[Bug 777115] Throws libva messages.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=777115

--- Comment #1 from Víctor Manuel Jáquez Leal <vjaquez at igalia.com> ---
Hi,

(In reply to David Herring from comment #0)
> In the context of using Beetbox/beets (a music library management system) to
> process music files using GStreamer as a back end, when beets encounters a
> .mp4 file, it causes the following messages to be issues to the command
> window, rendering any other work being done in that window impossible:
> 
> error: XDG_RUNTIME_DIR not set in the environment.

That message is unrelated to gstreamer-vaapi and libva

> libva info: VA-API version 0.39.0
> libva info: va_getDriverName() returns 0
> libva info: Trying to open /usr/lib/x86_64-linux-gnu/dri/i965_drv_video.so
> libva info: Found init function __vaDriverInit_0_39
> libva info: va_openDriver() returns 0

These messages are printed by libva (the library behind gstreamer-vaapi). The
current development version of libva (0.39.4) has API to overload the logging
mechanism, and in gstreamer-vaapi we could use to redirect the messages to
gstreamer log system. Nonetheless, if the user uses versions before 0.39.4
(which is not released yet), there are no means to avoid those messages but
modifying the libva sources.

> I've worked with the beets developers on this, and have determined through
> trial and error that this only occurs, or rather I can only recreate it,
> when beets is using GStreamer and encounters a .mp4 file. I surmise it's
> trying to use hardware acceleration to process the file and that is somehow
> causing these messages to be generated.
> 
> Is there a fix or workaround for this? Or is there a way to silence the
> messages? 

Sketching a summary of the possible options

1\ use libva 0.39.4 and patch gstreamer-vaapi to overload the va logging
options (we're going to that)
2\ patch yourself libva sources by removing those messages printf
3\ remove gstreamer-vaapi from you installation and don't use this hardware
acceleration.

> The machine running the software is an Ubuntu 16.04.1 LTS, 4.4.0-57-generic
> kernel, 64 bit, server variant (so no X windows, no desktop and no desktop
> apps loaded), fully updated from Ubuntu repositories as of 01/02/17

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