From mboxrd@z Thu Jan  1 00:00:00 1970
From: ludo@gnu.org (Ludovic =?utf-8?Q?Court=C3=A8s?=)
Subject: Re: libvdpau: cannot open shared object
Date: Fri, 15 Dec 2017 12:02:14 +0100
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To: Efraim Flashner <efraim@flashner.co.il>
Cc: help-guix@gnu.org

Efraim Flashner <efraim@flashner.co.il> skribis:

> On Thu, Dec 14, 2017 at 10:07:20AM +0100, Ludovic Court=C3=A8s wrote:

[...]

>> > From da659401a0116d0810f003769c933253f5b18f4c Mon Sep 17 00:00:00 2001
>> > From: Efraim Flashner <efraim@flashner.co.il>
>> > Date: Tue, 12 Dec 2017 21:44:49 +0200
>> > Subject: [PATCH] gnu: Add libvdpau-va-gl.
>> >
>> > * gnu/packages/video.scm (libvdpau-va-gl): New variable.
>> > * gnu/packages/patches/libvdpau-va-gl-unbundle.patch: New file.
>> > * gnu/local.mk (dist_patch_DATA): Register it.
>>=20
>> [...]
>>=20
>> > +    (native-inputs
>> > +     `(("libvdpau" ,libvdpau)
>>=20
>> Should move to =E2=80=98inputs=E2=80=99 I guess?
>>=20
>> Otherwise LGTM, thanks for acting this fast!
>
> $ guix gc --references $(guix build libvdpau-va-gl)
> /gnu/store/1zfmi6bixxz3fljr4kfy37xpjial90p1-libva-1.8.3
> /gnu/store/3h31zsqxjjg52da5gp3qmhkh4x8klhah-glibc-2.25
> /gnu/store/6wyjls0q2c9gjskkplsr1ad09p3d8gzg-gcc-5.4.0-lib
> /gnu/store/7mdyg1vigcxqb1ra16mdqnhz8aa00xc7-libxext-1.3.3
> /gnu/store/8z7130mb33a3jqliqs6bq2d46mar5gqy-mesa-17.2.1
> /gnu/store/d3pbj6vynkig0v0lnwp9nh04sijxin2w-libvdpau-va-gl-0.4.2
> /gnu/store/p37m873k9k69m944njar80i6bsmqrcvj-libx11-1.6.5
>
> libvdpau is actually a propagated input of mesa

OK.

>> When we have that, we can at least arrange for things to work
>> out-of-the-box on GuixSD.  It=E2=80=99s better if we can do that without=
 setting
>> LD_LIBRARY_PATH, we=E2=80=99ll have to investigate how this can be done.=
  At
>> least, we=E2=80=99ll have to set VDPAU_DRIVER=3Dva_gl I presume?
>>=20
>> Thanks,
>> Ludo=E2=80=99.
>
> From the upstream documentation VDPAU_DRIVER=3Dva_gl is the minimum needed
> to get it working, and then there are a couple of other environmental
> variables that can be set to change its behavior.
>
> $ VDPAU_DRIVER=3Dva_gl LD_LIBRARY_PRELOAD=3D$(guix build libvdpau-va-gl) =
env | grep VDPAU
> VDPAU_DRIVER=3Dva_gl
>
> $ VDPAU_DRIVER=3Dva_gl LD_LIBRARY_PRELOAD=3D$(guix build libvdpau-va-gl) =
vdpauinfo
> display: :0.0   screen: 0
> Failed to open VDPAU backend libvdpau_va_gl.so: cannot open shared object=
 file: No such file or directory
> Error creating VDPAU device: 1

It should be:

  LD_LIBRARY_PATH=3D$(guix build libvdpau-va-gl)/lib

or:

  LD_PRELOAD=3D$(guix build libvdpau-va-gl)/lib/libwhatever-its-called.so

HTH!

Ludo=E2=80=99.