x264增加了新patch

new B-frame decision doom9在7月26日就已经开始讨论测试

但是 就目前来看 new B-frame decision 不容乐观
虽说可以提升 整体质量 3% 淡入淡出部分质量 15%
但是 随着B-frame的开大 B-frame部分的编码运算速度呈线性下降

T5500的U 编码NTSC分辨率的视频 2pass的1st pass下 --bframes 6
只有 11fps 不到 U的占有率为 60% 左右

过去的 --bframes 16 的路子行不通啦

引用

最初由 vempx 发布
--bframes我一直用的是3……
new bframe只是会降低编码速度么？

你可以分别试试 --bframes 6 （9）（12）（16） 看看编码速度如何 再看看U的负载情况

我对编码质量比较追求极致 故此 总是希望 尽可能的开大 --bframes

效率下降是因为frame decision没有multi threading化，如果x264能把这个问题解决了，不光这个patch能实用化，而且还能大幅度提升在多核CPU上的效率

好吧~我来做白鼠

旧的bf5

--[NoImage] Job commandline: "E:\comic\media\megui\MeGUI\tools\x264\x264.exe" --crf 18.0 --ref 5 --mixed-refs --no-fast-pskip --bframes 5 --b-pyramid --b-rdo --bime --direct auto --filter 1,1 --subme 6 --trellis 2 --partitions p8x8,b8x8,i4x4,i8x8 --8x8dct --me umh --merange 32 --threads auto --thread-input --aq-mode 0 --sar 1:1 --progress --no-dct-decimate --no-psnr --no-ssim --output "E:\avi.mp4" "E:\avi.avs" --psy-rd 0
---[NoImage] avis [info]: 512x288 @ 24.00 fps (2157 frames)
---[NoImage] x264 [info]: slice I:9 Avg QP:17.22 size: 31405
---[NoImage] x264 [info]: slice P:1324 Avg QP:19.15 size: 5810
---[NoImage] x264 [info]: slice B:824 Avg QP:21.49 size: 1525
---[NoImage] x264 [info]: consecutive B-frames: 37.4% 33.5% 8.2% 13.4% 3.5% 3.9%
---[NoImage] x264 [info]: mb I I16..4: 17.8% 18.6% 63.6%
---[NoImage] x264 [info]: mb P I16..4: 2.8% 3.4% 4.8% P16..4: 29.9% 8.0% 7.6% 0.0% 0.0%skip:43.5%
---[NoImage] x264 [info]: mb B I16..4: 0.2% 0.6% 0.4% B16..8: 17.6% 3.0% 3.1% direct: 4.3% skip:70.7% L0:37.8% L1:48.8% BI:13.4%
---[NoImage] x264 [info]: 8x8 transform intra:31.8% inter:38.9%
---[NoImage] x264 [info]: direct mvs spatial:99.6% temporal:0.4%
---[NoImage] x264 [info]: ref P L0 78.1% 9.8% 6.4% 2.7% 3.0%
---[NoImage] x264 [info]: ref B L0 81.1% 9.9% 5.9% 3.1%
---[NoImage] x264 [info]: ref B L1 96.1% 3.9%
---[NoImage] x264 [info]: kb/s:821.7
---[NoImage] encoded 2157 frames, 24.06 fps, 821.80 kb/s

--------------------------------------------------------------

新的bf5

--[NoImage] Job commandline: "E:\comic\media\megui\MeGUI\tools\x264\x264.exe" --crf 18.0 --ref 5 --mixed-refs --no-fast-pskip --bframes 5 --b-pyramid --b-rdo --bime --direct auto --filter 1,1 --subme 6 --trellis 2 --partitions p8x8,b8x8,i4x4,i8x8 --8x8dct --me umh --merange 32 --threads auto --thread-input --aq-mode 0 --sar 1:1 --progress --no-dct-decimate --no-psnr --no-ssim --output "E:\avi4.mp4" "E:\avi.avs" --psy-rd 0 --b-adapt 2
---[NoImage] avis [info]: 512x288 @ 24.00 fps (2157 frames)
---[NoImage] x264 [info]: slice I:9 Avg QP:17.78 size: 30566
---[NoImage] x264 [info]: slice P:1112 Avg QP:18.96 size: 6143
---[NoImage] x264 [info]: slice B:1036 Avg QP:22.23 size: 1547
---[NoImage] x264 [info]: consecutive B-frames: 15.7% 55.9% 16.8% 6.1% 3.0% 2.5%
---[NoImage] x264 [info]: mb I I16..4: 18.8% 17.9% 63.3%
---[NoImage] x264 [info]: mb P I16..4: 2.8% 3.6% 5.3% P16..4: 30.1% 8.3% 7.9% 0.0% 0.0%skip:41.9%
---[NoImage] x264 [info]: mb B I16..4: 0.4% 0.9% 0.7% B16..8: 17.3% 2.9% 2.9% direct: 3.7% skip:71.3% L0:43.2% L1:45.0% BI:11.8%
---[NoImage] x264 [info]: 8x8 transform intra:31.8% inter:37.4%
---[NoImage] x264 [info]: direct mvs spatial:99.8% temporal:0.2%
---[NoImage] x264 [info]: ref P L0 77.8% 9.9% 6.8% 2.9% 2.7%
---[NoImage] x264 [info]: ref B L0 83.0% 9.3% 5.3% 2.5%
---[NoImage] x264 [info]: ref B L1 94.4% 5.6%
---[NoImage] x264 [info]: kb/s:775.2
---[NoImage] encoded 2157 frames, 24.14 fps, 775.27 kb/s

--------------------------------------------------------------

旧的bf16

--[NoImage] Job commandline: "E:\comic\media\megui\MeGUI\tools\x264\x264.exe" --crf 18.0 --ref 5 --mixed-refs --no-fast-pskip --bframes 16 --b-pyramid --b-rdo --bime --direct auto --filter 1,1 --subme 6 --trellis 2 --partitions p8x8,b8x8,i4x4,i8x8 --8x8dct --me umh --merange 32 --threads auto --thread-input --aq-mode 0 --sar 1:1 --progress --no-dct-decimate --no-psnr --no-ssim --output "E:\avi2.mp4" "E:\avi.avs" --psy-rd 0
---[NoImage] avis [info]: 512x288 @ 24.00 fps (2157 frames)
---[NoImage] x264 [info]: slice I:9 Avg QP:17.22 size: 31409
---[NoImage] x264 [info]: slice P:1319 Avg QP:19.19 size: 5815
---[NoImage] x264 [info]: slice B:829 Avg QP:21.48 size: 1513
---[NoImage] x264 [info]: consecutive B-frames: 37.2% 33.6% 8.2% 13.6% 3.3% 2.5% 1.6% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
---[NoImage] x264 [info]: mb I I16..4: 17.9% 18.6% 63.5%
---[NoImage] x264 [info]: mb P I16..4: 2.8% 3.5% 4.8% P16..4: 29.8% 8.0% 7.7% 0.0% 0.0%skip:43.5%
---[NoImage] x264 [info]: mb B I16..4: 0.2% 0.6% 0.4% B16..8: 17.5% 3.0% 3.1% direct: 4.3% skip:70.8% L0:37.7% L1:49.0% BI:13.3%
---[NoImage] x264 [info]: 8x8 transform intra:32.1% inter:39.0%
---[NoImage] x264 [info]: direct mvs spatial:99.6% temporal:0.4%
---[NoImage] x264 [info]: ref P L0 77.9% 9.9% 6.4% 2.7% 3.0%
---[NoImage] x264 [info]: ref B L0 81.1% 10.0% 5.9% 3.0%
---[NoImage] x264 [info]: ref B L1 96.1% 3.9%
---[NoImage] x264 [info]: kb/s:819.6
---[NoImage] encoded 2157 frames, 26.40 fps, 819.66 kb/s

--------------------------------------------------------------

新的bf16

--[NoImage] Job commandline: "E:\comic\media\megui\MeGUI\tools\x264\x264.exe" --crf 18.0 --ref 5 --mixed-refs --no-fast-pskip --bframes 16 --b-pyramid --b-rdo --bime --direct auto --filter 1,1 --subme 6 --trellis 2 --partitions p8x8,b8x8,i4x4,i8x8 --8x8dct --me umh --merange 32 --threads auto --thread-input --aq-mode 0 --sar 1:1 --progress --no-dct-decimate --no-psnr --no-ssim --output "E:\avi3.mp4" "E:\avi.avs" --psy-rd 0 --b-adapt 2
---[NoImage] avis [info]: 512x288 @ 24.00 fps (2157 frames)
---[NoImage] x264 [info]: slice I:9 Avg QP:17.78 size: 30574
---[NoImage] x264 [info]: slice P:1104 Avg QP:18.96 size: 6161
---[NoImage] x264 [info]: slice B:1044 Avg QP:22.25 size: 1546
---[NoImage] x264 [info]: consecutive B-frames: 15.6% 55.4% 16.6% 6.0% 2.8% 1.1% 0.0% 1.9% 0.0% 0.0% 0.0% 0.0% 0.6% 0.0% 0.0% 0.0% 0.0%
---[NoImage] x264 [info]: mb I I16..4: 18.7% 17.9% 63.3%
---[NoImage] x264 [info]: mb P I16..4: 2.8% 3.6% 5.3% P16..4: 30.2% 8.3% 7.9% 0.0% 0.0%skip:41.9%
---[NoImage] x264 [info]: mb B I16..4: 0.4% 0.9% 0.7% B16..8: 17.3% 3.0% 2.8% direct: 3.7% skip:71.2% L0:43.4% L1:45.0% BI:11.7%
---[NoImage] x264 [info]: 8x8 transform intra:31.5% inter:37.2%
---[NoImage] x264 [info]: direct mvs spatial:99.8% temporal:0.2%
---[NoImage] x264 [info]: ref P L0 78.0% 9.8% 6.6% 2.9% 2.7%
---[NoImage] x264 [info]: ref B L0 82.8% 9.5% 5.3% 2.4%
---[NoImage] x264 [info]: ref B L1 94.3% 5.7%
---[NoImage] x264 [info]: kb/s:773.7
---[NoImage] encoded 2157 frames, 8.82 fps, 773.75 kb/s



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总结，同参数，新的bf在码率上比旧的bf更小，上述试验品少了近50K的码率，对体积控更爽啦。

新旧bf同为5的情况下，新的bf编码速度超越了旧的bf。但是在bf16的情况下，新的bf落后可就不止一点点了。。编码速率下降了3倍之多。

旧bf5和16的码率分别为821 819，差距为3
新bf5和16的码率分别为775 773，差距为2

看来新bf16性价比大大不值的说^_^

看旧的b16那个
consecutive B-frames: 37.2% 33.6% 8.2% 13.6% 3.3% 2.5% 1.6% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%
连续b帧也只到6
新的b16
consecutive B-frames: 15.6% 55.4% 16.6% 6.0% 2.8% 1.1% 0.0% 1.9% 0.0% 0.0% 0.0% 0.0% 0.6% 0.0% 0.0% 0.0% 0.0%
连续b帧最高也是12，7和12中间还有很多是0
看来b16或许是没什么价值
不过最好是找一个静态场景多的片子看看bf能高到多少

consecutive B-frames:
37.2% 33.6% 8.2% 13.6% 3.3% 2.5% 1.6% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0%

分别对应

0 1 2 3 4 ... 16

应该是这样，我猜的[/han]

连续开到3应该够了……