[Bug 795325] New: gstreamer-vaapi stutters heavily when rendering (some videos) to GLX

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=795325

            Bug ID: 795325
           Summary: gstreamer-vaapi stutters heavily when rendering (some
                    videos) to GLX
    Classification: Platform
           Product: GStreamer
           Version: unspecified
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: daniel.van.vugt at canonical.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

gstreamer-vaapi stutters heavily when rendering (some videos) to GLX.

STUTTERY:
env GST_GL_PLATFORM=glx gst-launch-1.0 filesrc
location=bbb_sunflower_2160p_60fps_normal.mp4 ! qtdemux ! vaapidecodebin !
glimagesink

SMOOTH:
env GST_GL_PLATFORM=egl gst-launch-1.0 filesrc
location=bbb_sunflower_2160p_60fps_normal.mp4 ! qtdemux ! vaapidecodebin !
glimagesink

Interestingly, GLX is even slower than software rendering (ximagesink):

STUTTERY:
env GST_GL_PLATFORM=glx gst-launch-1.0 filesrc
location=bbb_sunflower_2160p_60fps_normal.mp4 ! qtdemux ! vaapidecodebin !
glimagesink

SMOOTH:
env GST_GL_PLATFORM=glx gst-launch-1.0 filesrc
location=bbb_sunflower_2160p_60fps_normal.mp4 ! qtdemux ! vaapidecodebin !
ximagesink

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