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Old 8th June 2017, 21:33   #273  |  Link
IgorC
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Join Date: Apr 2004
Posts: 1,315
Quote:
Originally Posted by LigH View Post

But expecting a 1:2 breakthrough in lossy still image compression sounds like a miracle to me, if I do not even expect that to happen in video compression.

Even more than the "revolutions" (e.g. something else than DCT windows) which happened from MP3 over VQF and Vorbis towards Opus in the audio world.

Something that might come at least close was V-Nova, the "noise modelling" in video compression, similar to mp3Pro and HE-AAC.
Yes, 2x ratio is hard to achieve.

Considering that JPEG comparison (subjective MOS), Daala/HEVC were already approx ~1.6-1.7x of JPEG efficiency at MOS 4(perceptible but not annoying). And the efficiency is 1.2-1.4x at MOS 4.5

If AV1 will have ~10%(?) of better intra prediction then it will be ~1.8x of JPEG efficiency at MOS 4. Rough numbers.


As of audio, Opus, xHE-AAC(USAC) 80 kbps are on par with MP3 128 kbps in my experience. That's 1.6x
And a recent audio standard 3DA apparently will need ~64-72 kbps. That's 1.75-2x.

Last edited by IgorC; 8th June 2017 at 21:41.
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