GStreamer and Linux, screen recording works well on Xorg but not on Wayland.

[Nicolas Dufresne]

Hi Davide,

Le mardi 11 juillet 2023 à 23:45 +0200, Davide Perini via gstreamer-devel a
écrit :
> Hi all,
> I'm trying to use GStreamer on Wayland and it seems to have some problems...
> 
> This pipeline:
> gst-launch-1.0 ximagesrc startx=1 endx=3839 starty=0 endy=2159 ! video/x-
> raw,framerate=30/1 ! videoscale method=0 ! ximagesink
> 
> works well on Xorg, but not on Wayland.

ximagesrc will have very little use anyway on Wayland, as wayland have built-in
privacy security. Please consider using the appropriate portal and pipewire
streams for this purpose. The following link is an example on how to do this in
your own application.

https://gitlab.gnome.org/-/snippets/19

Nicolas

> 
> On wayland I have this error:
> Setting pipeline to PAUSED ...
> Pipeline is live and does not need PREROLL ...
> Pipeline is PREROLLED ...
> Setting pipeline to PLAYING ...
> New clock: GstSystemClock
> Redistribute latency...
> WARNING: from element /GstPipeline:pipeline0/GstXImageSink:ximagesink0:
> Pipeline construction is invalid, please add queues.
> Additional debug info:
> ../gstreamer/subprojects/gstreamer/libs/gst/base/gstbasesink.c(1249):
> gst_base_sink_query_latency ():
> /GstPipeline:pipeline0/GstXImageSink:ximagesink0:
> Not enough buffering available for the processing deadline of
> 0:00:00.015000000, add enough queues to buffer 0:00:00.015000000 additional
> data. Shortening processing latency to 0:00:00.000000000.
> WARNING: from element /GstPipeline:pipeline0/GstXImageSink:ximagesink0:
> Pipeline construction is invalid, please add queues.
> Additional debug info:
> ../gstreamer/subprojects/gstreamer/libs/gst/base/gstbasesink.c(1249):
> gst_base_sink_query_latency ():
> /GstPipeline:pipeline0/GstXImageSink:ximagesink0:
> Not enough buffering available for the processing deadline of
> 0:00:00.015000000, add enough queues to buffer 0:00:00.015000000 additional
> data. Shortening processing latency to 0:00:00.000000000.
> X Error of failed request: BadMatch (invalid parameter attributes)
> Major opcode of failed request: 73 (X_GetImage)
> Serial number of failed request: 52
> Current serial number in output stream: 52
> 
> Is there any fix for this since Xorg is going to be deprecated everywhere? :)
> 
> Thanks
> Davide

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