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<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Well
how was the stack configured then? Pure software playback?<br>
</blockquote>
<div><br>
</div>
<div>In 19.10, yes the whole stack was told to use software
playback and decoding. </div>
</blockquote>
<br>
I would investigate this way. 1920x1080 is not a high resolution
and should decode with the CPU just fine.<br>
<br>
<blockquote type="cite">Our older Gentoo based setup with the old
software stack worked fine</blockquote>
<br>
The hardware generally does not support some interlaced
frame/field features rarely used in todays MPEG2 streams and a
software fallback isn't easily doable with VA-API/VDPAU and so was
never implemented.<br>
<br>
Are you sure that the Gentoo based setup isn't software decoding
based?<br>
<br>
Regards,<br>
Christian.<br>
<br>
Am 02.12.19 um 16:02 schrieb Will DeBerry:<br>
</div>
<blockquote type="cite" cite="mid:CADbdyxXBw1XrGqptndF_XX=gxSz=mbz41Osk04v0qHdbXXB1cQ@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">What regression was that?
The difference between VDPAU and VA-API is only marginal for
codec support.<br>
</blockquote>
<div><br>
</div>
<div>The regression revolved around deinterlacing the content.
If we had to deinterlace 1080i for instance, the playback
was very choppy and dropped frames.</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">Well how was the stack
configured then? Pure software playback?<br>
</blockquote>
<div><br>
</div>
<div>In 19.10, yes the whole stack was told to use software
playback and decoding. </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">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>
</blockquote>
<div><br>
</div>
<div>That's part of the problem. We do have high resolution
(1920x1080) mpeg2 at the places we are installed. We have no
control over what content is available but have to support
it. </div>
<div><br>
</div>
<div>Our older Gentoo based setup with the old software stack
worked fine but the Ubuntu 16.04 stack does not playback the
same content without having to switch to VDPAU and thus
introduce the GPU thread lockup issue. Ubuntu 18.04 looks to
have the same VDPAU GPU lockup issue as well and cannot use
software playback/decoding successfully. </div>
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<br>
<div class="gmail_quote" style="">
<div dir="ltr" class="gmail_attr">On Mon, Dec 2, 2019 at 9:16
AM Christian König <<a href="mailto:christian.koenig@amd.com" target="_blank" moz-do-not-send="true">christian.koenig@amd.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>
<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">
<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>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Thu, Nov 28,
2019 at 7:15 AM Christian König <<a href="mailto:ckoenig.leichtzumerken@gmail.com" target="_blank" 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>_______________________________________________
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