X264 version375
來源：苺乱扔 op(特典映像)，Aviutl吃D2V過manual IVTC後砍掉黑色畫面，Helix YV12出來
1.04GB，2158frames，一分半鐘
給VirtualDubMod做x264(Average Bitrate 1000)編碼

修改一下x264預設值為
Keyframe Boost(%) 40
B-frames reduction(%) 30
Bitrate variability(%) 60
Min QP 1
Max QP 51
Max QP Step 50
Scene Cut Threshold(40)
Min IDR-frame interval(24)
Max IDR-frame interval(240)
Max Ref. frames(1)，Mixed Refs(關)
Partition decision(fastest)
Hexagonal Search
CABAC(開)
Deblocking filter(關)
B-frame相關功能(關)
Macroblock Partitions(全開)
8x8 Transform(開)
Average SSIM= 91.90148078

以下列出的是與原設定相異處
CABAC(關)
Average SSIM= 91.27780335
PS:CABAC開一下好了

Scene Cut Threshold (100)
Average SSIM= 91.88731775
Scene Cut Threshold (-1)
Average SSIM= 91.57664640
PS:用預設40即可

Exhaustive Search(Range 4)
Average SSIM= 91.91071769
Exhaustive Search(Range 16)
Average SSIM= 92.01615874
Exhaustive Search(Range 64)
Average SSIM= 92.03891641
PS:Method越複雜&Range越大是有提升一下畫質，但Range 別調太大，cpu吃很兇滴，調Range 64根本是瘋了

Partition decision(slowest),Chroma ME(關)
Average SSIM= 92.66079678
Partition decision(slowest),Chroma ME(開)
Average SSIM= 92.67823742
PS:Chroma ME請開啟，slowest很慢就不多談，跟fastest相差大約有0-2 quantizer
Q值差0-2感覺不太出來，所以我都用fastest

8x8 intera search(關)，8x8 Transform(開)
Average SSIM= 91.80049168
8x8 Transform(關)
Average SSIM= 91.80536943
PS:這功能還是全開算了

Max Ref. frames(1)，Mixed Refs(開)
Average SSIM= 91.87405675
Max Ref. frames(16)，Mixed Refs(關)
Average SSIM= 92.63757646
Max Ref. frames(16),Mixed Refs(開)
Average SSIM= 92.68441201
PS:Max Ref. frames提高升畫質，此時再開Mixed Refs再升點畫質
不過Max Ref. frames(1)時，開Mixed Refs卻降了點畫質....怪

再來是B-Frames
Adaptive B-Frames,Max consecutive(1),Temporal,Bias(0)
Average SSIM= 92.03950535
Adaptive B-Frames,Max consecutive(1),Spatial,Bias(0)
Average SSIM= 92.08868290
Adaptive B-Frames,Max consecutive(2),Temporal,Bias(0),Weighted biprediction(關),Use as references(關)
Average SSIM= 91.99866686
Adaptive B-Frames,Max consecutive(2),Temporal,Bias(0),Weighted biprediction(開),Use as references(關)
Average SSIM= 92.02008498
Adaptive B-Frames,Max consecutive(2),Temporal,Bias(0),Use as references(開),Weighted biprediction(關)
Average SSIM= 91.85026120
PS:Spatial畫質似乎好些，官網是把Temporal當預設.....怪
Max consecutive(2)時，Weighted biprediction畫質小提升，Use as references畫質小降
從ssim看來Max consecutive(2)跟Max consecutive(1)相比，(2)似乎沒啥益處

上面只有CBR測試(今天測的)，其實我以前有私下測CQ然後調設定值，但是發現跟今天的結果不太一樣
當時測CQ是Scene Cut Threshold(-1)跟B-frames功能關閉畫質較好些....又一怪事
另外x264 CQ12的SSIM值較接近Divx跟Xvid的CQ1，有空的人也可以試試看結果是否如此
就醬子