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Realistic expectations in H.264 encoding times if I overclock my i7-950? - Page 2

post #11 of 13
Quote:
Originally Posted by Blameless View Post

4.8GHz, 24/7 stable, is not remotely a given on an X5660, and is not cheap to cool.
i only say for the thread of the x5660 in the intel forum
post #12 of 13
Quote:
In your case, a 3.06ghz GPU overclocked to 4.2ghz is right about a 30% clockspeed increase. Assuming your RAM is of sufficient bandwidth (it is, based on your sig), then a 1 hour render time would fall by APPROX. 30% That is to say, it would take 42 minutes instead of 60.

Just to be technically correct:

Increasing speed by 30% does not mean reducing encoding time by 30%.

^Using this, above logic - if you increase speed by 90%, your CPU is 1.9x faster, but gets the work done in 10% of the original time - it would have to be 10x faster to do that

you need to be careful with how you handle multipliers, as 1.3x faster is not equal to 0.7x time taken

1000 frames at 10fps takes 100 seconds

1000 frames at 13fps takes ~77 seconds, not 70

1000 frames at 15fps takes ~66 seconds, not 50

1000 frames at 18fps takes ~55 seconds, not 20

etc~


OC will cut down times, but won't revolutionize them. I'd honestly look towards encoding settings/methods as they can make much bigger dents.


As for GPU encoding, it's fast but not particularly efficient. If x264 at ~medium-veryfast preset is not good enough for you and you don't want to sacrifice resolution and you're already down to 30fps video, there's not too much to do i think
Edited by Cyro999 - 3/19/14 at 5:35pm
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post #13 of 13
Quote:
Originally Posted by Cyro999 View Post

Just to be technically correct:

Increasing speed by 30% does not mean reducing encoding time by 30%.

^Using this, above logic - if you increase speed by 90%, your CPU is 1.9x faster, but gets the work done in 10% of the original time - it would have to be 10x faster to do that

you need to be careful with how you handle multipliers, as 1.3x faster is not equal to 0.7x time taken

1000 frames at 10fps takes 100 seconds

1000 frames at 13fps takes ~77 seconds, not 70

1000 frames at 15fps takes ~66 seconds, not 50

1000 frames at 18fps takes ~55 seconds, not 20

etc~


OC will cut down times, but won't revolutionize them. I'd honestly look towards encoding settings/methods as they can make much bigger dents.


As for GPU encoding, it's fast but not particularly efficient. If x264 at ~medium-veryfast preset is not good enough for you and you don't want to sacrifice resolution and you're already down to 30fps video, there's not too much to do i think

Your point is mathematically correct and well made. yessir.gif thank you. smile.gif
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Heisenberg
(10 items)
 
Redemption
(18 items)
 
 
CPUGraphicsRAMHard Drive
Intel Core 2 Extreme @ 2.8GHz (upgrade) Intel GMA 950 2 x 2 DDR2 667MHz (upgrade) 120GB Mushkin ECO2 
Optical DriveOSMonitorPower
Replaced with 42 W/hr aux battery Mint 17.3 1280x800 Dell 65w Dell Adapter 
CaseOther
Latitude D630 Chassis Intel 7260-802.11ac 2x2 
CPUMotherboardGraphicsRAM
Not telling AsRock something Pixel Pusher 2 x 8 GB AMD Radeon RAM @ 1600mhz (All the VM's) 
Hard DriveHard DriveHard DriveOptical Drive
Crucial M4 128GB (8 second boot) Western Digital RE4 1TB Western Digital RE4 2TB Pioneer Blu-Ray Reader/Writer 
CoolingOSMonitorKeyboard
Cooler Master Hyper 212 Evo Windows 8.1 Pro x64 Dell U2713HM IBM Model M (CLICKY!!) 
PowerCaseMouseAudio
Antec HCG-900 NZXT Source 210 (it was cheap) Logitech G502 Schiit Modi 
AudioAudio
Sennheiser HD 598 M-Audio AV40's 
CPUMotherboardGraphicsRAM
Intel Core i5-4200U Microsoft BGA1168 Intel HD 4400 8 GB LPDDR3 Dual Channel @ 1600mhz 
Hard DriveOSMonitorKeyboard
SK Hynix 256GB SSD Windows 8.1 Professional 1920 x 1080p IPS Display Microsoft Touch Cover 2 
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