[Bug 721220] ximagesrc returns black screen
GStreamer (bugzilla.gnome.org)
bugzilla at gnome.org
Thu Jan 9 09:25:54 PST 2014
https://bugzilla.gnome.org/show_bug.cgi?id=721220
GStreamer | gst-plugins-good | 1.2.1
Vincent Penquerc'h <vincent.penquerch> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEEDINFO |NEW
CC| |vincent.penquerch at collabora
| |.co.uk
Ever Confirmed|0 |1
--- Comment #4 from Vincent Penquerc'h <vincent.penquerch at collabora.co.uk> 2014-01-09 17:25:50 UTC ---
With: gst-launch-1.0 ximagesrc ! video/x-raw,framerate=5/1 ! queue !
videoconvert ! autovideosink sync=false
It work on Ubuntu 12.04, but gives black on Fedora 18 (on which I do not have a
gst tree handy atm). Adding remote=1 makes it work on Fedora.
On the Fedora side, I see warnings:
Could not initialise Xv output
Looking at the code from there, it turns out the gst I get on Fedora is
apparently built without SHM, so we go into the XGetimage/XGetSubImage path
(strings -a on the plugin does not show the "Retrieving screen using XShm"
being compiled in).
So it'd seem like a bug (unless argued otherwise) in the builing setup for the
gst Fedora packages. This Fedora is a VM with no dev/gst setup so I can't
easily build gst there to double check it works when using shm, but it seems
likely.
remote=1 provides a workaround (though may have performance implications)
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