[Bug 770535] Playbin fails to decode stream when gst-vaapi is installed

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=770535

--- Comment #9 from Hyunjun Ko <zzoon at igalia.com> ---
(In reply to Víctor Manuel Jáquez Leal from comment #8)
> The only solution I see to this is to expose the supported profiles when
> registering the decoders.

I don't think it's possible to work. Even if we expose supported profiles to
caps, h264parse would not care during negotiation at first.

I think this is about only byte-stream/nal. 
If we support only au alignment, this will work fine.
I know that's not an option, just for example :)
In this case, h264parse updates src caps at preroll time, then decodebin can
reject vaapidecoder and replace with another decoder.

IMHO, this issue looks h264parse's issue.

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