robert-swains-computer:~ rob$ x264 --crf 20 --sar 4:3 -o test.h264 samples/raw/foreman_cif.y4m 
yuv4mpeg: 352x288@30000/1001fps, 128:117
x264 [info]: using SAR=128/117
x264 [info]: using cpu capabilities MMX MMXEXT SSE SSE2 
x264 [info]: slice I:2     Avg QP:18.50  size: 28240  PSNR Mean Y:43.67 U:45.63 V:46.99 Avg:44.37 Global:44.05
x264 [info]: slice P:298   Avg QP:22.94  size:  4369  PSNR Mean Y:39.71 U:42.55 V:44.58 Avg:40.63 Global:40.47
x264 [info]: mb I  I16..4:  6.8%  0.0% 93.2%
x264 [info]: mb P  I16..4:  2.1%  0.0%  2.7%  P16..4: 40.7% 32.1% 11.4%  0.0%  0.0%    skip:11.0%
x264 [info]: SSIM Mean Y:0.9686630
x264 [info]: PSNR Mean Y:39.739 U:42.571 V:44.601 Avg:40.652 Global:40.486 kb/s:1085.58

encoded 300 frames, 36.18 fps, 1086.02 kb/s
robert-swains-computer:~ rob$ x264 --crf 20 -o test.h264 samples/raw/foreman_cif.y4m 
yuv4mpeg: 352x288@30000/1001fps, 128:117
x264 [info]: using SAR=128/117
x264 [info]: using cpu capabilities MMX MMXEXT SSE SSE2 
x264 [info]: slice I:2     Avg QP:18.50  size: 28240  PSNR Mean Y:43.67 U:45.63 V:46.99 Avg:44.37 Global:44.05
x264 [info]: slice P:298   Avg QP:22.94  size:  4369  PSNR Mean Y:39.71 U:42.55 V:44.58 Avg:40.63 Global:40.47
x264 [info]: mb I  I16..4:  6.8%  0.0% 93.2%
x264 [info]: mb P  I16..4:  2.1%  0.0%  2.7%  P16..4: 40.7% 32.1% 11.4%  0.0%  0.0%    skip:11.0%
x264 [info]: SSIM Mean Y:0.9686630
x264 [info]: PSNR Mean Y:39.739 U:42.571 V:44.601 Avg:40.652 Global:40.486 kb/s:1085.58

encoded 300 frames, 33.70 fps, 1086.02 kb/s