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Old 12th April 2013, 01:55   #1  |  Link
minaust
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x264 - 8-bit vs 10-bit?

Howdy everybody...

I've done a bit of homework here as to the pros and cons of 8-bit versus 10-bit encoding, and here are my assumptions:

1. 10-bit encodes will play only on my PC. Nowhere else.
2. 10-bit encodes don't have a banding problem endemic to the 8-bit encoder.

As to my needs, 1 is no problem as I use my PC as a video jukebox, and I haven't encountered 2 (yet). Is there any reason to NOT switch to 10-bit x264? Are my assumptions correct? Any more pros or cons I should know about?

Thanks for any replies.
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Old 12th April 2013, 02:19   #2  |  Link
Asmodian
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Those are the basics but also:
Pro: 10-bit is higher quality (not just the improvement in banding) at the same bitrate.
Con: 10-bit encodes a bit slower and takes more CPU power to play.
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Old 12th April 2013, 05:42   #3  |  Link
Overdrive80
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In my opinion, bigger 10bit encoderīs trouble is compatibility. If this isnt trouble then x264 10bit is your best choice.
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Old 12th April 2013, 06:57   #4  |  Link
minaust
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Quote:
Originally Posted by Asmodian View Post
Those are the basics but also:
Pro: 10-bit is higher quality (not just the improvement in banding) at the same bitrate.
Con: 10-bit encodes a bit slower and takes more CPU power to play.
I ran a test - I grabbed my nearest DVD and ripped a trailer. Basic processing: Autoceop, resize to 852x364, removegrain, then sharpen a little.

10-bit - 78 fps.
8-bit with same settings - 93 fps.

10-bit is indeed slower, but not unacceptably so. Now on my old 'puter , an old 2.8ghz P4 it would be a big deal.

Playback is with Media Player Classic HC using MADVR as the renderer. Will 10-bit use more CPU, GPU, or both? Not that it really matters - when I'm doing an encode or playing back it's typically the only thing going on. Only my CPU fan will care.
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Old 12th April 2013, 07:13   #5  |  Link
minaust
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Quote:
Originally Posted by Overdrive80 View Post
In my opinion, bigger 10bit encoderīs trouble is compatibility. If this isnt trouble then x264 10bit is your best choice.
Thank you gentlemen. You've sold me on 10-bit builds of x264 henceforth.



On the other hand, now I gotta re-rip my whole inventory....
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Old 12th April 2013, 07:30   #6  |  Link
kypec
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Quote:
Originally Posted by minaust View Post
On the other hand, now I gotta re-rip my whole inventory....
Does your whole inventory suffers from visible deficiencies like banding? Otherwise it's pretty pointless to re-encode dozens of DVD when existing 8-bit quality pleases one's eyes enough.
Quote:
Originally Posted by minaust View Post
Will 10-bit use more CPU, GPU, or both?
Mainly CPU because 10-bit decoding is not possible with current GPU. I'm not familiar with MadVR requirements for 10-bit post-processing though...
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Old 12th April 2013, 13:04   #7  |  Link
minaust
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Does your whole inventory suffers from visible deficiencies like banding? Otherwise it's pretty pointless to re-encode dozens of DVD when existing 8-bit quality pleases one's eyes enough.
No, they suffer from a brain fart on my part. I accidentally formatted the external drive storing them. Fortunately my vidcaps were elsewhere.

Since I was already going to re-rip anyway.... Let's straighten out this 8/10-bit thingie...
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Old 15th April 2013, 06:49   #8  |  Link
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It is possible to "unformat" a drive if you haven't put any new files on it yet. Otherwise things get trickier.
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Old 16th April 2013, 05:15   #9  |  Link
minaust
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It is possible to "unformat" a drive if you haven't put any new files on it yet. Otherwise things get trickier.
I thought about that about 30 seconds too late... Ah well, nothing irreplaceable was lost. Just a bunch of re-ripping.

If my vidcaps has been on that drive.... I wouldn't be fit company for a while.
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