[XviD-devel] [RFC] kthresholding in 2pass2

Edouard Gomez ed.gomez at free.fr
Mon Dec 1 23:44:03 CET 2003


Michael Militzer (michael at xvid.org) wrote:
> 4)  Someone (LigH  iirc)  reported that  2pass  wouldn't work  without
> b-frames and  showed a  graph that should  prove that all  frames were
> simply quantized with  quant 31? Is there any truth  in this report or
> did I just misinterprete it?

I cannot reproduce the bug.

Using these settings, "chroma_me:vhq=1" i  get these results on a subset
of my tests  sequences. These sequences are all  ~3000 frames long. Note
that futurama test add cartoon to common options.

===============================================================================
Test name: underworld-trailer
First pass stats missing.
Performing first pass.
Caching first pass stats
Using cached first pass stats (hash - da6afeace28d6a5b5792565b24a2fa85)

Results:
xvid:     Min PSNR y : 29,50 dB, u : 33,06 dB, v : 36,63 dB
xvid: Average PSNR y : 39,04 dB, u : 42,74 dB, v : 45,14 dB
xvid:     Max PSNR y : 99,99 dB, u : 54,15 dB, v : 54,15 dB
===============================================================================
===============================================================================
Test name: pearl-harbor
First pass stats missing.
Performing first pass.
Caching first pass stats
Using cached first pass stats (hash - da6afeace28d6a5b5792565b24a2fa85)

Results:
xvid:     Min PSNR y : 34,12 dB, u : 38,94 dB, v : 39,41 dB
xvid: Average PSNR y : 38,63 dB, u : 42,73 dB, v : 43,82 dB
xvid:     Max PSNR y : 43,40 dB, u : 45,15 dB, v : 48,71 dB
===============================================================================
===============================================================================
Test name: matrix-reloaded-trailer
First pass stats missing.
Performing first pass.
Caching first pass stats
Using cached first pass stats (hash - da6afeace28d6a5b5792565b24a2fa85)

Results:
xvid:     Min PSNR y : 26,98 dB, u : 34,64 dB, v : 31,17 dB
xvid: Average PSNR y : 36,76 dB, u : 40,54 dB, v : 41,49 dB
xvid:     Max PSNR y : 69,43 dB, u : 69,43 dB, v : 69,43 dB
===============================================================================
===============================================================================
Test name: matrix-reloaded-teaser
First pass stats missing.
Performing first pass.
Caching first pass stats
Using cached first pass stats (hash - da6afeace28d6a5b5792565b24a2fa85)

Results:
xvid:     Min PSNR y : 25,11 dB, u : 31,14 dB, v : 31,47 dB
xvid: Average PSNR y : 34,82 dB, u : 39,59 dB, v : 39,89 dB
xvid:     Max PSNR y : 99,99 dB, u : 64,00 dB, v : 64,00 dB
===============================================================================
===============================================================================
Test name: matrix-revolutions-trailer
First pass stats missing.
Performing first pass.
Caching first pass stats
Using cached first pass stats (hash - da6afeace28d6a5b5792565b24a2fa85)

Results:
xvid:     Min PSNR y : 27,28 dB, u : 34,29 dB, v : 33,68 dB
xvid: Average PSNR y : 37,01 dB, u : 41,77 dB, v : 41,73 dB
xvid:     Max PSNR y : 72,38 dB, u : 66,36 dB, v : 66,36 dB
===============================================================================
===============================================================================
Test name: lotr-ttt
First pass stats missing.
Performing first pass.
Caching first pass stats
Using cached first pass stats (hash - da6afeace28d6a5b5792565b24a2fa85)

Results:
xvid:     Min PSNR y : 29,80 dB, u : 37,26 dB, v : 36,94 dB
xvid: Average PSNR y : 33,67 dB, u : 43,05 dB, v : 43,66 dB
xvid:     Max PSNR y : 52,88 dB, u : 56,04 dB, v : 62,48 dB
===============================================================================
===============================================================================
Test name: futurama
First pass stats missing.
Performing first pass.
Caching first pass stats
Using cached first pass stats (hash - ceba39db49329ddd540174f24ef15558)

Results:
xvid:     Min PSNR y : 32,25 dB, u : 35,57 dB, v : 34,50 dB
xvid: Average PSNR y : 36,11 dB, u : 39,39 dB, v : 38,62 dB
xvid:     Max PSNR y : 41,82 dB, u : 43,21 dB, v : 42,84 dB
===============================================================================

-- 
Edouard Gomez


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