x264 quicksync video nvnc
vce there is no shortage of ways to
transform your screen into a video stream visible to potentially millions
of people around the world for the Mad
Ballers Among Us a second PC dedicated
to that task is the Undisputed king of
performance and quality but how do the
rest of us get our streams going without
Crossing them up AMD claims to have the
best solution but do they welcome to a new
episode of Manufacturers
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description one of AMD's top marketing points is that the 16 threads in their
ryzen 7 CPUs allow Gamers to dedicate
ample CPU resources to both gaming and
video streaming coding without impacting the performance of either since games
won't make use of all 16 threads and
neither will an coder meanwhile one of
Intel selling points for their consumer level chips is their integrated graphics
processor and its ability to use
quicksync video technology to encode a
video stream without impacting the performance of their
CPU well that all sounds great but with
both of them claiming to achieve the same objective by very different means
well surely one of them's got to be better right well predictably enough AMD
says that their way software encoding is
superior and the traditional wisdom
would back them up on this one the software-based
x264 encoder is well known to offer
higher image quality and more flexibility in its setup compared to
other Solutions but until now if you
cared about performance you'd almost never use it while gaming because its
consumption of system resources was pretty much guaranteed to impact your
gameplay unless you were running an extreme Edition or something like that
but with more processing cores at ryzen 7's disposal it could be that AMD is on
to something meanwhile what are the
other guys doing different here Intel's Quicks sync video and for that matter
NVIDIA's nvnc and rtgs radon video codec
engine are all what are known as dedicated hardware-based encoders which
present an interesting conundrum in theory you actually stand to lose
virtually no performance which is cool
but you're forced to use the optimized
settings that are baked into the hardware meaning that you can't really
tune anything beyond their presets besides simply increasing the raw bit
rate to improve quality so finally back
to the big questions how much does the encoder matter for quality is twitch's
new maximum of 6 megabits per second enough that it won't really matter
anymore are any of these Solutions
really able to untether you from the second PC and let you stream without
impacting performance well we touched on this from
AMD's perspective in our ryzen 7 review
which you can check out here and we asked you guys at that time if you
wanted something more in depth and since you did ask so nicely your wish is our
Command we're going to focus on two games for our testing first ashes of the
singularities CPU Benchmark not because it's a hot game on Twitch right now but
for technical reasons it stresses the CPU and has a good mix of slow moving
terrain with lots of small fast-moving projectiles that are great at
introducing blocky artifact during encoding the second will be the for
Honor Benchmark with its sweeping cameras and loads of special effects we
know again most people aren't streaming
these games but canned benches are much more repeatable across our platforms and
both of these titles represent a realistic gaming load that is more
demanding than today's popular Esports titles for our encoders we've used
common Twitch streaming bit rates and resolutions for all of our comparisons
you'll note that 1080p30 is technically
more data to cram into our lower bit rates than 720p60 but the higher frame
rate of 720p60 should better highlight
motion artifacts in our encoders so any CPU even one with
onboard Graphics can use x264 encoding
but we observed in our testing that not all are created equal in this regard we
found that AMD's ryzen 7 managed to oh excuse
me just snuck up on me managed to avoid
dropping frames throughout our testing at a higher quality preset than either
of Team Blues Solutions in some cases
even some of our hardware encoders needed lower presets so to find out how
these differences in encoding settings affect real world image quality we
captured a lossless reference recording
with our Blackmagic intensity Pro and used it for comparison so we can see
some subtle differences here ryzen manages to retain smaller details that
get smeared out on team blue at their very fast and super fast settings
compared to ryzen's faster this not only
translates into better picture quality overall but also contributes to better
quality when twitch then re-encodes it
for its various quality options moving on here we see our Hardware encoders at
1080 30p at 2500 kilobit per second
alongside our ryzen x264 footage of the
four x264 on ryzen appears to be the least likely to lose small projectiles
in ashes of The Benchmark nvnc and
quicksync don't seem half bad here to be clear but they do block up more often
and lose finer details when A lot's going on at once rtgs AMF encoder on the
other hand sorry radon fans but
uh things get more interesting again at
720p60 x264 holds up best once more although
the shimmering of compression artifacts on the cobblestones as the camera flies
by is pretty noticeable but not nearly as noticeable as it is with the rest of
our contest nvnc is again at the head of the
hardware pack looking decent but our
quick sync and AMF footage are both abysmal at times blocking up so badly as
to appear as though they'd been recorded at 240p instead of
720p we'll keep our visual comparisons rolling while we move on to Performance
with x264 we see a respectable showing
from our ryzen 7 1800x at averaging
about a 5 to 10% performance penalty on
the faster and very fast presets over
our Baseline reading on the 6900k
meanwhile we get an average of a roughly 3 to
23% Performance drop clearly a much more
varied result while our 7700k could get
as high as a 36% hit both of these ones on the super
fast preset AMD high-speed Infinity
fabric interconnect secret sauce for ryzen's video encoding while gaming
performance looks like it's working so
far our Hardware tests meanwhile show
ryzen actually taking a wider hit with nvenc at roughly 5 to 15% on average
while our 6900k managed a 3 to 10%
variance and our 7700k ranged from 2 to
18% rg's AMF encoder seemed to hit all
of our chips less with ryzen taking a
roughly 7 to 8% performance hit and sitting in between the other two though
as we've seen the AMF encoder is also far from the highest quality for
streaming but we have one final encoder
one that we can't directly compare with any other CPU and that's Intel's
quicksync video compared to the 7700k
Baseline it caused a 3 to 12% performance drop about in line with the
rest of our Hardware encoders so finally then lining all our encoders up next to
each other we can see that actually
ryzen running x264 blows the doors off every other CPU
encoder combination it has a tight
variation in its performance impact over our Baseline numbers and it has a higher
quality CPU preset meaning that when twitch re-encodes you lose less detail
overall so taken together it looks like
AMD's marketing department wasn't asleep
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