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<div class="moz-cite-prefix">On 26.04.19 06:12, Phyllis Smith wrote:<br>
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cite="mid:CAOckJE0AUp__qGz=wj0BxC6Aw_9CDwX1+koySLXV6CDsgNjtkA@mail.gmail.com">
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<div class="gmail_default" style="font-size:small">Pierre:
just some commentary here.<br>
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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">I wish it had worked
better....<br>
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<div><span class="gmail_default" style="font-size:small">That
is what I was afraid of.</span> </div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<br>
I did a lot of tests with the same.xml file that contains
4 mixers. Each <br>
time I checked both with mpeg proxies and original DNxHD
sources.<br>
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<div><span class="gmail_default" style="font-size:small">When
I load DNxHD sources, it falls back to using software as
seen on the startup window:<br>
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<div><span class="gmail_default" style="font-size:small"><br>
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<div style="margin-left:40px"><span class="gmail_default"
style="font-size:small"></span> Decoder dnxhd does not
support device type vdpau.<br>
HW device init failed, using SW decode.<br>
<a class="moz-txt-link-freetext" href="file:/root/Downloads/DNx145_1080i_2997.gxf">file:/root/Downloads/DNx145_1080i_2997.gxf</a><br>
err: Success</div>
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<div style="font-size:small" class="gmail_default">FFmpeg
apparently can not handle dnxhd with vdpau so that would
be why you see not speed up for those.<br>
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<p>Here are some background information about hardware acceleration.<br>
<br>
Hardware acceleration means that only the most common codecs, such
as MPEG-2 and MPEG-4, are accelerated. The graphics card
manufacturers have optimized the GPU to be able to play these
certain video formats particularly efficiently. Conversely, this
means that many other formats are not optimized and are played
back normally unoptimized. These unoptimized formats do not
provide any speed advantages. In this case, the CPU is normally
used in the same way as if the hardware acceleration were
deactivated.<br>
The hardware acceleration only makes sense if you have a
relatively strong graphics card. Very old graphics cards or
non-performing graphics cards will probably bring only little
speed advantage or no speed advantage at all. <br>
<br>
But if you work for example with MPEG-2, MPEG-4 and H.264/MPEG-4
AVC encoded video material, you will see a significant speed
advantage and performance increase. Depending on the graphics
card, up to ten times higher processing speeds can be achieved.<br>
<br>
Nvidia supports VDPAU. The following video formats are supported
optimized:<br>
MPEG-1, MPEG-2, MPEG-4 ASP (MPEG-4 Part 2), H.264/MPEG-4 AVC and
VC-1, WMV3/WMV9<br>
<br>
There are hundreds of different graphics cards, so the setting of
one user does not necessarily have to be the same as the setting
of another user. Here everyone has to test which setting is the
best, otherwise if you only cut smaller videos from time to time
and then use other codecs than the ones mentioned above, it is
recommended to use the default settings without all the hardware
tests.<br>
<br>
Sam<br>
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