ffmpeg使用x264编码的配置（二）

 下面举几个x264编码的例子：

 

我使用mencoder调用x264编码一个psp用的视频：

x264+aac in mp4 (我修改过的，原作者的不能使用)
mencoder test_video.vob -oac lavc -lavcopts acodec=libfaac:abitrate=94 -ovc x264 -x264encopts\
cabac=1:ref=1:deblock=1,0,0:analyse=0x1,0x111:me=hex:subme=6:psy_rd=1.0,0.0:mixed_refs=0:me_range=32:chroma_me=1:trellis=1:8x\
8dct=0:no-chroma-me=0:chroma_qp_offset=-\
2:nr=0:dct_decimate=1:bframes=3:b_pyramid=0:b_adapt=1:b_bias=0:direct=3:keyint=250:keyint_min=25:scenecut=40:qp=18:bitrate=80\
0 -lavdopts er=2 -of lavf -lavfopts format=mp4 -vf scale=720:480 -o men.mp4 

对应的ffmpeg编码参数是：

ffmpeg
ffmpeg -i inputfile.avi -f psp -acodec libfaac -ab 94k -vcodec libx264 -cqp 28 -coder 1 -refs 3 -deblockalpha 1 -deblockbeta -1 -me_method umh -subq 9 -me_range 32 -trellis 2 -chromaoffset -2 -nr 0 -bf 2 -b_strategy 1 -bframebias 0 -directpred 3 -g 250 -i_qfactor 1.3 -b_qfactor 1.4 -flags2 +bpyramid+wpred+mixed_refs+8x8dct -er 2 -s 480x320

需要注意的是,flags2里面那块,似乎要按照一定顺序才能正常工作,其他地方都差不多,详细情况可以从下面两篇文章得出:

第一篇是这个在网上被传了很多,但有些问题的对照表格,我修改了有问题的部分:

FFmpeg option	x264 option
-g <frames>	–keyint
-b <bits per second>	–bitrate
-bufsize <bits>	–vbv-bufsize
-maxrate <bits>	–vbv-maxrate
-pass <1,2,3>	–pass
-crf <float>	–crf
-cqp <int>	–qp
-bf <int>	–bframes
-coder <0,1>	–no-cabac
-bframebias <int>	–b-bias
-keyint_min <int>	–min-keyint
-sc_threshold <int>	–scenecut
-deblockalpha <int>-deblockbeta <int>	–deblock
-qmin <int>	–qpmin
-qmax <int>	–qpmax
-qdiff <int>	–qpstep
-qcomp <float>	–qcomp
-qblur <float>	–qblur
-complexityblur <float>	–cplxblur
-refs <int>	–ref
-directpred <int>	–direct
-me_method <epzs,hex,umh,full>	–me
-me_range <int>	–merange
-subq <int>	–subme
-bidir_refine <0,1>	–bime
-trellis <0,1,2>	–trellis
-nr <int>	–nr
-level <int>	–level
-bt <bits>	–ratetol = -bt / -b
-rc_init_occupancy <bits>	–vbv-init = -rc_init_occupancy / -bufsize
-i_qfactor <float>	–ipratio = 1 / -i_qfactor
-b_qfactor <float>	–pbratio
-chromaoffset <int>	–chroma-qp-offset
-rc_eq <string>	–rc_eq
-threads <int>	–threads
-cmp <-chroma/+chroma>	–no-chroma-me
-partitions	–partitions
+parti8×8	i8×8
+parti4×4	i4×4
+partp8×8	p8×8
+partp4×4	p4×4
+partb8×8	b8×8
-flags
-loop/+loop	–no-deblock/–deblock
-psnr/+psnr	–no-psnr/nothing
-flags2
+bpyramid	–b-pyramid
+wpred	–weightb
+brdo	–b-rdo 我这里的ffmpeg已经不能用这个了
+mixed_refs	–mixed-refs
+dct8×8	–8×8dct
-fastpskip/+fastpskip	–no-fast-pskip
+aud	–aud