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

[GStreamer (GNOME Bugzilla)]

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

--- Comment #1 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
(In reply to Daniel van Vugt from comment #0)
> 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

this is negotiated to GLUploadTexture by default

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

this is negotiated with dmabuf by default


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

this is negotiated with normal memcopy

> 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

Another exercise: compare with clutterautovideosink, which also uses
GLUploadMeta (either in GLX or EGL)

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

In my setup it goes smooth.

Also compare with glimagesink forcing the memcopy:

env GST_GL_PLATFORM=glx gst-launch-1.0 filesrc location=
~/Downloads/bbb_sunflower_2160p_60fps_normal.mp4 ! qtdemux ! vaapidecodebin !
video/x-raw ! glimagesink

In my setup a lot of frames are dropped too.

IIUC, we should optimize when linking vaapi decoder and glimagesink

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