[Bug 703632] GStreamer: unable to query position of stream

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=703632
  GStreamer | gstreamer (core) | unspecified

Tim-Philipp Müller <t.i.m> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |NOTGNOME
   Target Milestone|HEAD                        |NONE

--- Comment #3 from Tim-Philipp Müller <t.i.m at zen.co.uk> 2013-11-22 09:06:08 UTC ---
> That code is in opencv.

To me this looks like it's most likely an issue in the opencv code then. That
warning is not a warning printed by GStreamer code.

> > A query like this might also fail if the pipeline is not prerolled yet. Is it
> > prerolled here?
> 
> Sorry, I don't know what's it means.

Position and duration queries will usually only work once a pipeline is
"prerolled", meaning some data has made it to the sink. It is a common error to
do e.g.:

   set_state (pipeline, PAUSED or PLAYING);
   query_{position,duration} (pipeline);

One would have to wait until the async state change is complete, by waiting for
an ASYNC_DONE message on the bus or doing a get_state() with a -1 timeout.

Let's close this for now until it's clear it's actually a bug in GStreamer. Let
me know if the opencv maintainers need help with figuring this out.

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