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Old 26th September 2017, 06:20   #661  |  Link
littlepox
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Another concern would be regarding the wording.
If I have 10 apples and you have 24, can you claim that you have 2.4x more apples than me?

To me, even "On average, JPEG requires a bit rate that is 139% higher (2.39x) than HEVC to achieve identical quality to HEVC Intra compression. I rounded this to 2.4x. " is true, I can only conclude HEVC is 1.39x(or 1.4x) more efficient than JPEG.

Alternatively, I can conclude HEVC is 2.39x(or 2.4x) as efficienct as JPEG.

I know that people often use them in a very confusing way, but from the point of rigorous mathematics, when you use "more than" after a quantity, you need to do minus.

Last edited by littlepox; 26th September 2017 at 06:37.
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Old 26th September 2017, 10:43   #662  |  Link
Jamaika
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This is just a matter of codecs advertising. The truth is that HEIF images aren't implemented ie BPG or HEIF. Producers favor weaker processors for JPEG processing.
What about converting mjpeg movies to YUV? It is a tragedy and it's good that the codec comes out of the outlet. Despite the recommendations, it's better to do it with RGB.

source --> mjpeg(yuv422p10bit)(higer quality) --> x264(yuv422p10bit)
source --> RGB --> x264(yuv422p10bit)


PS I haven't convinced the PSNR or other metrics. VMAF advertising is also only available on paper.
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Old 26th September 2017, 15:13   #663  |  Link
x265_Project
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Quote:
Originally Posted by littlepox View Post
Another concern would be regarding the wording.
If I have 10 apples and you have 24, can you claim that you have 2.4x more apples than me?

To me, even "On average, JPEG requires a bit rate that is 139% higher (2.39x) than HEVC to achieve identical quality to HEVC Intra compression. I rounded this to 2.4x. " is true, I can only conclude HEVC is 1.39x(or 1.4x) more efficient than JPEG.

Alternatively, I can conclude HEVC is 2.39x(or 2.4x) as efficienct as JPEG.

I know that people often use them in a very confusing way, but from the point of rigorous mathematics, when you use "more than" after a quantity, you need to do minus.
Good point.
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