[Bug 724814] New: Wrong color conversion when download frame

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=724814
  GStreamer | gst-plugins-gl | 1.2.4

           Summary: Wrong color conversion when download frame
    Classification: Platform
           Product: GStreamer
           Version: 1.2.4
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: Normal
         Component: gst-plugins-gl
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: adrien.schwartzentruber at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Video file sample :
http://www.auby.no/files/video_tests/h264_1080p_hp_4.1_10mbps_dts_unstyled_subs_monsters.mkv

Command : 
gst-launch-1.0 filesrc location=path ! matroskademux ! h264parse ! vaapidecode
! glcolorscale ! video/x-raw, format=RGB, width=500, height=500 ! xvimagesink

Working command : 
gst-launch-1.0 filesrc location=path ! matroskademux ! h264parse ! vaapidecode
! glcolorscale ! video/x-raw, format=I420, width=500, height=500 ! xvimagesink

Observations : 
With the wrong color conversion, you should a "red image", and with the correct
command, a frame with correct colors. The different (with my quick look) is
that in gstgldownload.c line 532, any color conversion is done, and there is
certainly something to do. 

Environment : 
Gstreamer : 1.2.3
gst-plugin-gl : 0.11.0.1
vainfo: Driver version: Intel i965 driver - 1.2.2.pre2

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