dynamically replacing elements in a playing gstreamer pipeline

[Vijay Vikram]

Hey Mark,
Try this.
http://cgit.freedesktop.org/gstreamer/gstreamer/tree/docs/design/part-block.txt
Hope it works for you.

Regards,
Vikram
On Fri, Aug 24, 2012 at 11:15 PM, markymark <mark.rollins at yahoo.com> wrote:

> 0 down vote favorite
>
>
> I'm looking for the correct technique, if one exists, for dynamically
> replacing an element in a running gstreamer pipeline. I have a gstreamer
> based c++ app and the pipeline it creates looks like this (using gst-launch
> syntax) :
>
> souphttpsrc location="http://localhost/local.ts" ! mpegtsdemux name=d !
> queue ! mpeg2dec ! xvimagesink d. ! queue ! a52dec ! pulsesink
>
> During the middle of playback (i.e. GST_STATE_PLAYING is the pipeline state
> and the user is happily watching video), I need to remove souphttpsrc from
> the pipeline and create a new souphttpsrc, or even a new neonhttpsource,
> and
> then immediately add that back into the pipeline and continue playback of
> the same uri source stream at the same time position where playback was
> before we performed this operation. The user might see a small delay and
> that is fine.
>
> We've barely figured out how to remove and replace the source, and we need
> more understanding. Here's our best attempt thus far:
>
> gst_element_unlink(source, demuxer);
> gst_element_set_state(source, GST_STATE_NULL);
> gst_bin_remove(GST_BIN(pipeline), source);
> source = gst_element_factory_make("souphttpsrc", "src");
> g_object_set(G_OBJECT(source), "location", url, NULL);
> gst_bin_add(GST_BIN(pipeline), source);
> gst_element_link(source, demuxer);
> gst_element_sync_state_with_parent(source);
>
> This doesn't work perfectly because the source is playing back from the
> beginning and the rest of the pipeline is waiting for the correct
> timestamped buffers (I assume) because after several seconds, playback
> picks
> back up. I tried seeking the source in multiple ways but nothing has
> worked.
>
> I need to know the correct way to do this. It would be nice to know a
> general technique, if one exists, as well, in case we wanted to dynamically
> replace the decoder or some other element.
>
> thanks
>
>
>
> --
> View this message in context:
> http://gstreamer-devel.966125.n4.nabble.com/dynamically-replacing-elements-in-a-playing-gstreamer-pipeline-tp4656068.html
> Sent from the GStreamer-devel mailing list archive at Nabble.com.
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