[x265] Bitrate control: Zones are ignored in any but the first pass in n-pass encodes

[Mario *LigH* Rohkrämer]

I created graphs based on the following sequence:

x265 --y4m foreman_cif_pal.y4m --zones 0,99,b=5.0/100,199,b=0.2 --bitrate  
1000 --pass 1 --csv-log-level 2 --csv foreman_cif_pal.pass1.csv
x265 --y4m foreman_cif_pal.y4m --zones 0,99,b=5.0/100,199,b=0.2 --bitrate  
1000 --pass 3 --csv-log-level 2 --csv foreman_cif_pal.pass3.csv
x265 --y4m foreman_cif_pal.y4m --zones 0,99,b=5.0/100,199,b=0.2 --bitrate  
1000 --pass 2 --csv-log-level 2 --csv foreman_cif_pal.pass2.csv

(foreman_cif_pal.y4m is just fixed to 25 fps as it should be with 352x288  
pixels)

Please find a PDF attached with the graphs revealing that the (quite  
extreme) bitrate factors in the zones (*5.0 for 0..99, *0.2 for 100..199)  
are not respected in pass 3 and pass 2. They are respected only in pass 1  
(and also in 1-pass CRF or ABR).

-- 

Fun and success!
Mario *LigH* Rohkrämer
mailto:contact at ligh.de
 
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