[Bug 766954] General stream error or black screen on Wayland

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=766954

--- Comment #16 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
(In reply to Egor Zaharov from comment #15)
> 
> > Yes, it is bad. That is why, in master, we already landed a patch which
> > bails out the gstreamer-vaapi elements when the driver is not in a
> > "white-list", and only the intel and gallium drivers are in that list (bug
> > 764673).
> 
> And if driver is in white list, and fails to play video, Gstreamer will not
> try to fall back to software decoding? Maybe I just misunderstood you (damn
> language barrier), that is not what I meant.

If the play fails in a white-listed drive then it is a bug that need to be
addressed either in gstreamer-vaapi or the driver.

We did the white-list because there are unmantained drivers. But it is not you
case, the problem is to fix something in the gallium driver when Wayland is
used.

> I think gstreamer-vaapi can't be installed by default in distribution, only
> because if it fails, then this is fatal. E.g. if this kind of hardware does
> not have video decoding capatibilities, or just fails because of the driver,
> then it can't play the video at all. But it should not be like that.

Right now, with vaapidecode, if a codec is not supported by the hardware, the
element bails and decobebin will try another decoder.

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