[X2Go-User] X-Video extension missing

[Ulrich Sibiller]

On Thu, Jan 30, 2020 at 4:12 PM Ingo Brückl <ib at wupperonline.de> wrote:
> >> That's too bad, because performance is excellent even on weak systems and
> >> slow lines.
>
> > Yes, normal performance is very good. But when it comes to 3d graphics
> > or video it is not.
>
> I actually meant that even video performance is excellent.

Then you probably have a decent network, right?

> >> I've tried an other video output driver, that plays video on the client,
> >> but is extremely limited compared to XVideo.
>
> > I am not really sure what you mean by that.
>
> I told the player to use XImage/Shm instead of XVideo. Videos play fine and
> smoothly, but the XImage/Shm output driver is somewhat limited (like when
> changing from windowed playback to fullscreen).

> > Playing video on the client means playing it locally using the capabilities
> > of the local graphics hardware.
>
> The client hardware should be fine.
>
> As far as I understand, the VcXsrv's display just don't answers X11's Xv
> requests. It reports XvQueryExtension() okay, but XvQueryAdaptors() returns
> 0 adapters, which means that either the call is "blocked" or VcXsrv has no
> (full?) XVideo support.

Yes, I'd expect that. You can try if xming or mobaxterm or nxwin or
any other X server for windows offer X-Video support. But I doubt it
as - to my understanding - this is something the graphics driver (the
Intel driver) must provide. But the Intel driver for windows probably
never will provide what an X server requies. However, even then nx
still would not be able to support it.

> > We _could_ pass on X-Video requests to the X-Video extension on the
> > client side. But I doubt that would bring significant improvements
> > because the data would still  have to travel the wire back and forth.
>
> It's not about performance, but presumably about capabilities.
> VcXsrv with (hopefully) build-in XVideo support should do the rest.
>
> Since I always compile everything for the X2Go server by myself, I'd be
> happy to test if XVideo passing could easily be added and if you could
> provide either XVideo passing sources or a patch to me.

No, sorry, I have nothing available and I consider this not a real
problem. You can still use the x11 or the gl output for mplayer.

Uli