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[Extremetech] H.265 benchmarked ! Does the next-generation video codec live up to expectations? - Page 2

post #11 of 15
Quote:
Originally Posted by brucethemoose View Post

More horsepower to decode?

If existing/upcoming ARM SOCs can't handle decoding h.265, it'll be a useless standard for awhile.


And isn't encoding already extremely parallelizable? I thought today's encoders/transcoders just split videos into multiple segments for each core to work on...

Yea but you can parallel the jobs, the only thing you need to work out is scheduling. Remember, this is not hardware accelerated at all. When they actually build the logic gates into some silicon, encode / decode processing shouldn't be an issue at all.
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post #12 of 15
Quote:
Originally Posted by brucethemoose View Post

More horsepower to decode?

If existing/upcoming ARM SOCs can't handle decoding h.265, it'll be a useless standard for awhile.


And isn't encoding already extremely parallelizable? I thought today's encoders/transcoders just split videos into multiple segments for each core to work on...
They can always make a ASIC for hardware support of h.295. However, upcoming ARM SoC will have plenty more power than most mainstream SoCs today.

From how they are describing it, it looks to be even more parallelizable across both CPU and GPU...


THG has a comparison of the encoders: http://www.tomshardware.com/reviews/x265-hevc-encoder,3565-3.html
H.265 can consistently use all available cores while H.264 cannot.
Edited by DuckieHo - 7/25/13 at 8:37am
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post #13 of 15
This is good news, I'm all for higher quality video in smaller packages, it's really good news indeed
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post #14 of 15
Quote:
Originally Posted by Ma15 View Post

VP9 is comparable to x264 @ 3.0 (It's not even Blu-ray quality)

I don't think the jump to h265 from h264 in terms of processing power required to decode is anything to worry about. A lot of people had the same concern going to Hi10 and the original h264.

If these benchmarks are true, then the filesize reduction at the same CRF seems to be around 50% which is huge. From xVid to h264 was around 30% reduction, and h264 to Hi10 was around 15-20%. So I guess the jump from Hi10 to h265 will see similar gains as going to h264 from xvid.
CRF is a relative metric, you can't use it to gauge quality if you change *anything*. x264 @ CRF 20 with Psy RDO on is very different to x264 @ CRF 20 with Psy RDO off. And you're comparing across encoders...
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post #15 of 15
Quote:
Originally Posted by Coma View Post

Quote:
Originally Posted by Ma15 View Post

VP9 is comparable to x264 @ 3.0 (It's not even Blu-ray quality)

I don't think the jump to h265 from h264 in terms of processing power required to decode is anything to worry about. A lot of people had the same concern going to Hi10 and the original h264.

If these benchmarks are true, then the filesize reduction at the same CRF seems to be around 50% which is huge. From xVid to h264 was around 30% reduction, and h264 to Hi10 was around 15-20%. So I guess the jump from Hi10 to h265 will see similar gains as going to h264 from xvid.
CRF is a relative metric, you can't use it to gauge quality if you change *anything*. x264 @ CRF 20 with Psy RDO on is very different to x264 @ CRF 20 with Psy RDO off. And you're comparing across encoders...
I never mentioned varying any x264 settings among two different encodes, so I have no idea why you would go off on such a tangent.

And you certainly can compare across encoders by keeping certain variables constant (crf, target bit-rate/file size). How could we compare the efficiency amongst encoding algorithms even though it may not be 100% accurate.
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