[Bug 790752] msdk: supports bufferpool

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=790752

--- Comment #100 from sreerenj <bsreerenj at gmail.com> ---
(In reply to Hyunjun Ko from comment #97)
> (In reply to sreerenj from comment #94)
> > Review of attachment 368120 [details] [review] [review]:
> > 
> > Would it be better to use videomemory always(default)?
> > According to msdk spec,system-mem is only preferred if software decoder is
> > in use.
> 
> Um.. I was thinking so but copying from vaDeriveImage to other user space is
> sometimes very slow.
> 
> For example, in this pipeline msdkh264dec ! videoconvert ! xvimagesink,
> if the decoder use video memory, playing is very slow probably on skylake.
> 
> I already sent this thing with some links to be referenced.
> 
> How about doing that (video memory by default in decoder) after we finish
> the task for handling dmabuf?

Yup, I am fine with that.
We can do the benchmarking and take a decision based on that.

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