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<blockquote type="cite">The reason we had to switch to VDPAU with
Ubuntu 16.04 is that we saw a major regression with mpeg2
playback using va-api.</blockquote>
What regression was that? The difference between VDPAU and VA-API
is only marginal for codec support.<br>
<br>
<blockquote type="cite">During our testing we put Ubuntu 19.10 on
one of these boxes and noticed that full software acceleration
has improved to the point that VA-API nor VDPAU was required for
VLC to render the mpeg2 and mpeg4 streams correctly.</blockquote>
Well how was the stack configured then? Pure software playback?<br>
<br>
As long as you don't do any high resolution H264 decoding the CPU
in that package should be capable of decoding both MPEG2 and MPEG4
with software decode.<br>
<br>
In general I would also try with mpv instead of vlc to rule out
player issues.<br>
<br>
Regards,<br>
Christian.<br>
<br>
Am 02.12.19 um 15:06 schrieb Will DeBerry:<br>
</div>
<blockquote type="cite" cite="mid:CADbdyxWVpZ-ZE3VAJA5RMVepKkvUnssXEv8BbVSX-dS3P8qR0w@mail.gmail.com">
<div dir="ltr">
<div dir="ltr">
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">well that's the very
first APU generation and unfortunately nobody is working on
that old hardware any more.<br>
</blockquote>
<div><br>
</div>
<div>Agreed, definitely old hardware. Unfortunately we have
10,000 of these things in production and they have been
playing hardware accelerated mpeg2 fine until we upgraded to
Ubuntu 16.04 and the new mesa package. Now to be specific,
our previous version of linux on these systems we were using
an older software stack and video acceleration pipeline but
it worked perfectly, so we know the hardware is capable.</div>
<div><br>
</div>
<div><b>Old Software Stack:</b></div>
<div>
<ul>
<li>vlc 2.1.5</li>
<li>mesa 11.0.6<br>
</li>
<li>va-api hardware acceleration</li>
<li>libva info: VA-API version 0.38.1<br>
libva info: va_getDriverName() returns 0<br>
libva info: Trying to open
/usr/lib/va/drivers/r600_drv_video.so<br>
libva info: Found init function __vaDriverInit_0_35<br>
libva info: va_openDriver() returns 0<br>
vainfo: VA-API version: 0.38 (libva 1.6.2)<br>
vainfo: Driver version: Splitted-Desktop Systems VDPAU
backend for VA-API - 0.7.4<br>
vainfo: Supported profile and entrypoints<br>
VAProfileMPEG2Simple : VAEntrypointVLD<br>
VAProfileMPEG2Main : VAEntrypointVLD<br>
VAProfileMPEG4Simple : VAEntrypointVLD<br>
VAProfileMPEG4AdvancedSimple : VAEntrypointVLD<br>
VAProfileH264Baseline : VAEntrypointVLD<br>
VAProfileH264Main : VAEntrypointVLD<br>
VAProfileH264High : VAEntrypointVLD<br>
VAProfileVC1Simple : VAEntrypointVLD<br>
VAProfileVC1Main : VAEntrypointVLD<br>
VAProfileVC1Advanced : VAEntrypointVLD<br>
</li>
</ul>
<b>New Software Stack:</b><br>
</div>
<div>
<ul>
<li>vlc 2.2.2</li>
<li>mesa 18.2.8-2~bpo9+1</li>
<li>vdpau hardware acceleration</li>
</ul>
<div>The reason we had to switch to VDPAU with Ubuntu 16.04
is that we saw a major regression with mpeg2 playback
using va-api. It was capable of playing back mpeg4 without
any issues. Now that we have switched to VDPAU however, we
are seeing this GPU thread lockup bug and thus causing X
and other GUI related programs to crash and requiring a
reboot to recover.</div>
</div>
<div><br>
</div>
<div>Changing out hardware for the next best thing is not an
option at our scale and we know that the hardware is capable
due to past experiences. We are just in need of assistance
with someone or some party that knows that stack a lot more
than us to help dig to the core issue of the lockup or help
us get VA-API working for mpeg2 in 16.04.</div>
<div><br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">So the best approach is
probably to not use hardware acceleration for MPEG2 clips in
general.<br>
</blockquote>
<div><br>
</div>
<div>With software decoding, the performance doesn't produce
something that is watchable. One interesting tidbit to note.
During our testing we put Ubuntu 19.10 on one of these boxes
and noticed that full software acceleration has improved to
the point that VA-API nor VDPAU was required for VLC to
render the mpeg2 and mpeg4 streams correctly. Is this
something that could potentially be backported to Ubuntu
16.04? I know this is a much bigger task that the one
sentence ask alludes to, but figured I'd ask anyway.</div>
<div><br>
</div>
<div>We are more than welcome to work together on this,
especially since the hardware is older and probably hard to
find. Just needing to find a solution so we can move forward
on upgrading the software and on these older hardware.</div>
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<br>
<div class="gmail_quote" style="">
<div dir="ltr" class="gmail_attr">On Thu, Nov 28, 2019 at 7:15
AM Christian König <<a href="mailto:ckoenig.leichtzumerken@gmail.com" moz-do-not-send="true">ckoenig.leichtzumerken@gmail.com</a>>
wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF">
<div>Hi Will,<br>
<br>
well that's the very first APU generation and
unfortunately nobody is working on that old hardware any
more.<br>
<br>
MPEG2 is known to not be fully supported by that chipset
in general. So the best approach is probably to not use
hardware acceleration for MPEG2 clips in general.<br>
<br>
Regards,<br>
Christian.<br>
<br>
Am 27.11.19 um 18:35 schrieb Will DeBerry:<br>
</div>
<blockquote type="cite">
<div dir="ltr">Hi all,
<div><br>
</div>
<div>I am reaching out hoping to get some assistance
with resolving a bug/crash that we see with the GPU
when using VDPAU hardware acceleration on Ubuntu
16.04. This is specific to the r600 drivers
interacting with VDPAU when trying to playback
certain mpeg2 content.</div>
<div><br>
</div>
<div><b>GPU in question per lscpi: </b></div>
<div>00:01.0 VGA compatible controller: Advanced Micro
Devices, Inc. [AMD/ATI] Wrestler [Radeon HD 6320]</div>
<div><br>
</div>
<div>We are highly invested in this GPU and would love
to get this addressed as soon as possible and are
also willing to sponsor this work if needed.</div>
<div><br>
</div>
<div><b>Steps to Recreate:</b></div>
<div>
<ol>
<li>Launch VLC with VDPAU hardware acceleration
and deinterlacing enabled</li>
<li>Play the attached piece of known bad content</li>
<li>Wait for GPU lockup</li>
</ol>
<div>Per dmesg, the GPU thread gets locked up within
the kernel and thus breaks all GUI related
activities until the PC is rebooted.</div>
</div>
<div><br>
</div>
<div><b>Mesa Version Tested:</b></div>
<div>18.0.5-0ubuntu0~16.04.1<br>
</div>
<div>18.2.8-2~bpo9+1<br>
</div>
<div><br>
</div>
<div>Let me know if you have any questions or are
interested in discussing this further.</div>
<div><br>
</div>
<div>Thanks,</div>
<div>
<div><br>
</div>
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<pre>_______________________________________________
mesa-dev mailing list
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