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PreSlav

Which of these video encodes is of higher quality?

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Posted · Original PosterOP

Hi guys, 

 

I'm choosing between these two encodes of the same movie: one is in SDR x264 with a higher bitrate and 8 bit colour and the second is in x265 hevc in HDR at a lower bitrate and 10-bit colour? I know x265 is way more efficient but given these differences, which picture quality would be superior? (given that my tv does accept hdr signal but is not a true HDR high brightness monster).

 

Best,

 

 

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6 minutes ago, PreSlav said:

I'm choosing between these two encodes of the same movie: one is in SDR x264 with a higher bitrate and 8 bit colour and the second is in x265 hevc in HDR at a lower bitrate and 10-bit colour?

Given the limited amount of information you are giving, I'd go with the HEVC-one.


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but why 10bit at all?


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Posted · Original PosterOP
1 minute ago, Jurrunio said:

but why 10bit at all?

You mean why since my tv is not 10-bit or?


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10 minutes ago, PreSlav said:

You mean why since my tv is not 10-bit or?

yup


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On 12/9/2019 at 3:45 AM, Jurrunio said:

but why 10bit at all?

From what I gather, using 10 bit allows for (slightly) smaller file sizes at otherwise similar settings. Though I hadn't tested this much myself.


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10 hours ago, Zodiark1593 said:

From what I gather, using 10 bit allows for (slightly) smaller file sizes at otherwise similar settings. Though I hadn't tested this much myself.

That's not very logical - 10 bit colour vs 8 bit colour means that each colour value uses 10 bits instead of 8 bits, because there's a much higher variation in colour choices (256 choices per 8-bit channel and 1024 choices per 10-bit channel - RGB of course).

 

So intuitively, all things being equal, 10-bit video should be larger than an otherwise identical 8-bit video.

 

Now, there could be some software things going on that negate that, but I'm not versed enough to say.


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2 minutes ago, dalekphalm said:

That's not very logical - 10 bit colour vs 8 bit colour means that each colour value uses 10 bits instead of 8 bits, because there's a much higher variation in colour choices (256 choices per 8-bit channel and 1024 choices per 10-bit channel - RGB of course).

 

So intuitively, all things being equal, 10-bit video should be larger than an otherwise identical 8-bit video.

 

Now, there could be some software things going on that negate that, but I'm not versed enough to say.

Color dithering requires a significant amount of data. I suppose if the intended color can be determined and encoded into a higher color depth, bit rate can be reduced.


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5 minutes ago, Zodiark1593 said:

Color dithering requires a significant amount of data. I suppose if the intended color can be determined and encoded into a higher color depth, bit rate can be reduced.

Could be - but enough to counteract the naturally larger size of each frame?

 

I'd want to see testing compare each. I'm sure there's a sweet spot, but which one wins? 10 bit w/ less dithering, or 8 bit w/ more dithering?

 

Would be an interesting head-to-head.


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6 hours ago, dalekphalm said:

Could be - but enough to counteract the naturally larger size of each frame?

 

I'd want to see testing compare each. I'm sure there's a sweet spot, but which one wins? 10 bit w/ less dithering, or 8 bit w/ more dithering?

 

Would be an interesting head-to-head.

Perhaps Taran should get on it? I don't have the resources to make uploads myself. (Cell for internet)


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