序，是这个情况，4681 kbps
x264 [info]: frame I:1359 Avg QP:16.58 size:120138
x264 [info]: frame P:38327 Avg QP:17.64 size: 49102
x264 [info]: frame B:105526 Avg QP:22.82 size: 15323
Re: 请教一下，x264的B帧质量问题
x264 [info]: frame I:17 Avg QP: 8.10 size:256454
x264 [info]: frame P:244 Avg QP:11.82 size: 48520
x264 [info]: frame B:740 Avg QP:14.28 size: 7688
或
x264 [info]: frame I:17 Avg QP: 8.18 size:252623
x264 [info]: frame P:244 Avg QP:11.78 size: 47533
x264 [info]: frame B:740 Avg QP:13.66 size: 8042
或
x264 [info]: frame I:17 Avg QP: 8.44 size:243914
x264 [info]: frame P:244 Avg QP:11.80 size: 45874
x264 [info]: frame B:740 Avg QP:12.96 size: 8824
动画片截取1000帧，参数差别在aq strength，1.0、1.2、1.5
牺牲I质量提高B，值得么？
x264 [info]: frame P:244 Avg QP:11.82 size: 48520
x264 [info]: frame B:740 Avg QP:14.28 size: 7688
或
x264 [info]: frame I:17 Avg QP: 8.18 size:252623
x264 [info]: frame P:244 Avg QP:11.78 size: 47533
x264 [info]: frame B:740 Avg QP:13.66 size: 8042
或
x264 [info]: frame I:17 Avg QP: 8.44 size:243914
x264 [info]: frame P:244 Avg QP:11.80 size: 45874
x264 [info]: frame B:740 Avg QP:12.96 size: 8824
动画片截取1000帧，参数差别在aq strength，1.0、1.2、1.5
牺牲I质量提高B，值得么？
Re: 请教一下，x264的B帧质量问题
AQ的作用是不同块之间码率分配的改变
比如一帧一共4个块 CQP模式出来是 10，10，10，10
同样码率，你用了某个aq变成 8， 12，8，16
前者avgqp是10，后者是11，能否说明前者质量比后者高呢？ 更何况你比较的对象是所有b帧和所有i帧
你要比较质量就自已想办法分析，无论是截图用眼睛看，静态用眼睛看，动态用眼睛看，看看ssim什么的也比这样分析averageQP靠谱
比如一帧一共4个块 CQP模式出来是 10，10，10，10
同样码率，你用了某个aq变成 8， 12，8，16
前者avgqp是10，后者是11，能否说明前者质量比后者高呢？ 更何况你比较的对象是所有b帧和所有i帧
你要比较质量就自已想办法分析，无论是截图用眼睛看，静态用眼睛看，动态用眼睛看，看看ssim什么的也比这样分析averageQP靠谱
Re: 请教一下，x264的B帧质量问题
AQ的作用可以用AQDebug看
Re: 请教一下，x264的B帧质量问题
加参数，重压一次，麻烦各位再看下
---[NoImage] x264 [info]: using SAR=1/1
---[NoImage] x264 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2
---[NoImage] x264 [info]: profile High, level 4.1
---[NoImage]
---[NoImage] x264 [info]: frame I:17 Avg QP: 8.10 size:256454 PSNR Mean Y:51.74 U:53.51 V:53.60 Avg:52.26 Global:52.10
---[NoImage] x264 [info]: frame P:244 Avg QP:11.82 size: 48520 PSNR Mean Y:49.55 U:51.48 V:51.63 Avg:50.11 Global:49.98
---[NoImage] x264 [info]: frame B:740 Avg QP:14.28 size: 7688 PSNR Mean Y:49.12 U:51.45 V:51.60 Avg:49.78 Global:49.64
---[NoImage] x264 [info]: consecutive B-frames: 2.6% 4.1% 4.9% 58.1% 5.6% 3.7% 0.7% 12.2% 0.9% 0.0% 1.1% 1.2% 0.0% 0.0% 0.0% 4.9% 0.0%
---[NoImage] x264 [info]: mb I I16..4: 7.2% 48.9% 44.0%
---[NoImage] x264 [info]: mb P I16..4: 0.8% 5.0% 2.9% P16..4: 48.5% 17.0% 11.9% 1.1% 1.0% skip:11.7%
---[NoImage] x264 [info]: mb B I16..4: 0.0% 0.2% 0.2% B16..8: 28.3% 6.8% 2.4% direct: 1.9% skip:60.1% L0:50.9% L1:44.7% BI: 4.4%
---[NoImage] x264 [info]: 8x8 transform intra:53.6% inter:28.1%
---[NoImage] x264 [info]: direct mvs spatial:98.4% temporal:1.6%
---[NoImage] x264 [info]: coded y,uvDC,uvAC intra: 85.5% 84.9% 79.2% inter: 17.1% 11.0% 6.7%
---[NoImage] x264 [info]: i16 v,h,dc,p: 25% 19% 19% 36%
---[NoImage] x264 [info]: i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 10% 9% 11% 9% 9% 10% 12% 13%
---[NoImage] x264 [info]: i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 9% 7% 12% 12% 10% 11% 11% 13%
---[NoImage] x264 [info]: i8c dc,h,v,p: 48% 22% 21% 9%
---[NoImage] x264 [info]: Weighted P-Frames: Y:0.0% UV:0.0%
---[NoImage] x264 [info]: ref P L0: 54.0% 2.0% 17.3% 7.2% 5.4% 4.8% 4.1% 2.3% 2.6% 0.3%
---[NoImage] x264 [info]: ref B L0: 66.9% 14.6% 7.9% 3.6% 2.8% 2.2% 1.4% 0.5%
---[NoImage] x264 [info]: ref B L1: 91.6% 8.4%
---[NoImage] x264 [info]: SSIM Mean Y:0.9932221 (21.689db)
---[NoImage] x264 [info]: PSNR Mean Y:49.268 U:51.489 V:51.643 Avg:49.901 Global:49.753 kb/s:4194.09
---[NoImage] avs [info]: 1280x692p 1:1 @ 24000/1001 fps (cfr)
---[NoImage] x264 [info]: using SAR=1/1
---[NoImage] x264 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2
---[NoImage] x264 [info]: profile High, level 4.1
---[NoImage]
---[NoImage] x264 [info]: frame I:17 Avg QP: 8.18 size:252623 PSNR Mean Y:51.45 U:53.23 V:53.33 Avg:51.97 Global:51.79
---[NoImage] x264 [info]: frame P:244 Avg QP:11.78 size: 47533 PSNR Mean Y:49.27 U:51.19 V:51.35 Avg:49.84 Global:49.68
---[NoImage] x264 [info]: frame B:740 Avg QP:13.66 size: 8042 PSNR Mean Y:48.89 U:51.19 V:51.35 Avg:49.54 Global:49.38
---[NoImage] x264 [info]: consecutive B-frames: 2.6% 4.1% 4.9% 58.1% 5.6% 3.7% 0.7% 12.2% 0.9% 0.0% 1.1% 1.2% 0.0% 0.0% 0.0% 4.9% 0.0%
---[NoImage] x264 [info]: mb I I16..4: 7.1% 48.9% 43.9%
---[NoImage] x264 [info]: mb P I16..4: 0.7% 5.1% 3.0% P16..4: 47.3% 17.5% 11.7% 1.1% 1.0% skip:12.7%
---[NoImage] x264 [info]: mb B I16..4: 0.0% 0.2% 0.2% B16..8: 27.2% 7.7% 2.6% direct: 2.3% skip:59.7% L0:51.2% L1:44.3% BI: 4.4%
---[NoImage] x264 [info]: 8x8 transform intra:54.3% inter:27.3%
---[NoImage] x264 [info]: direct mvs spatial:98.5% temporal:1.5%
---[NoImage] x264 [info]: coded y,uvDC,uvAC intra: 87.1% 86.5% 81.4% inter: 18.4% 11.0% 6.6%
---[NoImage] x264 [info]: i16 v,h,dc,p: 22% 18% 22% 39%
---[NoImage] x264 [info]: i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 10% 9% 10% 9% 9% 10% 12% 13%
---[NoImage] x264 [info]: i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 9% 7% 12% 12% 10% 11% 11% 13%
---[NoImage] x264 [info]: i8c dc,h,v,p: 48% 22% 21% 9%
---[NoImage] x264 [info]: Weighted P-Frames: Y:0.0% UV:0.0%
---[NoImage] x264 [info]: ref P L0: 53.9% 2.0% 17.3% 7.3% 5.4% 4.8% 4.1% 2.3% 2.6% 0.3%
---[NoImage] x264 [info]: ref B L0: 66.6% 14.7% 8.0% 3.6% 2.9% 2.3% 1.5% 0.5%
---[NoImage] x264 [info]: ref B L1: 91.5% 8.5%
---[NoImage] x264 [info]: SSIM Mean Y:0.9931340 (21.633db)
---[NoImage] x264 [info]: PSNR Mean Y:49.026 U:51.227 V:51.384 Avg:49.656 Global:49.480 kb/s:4185.59
---[NoImage] encoded 1001 frames, 14.97 fps, 4185.73 kb/s
---[NoImage] avs [info]: 1280x692p 1:1 @ 24000/1001 fps (cfr)
---[NoImage] x264 [info]: using SAR=1/1
---[NoImage] x264 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2
---[NoImage] x264 [info]: profile High, level 4.1
---[NoImage]
---[NoImage] x264 [info]: frame I:17 Avg QP: 8.44 size:243914 PSNR Mean Y:50.86 U:52.65 V:52.77 Avg:51.39 Global:51.17
---[NoImage] x264 [info]: frame P:244 Avg QP:11.80 size: 45874 PSNR Mean Y:48.73 U:50.66 V:50.85 Avg:49.30 Global:49.09
---[NoImage] x264 [info]: frame B:740 Avg QP:12.96 size: 8824 PSNR Mean Y:48.43 U:50.71 V:50.89 Avg:49.08 Global:48.86
---[NoImage] x264 [info]: consecutive B-frames: 2.6% 4.1% 4.9% 58.1% 5.6% 3.7% 0.7% 12.2% 0.9% 0.0% 1.1% 1.2% 0.0% 0.0% 0.0% 4.9% 0.0%
---[NoImage] x264 [info]: mb I I16..4: 6.7% 49.8% 43.5%
---[NoImage] x264 [info]: mb P I16..4: 0.6% 5.4% 3.1% P16..4: 44.9% 17.8% 11.3% 0.9% 0.9% skip:15.1%
---[NoImage] x264 [info]: mb B I16..4: 0.0% 0.3% 0.2% B16..8: 25.6% 8.6% 3.0% direct: 3.0% skip:59.4% L0:51.5% L1:43.7% BI: 4.7%
---[NoImage] x264 [info]: 8x8 transform intra:55.3% inter:24.7%
---[NoImage] x264 [info]: direct mvs spatial:98.5% temporal:1.5%
---[NoImage] x264 [info]: coded y,uvDC,uvAC intra: 88.4% 88.2% 83.7% inter: 20.6% 11.4% 6.5%
---[NoImage] x264 [info]: i16 v,h,dc,p: 20% 17% 24% 39%
---[NoImage] x264 [info]: i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 11% 10% 10% 9% 9% 10% 12% 13%
---[NoImage] x264 [info]: i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 9% 7% 12% 12% 10% 11% 11% 12%
---[NoImage] x264 [info]: i8c dc,h,v,p: 49% 21% 21% 9%
---[NoImage] x264 [info]: Weighted P-Frames: Y:0.0% UV:0.0%
---[NoImage] x264 [info]: ref P L0: 53.7% 2.1% 17.2% 7.4% 5.5% 4.9% 4.1% 2.4% 2.5% 0.3%
---[NoImage] x264 [info]: ref B L0: 66.2% 14.8% 8.1% 3.7% 3.0% 2.4% 1.4% 0.5%
---[NoImage] x264 [info]: ref B L1: 91.0% 9.0%
---[NoImage] x264 [info]: SSIM Mean Y:0.9929036 (21.490db)
---[NoImage] x264 [info]: PSNR Mean Y:48.549 U:50.728 V:50.916 Avg:49.177 Global:48.948 kb/s:4190.61
---[NoImage] encoded 1001 frames, 14.72 fps, 4190.75 kb/s
---[NoImage] x264 [info]: using SAR=1/1
---[NoImage] x264 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2
---[NoImage] x264 [info]: profile High, level 4.1
---[NoImage]
---[NoImage] x264 [info]: frame I:17 Avg QP: 8.10 size:256454 PSNR Mean Y:51.74 U:53.51 V:53.60 Avg:52.26 Global:52.10
---[NoImage] x264 [info]: frame P:244 Avg QP:11.82 size: 48520 PSNR Mean Y:49.55 U:51.48 V:51.63 Avg:50.11 Global:49.98
---[NoImage] x264 [info]: frame B:740 Avg QP:14.28 size: 7688 PSNR Mean Y:49.12 U:51.45 V:51.60 Avg:49.78 Global:49.64
---[NoImage] x264 [info]: consecutive B-frames: 2.6% 4.1% 4.9% 58.1% 5.6% 3.7% 0.7% 12.2% 0.9% 0.0% 1.1% 1.2% 0.0% 0.0% 0.0% 4.9% 0.0%
---[NoImage] x264 [info]: mb I I16..4: 7.2% 48.9% 44.0%
---[NoImage] x264 [info]: mb P I16..4: 0.8% 5.0% 2.9% P16..4: 48.5% 17.0% 11.9% 1.1% 1.0% skip:11.7%
---[NoImage] x264 [info]: mb B I16..4: 0.0% 0.2% 0.2% B16..8: 28.3% 6.8% 2.4% direct: 1.9% skip:60.1% L0:50.9% L1:44.7% BI: 4.4%
---[NoImage] x264 [info]: 8x8 transform intra:53.6% inter:28.1%
---[NoImage] x264 [info]: direct mvs spatial:98.4% temporal:1.6%
---[NoImage] x264 [info]: coded y,uvDC,uvAC intra: 85.5% 84.9% 79.2% inter: 17.1% 11.0% 6.7%
---[NoImage] x264 [info]: i16 v,h,dc,p: 25% 19% 19% 36%
---[NoImage] x264 [info]: i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 10% 9% 11% 9% 9% 10% 12% 13%
---[NoImage] x264 [info]: i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 9% 7% 12% 12% 10% 11% 11% 13%
---[NoImage] x264 [info]: i8c dc,h,v,p: 48% 22% 21% 9%
---[NoImage] x264 [info]: Weighted P-Frames: Y:0.0% UV:0.0%
---[NoImage] x264 [info]: ref P L0: 54.0% 2.0% 17.3% 7.2% 5.4% 4.8% 4.1% 2.3% 2.6% 0.3%
---[NoImage] x264 [info]: ref B L0: 66.9% 14.6% 7.9% 3.6% 2.8% 2.2% 1.4% 0.5%
---[NoImage] x264 [info]: ref B L1: 91.6% 8.4%
---[NoImage] x264 [info]: SSIM Mean Y:0.9932221 (21.689db)
---[NoImage] x264 [info]: PSNR Mean Y:49.268 U:51.489 V:51.643 Avg:49.901 Global:49.753 kb/s:4194.09
---[NoImage] avs [info]: 1280x692p 1:1 @ 24000/1001 fps (cfr)
---[NoImage] x264 [info]: using SAR=1/1
---[NoImage] x264 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2
---[NoImage] x264 [info]: profile High, level 4.1
---[NoImage]
---[NoImage] x264 [info]: frame I:17 Avg QP: 8.18 size:252623 PSNR Mean Y:51.45 U:53.23 V:53.33 Avg:51.97 Global:51.79
---[NoImage] x264 [info]: frame P:244 Avg QP:11.78 size: 47533 PSNR Mean Y:49.27 U:51.19 V:51.35 Avg:49.84 Global:49.68
---[NoImage] x264 [info]: frame B:740 Avg QP:13.66 size: 8042 PSNR Mean Y:48.89 U:51.19 V:51.35 Avg:49.54 Global:49.38
---[NoImage] x264 [info]: consecutive B-frames: 2.6% 4.1% 4.9% 58.1% 5.6% 3.7% 0.7% 12.2% 0.9% 0.0% 1.1% 1.2% 0.0% 0.0% 0.0% 4.9% 0.0%
---[NoImage] x264 [info]: mb I I16..4: 7.1% 48.9% 43.9%
---[NoImage] x264 [info]: mb P I16..4: 0.7% 5.1% 3.0% P16..4: 47.3% 17.5% 11.7% 1.1% 1.0% skip:12.7%
---[NoImage] x264 [info]: mb B I16..4: 0.0% 0.2% 0.2% B16..8: 27.2% 7.7% 2.6% direct: 2.3% skip:59.7% L0:51.2% L1:44.3% BI: 4.4%
---[NoImage] x264 [info]: 8x8 transform intra:54.3% inter:27.3%
---[NoImage] x264 [info]: direct mvs spatial:98.5% temporal:1.5%
---[NoImage] x264 [info]: coded y,uvDC,uvAC intra: 87.1% 86.5% 81.4% inter: 18.4% 11.0% 6.6%
---[NoImage] x264 [info]: i16 v,h,dc,p: 22% 18% 22% 39%
---[NoImage] x264 [info]: i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 10% 9% 10% 9% 9% 10% 12% 13%
---[NoImage] x264 [info]: i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 9% 7% 12% 12% 10% 11% 11% 13%
---[NoImage] x264 [info]: i8c dc,h,v,p: 48% 22% 21% 9%
---[NoImage] x264 [info]: Weighted P-Frames: Y:0.0% UV:0.0%
---[NoImage] x264 [info]: ref P L0: 53.9% 2.0% 17.3% 7.3% 5.4% 4.8% 4.1% 2.3% 2.6% 0.3%
---[NoImage] x264 [info]: ref B L0: 66.6% 14.7% 8.0% 3.6% 2.9% 2.3% 1.5% 0.5%
---[NoImage] x264 [info]: ref B L1: 91.5% 8.5%
---[NoImage] x264 [info]: SSIM Mean Y:0.9931340 (21.633db)
---[NoImage] x264 [info]: PSNR Mean Y:49.026 U:51.227 V:51.384 Avg:49.656 Global:49.480 kb/s:4185.59
---[NoImage] encoded 1001 frames, 14.97 fps, 4185.73 kb/s
---[NoImage] avs [info]: 1280x692p 1:1 @ 24000/1001 fps (cfr)
---[NoImage] x264 [info]: using SAR=1/1
---[NoImage] x264 [info]: using cpu capabilities: MMX2 SSE2Fast SSSE3 FastShuffle SSE4.2
---[NoImage] x264 [info]: profile High, level 4.1
---[NoImage]
---[NoImage] x264 [info]: frame I:17 Avg QP: 8.44 size:243914 PSNR Mean Y:50.86 U:52.65 V:52.77 Avg:51.39 Global:51.17
---[NoImage] x264 [info]: frame P:244 Avg QP:11.80 size: 45874 PSNR Mean Y:48.73 U:50.66 V:50.85 Avg:49.30 Global:49.09
---[NoImage] x264 [info]: frame B:740 Avg QP:12.96 size: 8824 PSNR Mean Y:48.43 U:50.71 V:50.89 Avg:49.08 Global:48.86
---[NoImage] x264 [info]: consecutive B-frames: 2.6% 4.1% 4.9% 58.1% 5.6% 3.7% 0.7% 12.2% 0.9% 0.0% 1.1% 1.2% 0.0% 0.0% 0.0% 4.9% 0.0%
---[NoImage] x264 [info]: mb I I16..4: 6.7% 49.8% 43.5%
---[NoImage] x264 [info]: mb P I16..4: 0.6% 5.4% 3.1% P16..4: 44.9% 17.8% 11.3% 0.9% 0.9% skip:15.1%
---[NoImage] x264 [info]: mb B I16..4: 0.0% 0.3% 0.2% B16..8: 25.6% 8.6% 3.0% direct: 3.0% skip:59.4% L0:51.5% L1:43.7% BI: 4.7%
---[NoImage] x264 [info]: 8x8 transform intra:55.3% inter:24.7%
---[NoImage] x264 [info]: direct mvs spatial:98.5% temporal:1.5%
---[NoImage] x264 [info]: coded y,uvDC,uvAC intra: 88.4% 88.2% 83.7% inter: 20.6% 11.4% 6.5%
---[NoImage] x264 [info]: i16 v,h,dc,p: 20% 17% 24% 39%
---[NoImage] x264 [info]: i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 11% 10% 10% 9% 9% 10% 12% 13%
---[NoImage] x264 [info]: i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 9% 7% 12% 12% 10% 11% 11% 12%
---[NoImage] x264 [info]: i8c dc,h,v,p: 49% 21% 21% 9%
---[NoImage] x264 [info]: Weighted P-Frames: Y:0.0% UV:0.0%
---[NoImage] x264 [info]: ref P L0: 53.7% 2.1% 17.2% 7.4% 5.5% 4.9% 4.1% 2.4% 2.5% 0.3%
---[NoImage] x264 [info]: ref B L0: 66.2% 14.8% 8.1% 3.7% 3.0% 2.4% 1.4% 0.5%
---[NoImage] x264 [info]: ref B L1: 91.0% 9.0%
---[NoImage] x264 [info]: SSIM Mean Y:0.9929036 (21.490db)
---[NoImage] x264 [info]: PSNR Mean Y:48.549 U:50.728 V:50.916 Avg:49.177 Global:48.948 kb/s:4190.61
---[NoImage] encoded 1001 frames, 14.72 fps, 4190.75 kb/s