经常在论坛上看到大家讨论某个参数的时候贴出诸如此类的压缩日志：
x264 [info]: slice I:249 Avg QP:22.44 size: 24027 PSNR Mean Y:48.09 U:51.08 V:51.83 Avg:48.63 Global:46.01
x264 [info]: slice P:15110 Avg QP:24.45 size: 5654 PSNR Mean Y:44.18 U:46.74 V:47.65 Avg:44.90 Global:42.80
x264 [info]: slice B:20016 Avg QP:25.84 size: 1171 PSNR Mean Y:44.08 U:46.83 V:47.81 Avg:44.85 Global:42.85
x264 [info]: consecutive B-frames: 11.7% 34.9% 13.4% 33.3% 1.6% 1.1% 4.0%
x264 [info]: mb I I16..4: 35.4% 30.4% 34.1%
x264 [info]: mb P I16..4: 10.5% 10.4% 3.0% P16..4: 31.5% 6.7% 4.1% 0.0% 0.0%skip:33.7%
x264 [info]: mb B I16..4: 1.2% 1.8% 0.2% B16..8: 17.5% 0.8% 0.8% direct: 1.7% skip:76.0% L0:41.8% L1:52.5% BI: 5.8%
x264 [info]: 8x8 transform intra:44.6% inter:65.7%
x264 [info]: direct mvs spatial:99.3% temporal:0.7%
x264 [info]: ref P L0 72.1% 10.8% 8.6% 4.4% 4.1%
x264 [info]: ref B L0 77.4% 11.4% 7.2% 4.0%
x264 [info]: ref B L1 93.9% 6.1%
x264 [info]: SSIM Mean Y:0.9865696
x264 [info]: PSNR Mean Y:44.155 U:46.822 V:47.769 Avg:44.899 Global:42.848 kb/s:778.43
encoded 793 frames, 7.25 fps, 798.89 kb/s
参数很多，看得很头痛，不知这里面哪些参数是关键性的参数？哪些跟码率有关，哪些跟速度有关，哪些跟画质有关？总而言之，就是说，应该怎么分析这个log呢？
