> gstbasesrc.c:2021:gst_base_src_loop:<source> pausing after 
> gst_base_src_get_range() = wrong-state
> 0:00:02.272570930  5634 0x132efd0 INFO             GST_EVENT 
> gstpad.c:4317:gst_pad_send_event:<queue:sink> Received event on 
> flushing pad. Discarding
>
>
> Can you give me an advice?
> Thank you a lot!
> Jura

Apparently, when a pipeline is set to NULL, all of the elements are 
released (recursively) so the pointers to them are no longer valid.

Are you changing elements in the pipeline so that you go to NULL, rather 
than READY, or are you just changing element properties?
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