[MEncoder-users] x264 and motion estimation parameters

[Joel Yliluoma]

I noticed that mencoder doesn't allow specifying values for
these x264 parameters:
  --me <string>           Integer pixel motion estimation method ["hex"]
                              - dia: diamond search, radius 1 (fast)
                              - hex: hexagonal search, radius 2
                              - esa: exhaustive search algorithm (slow)
  --merange <integer>     Maximum motion vector search range [16]

So I created a patch that now allows it.
This is a source patch - manual pages were not updated.

The default values in this patch match the default values
in the x264 lib.

--- libmpcodecs/ve_x264.c~      2005-05-09 13:37:50.000000000 +0300
+++ libmpcodecs/ve_x264.c       2005-05-09 13:37:24.000000000 +0300
@@ -96,6 +96,8 @@
 static int level_idc = 40;
 static int psnr = 0;
 static int log_level = 2;
+static int me_method = X264_ME_HEX;
+static int me_range  = 16;

 m_option_t x264encopts_conf[] = {
     {"bitrate", &bitrate, CONF_TYPE_INT, CONF_RANGE, 0, 24000000, NULL},
@@ -146,6 +148,8 @@
     {"psnr", &psnr, CONF_TYPE_FLAG, 0, 0, 1, NULL},
     {"nopsnr", &psnr, CONF_TYPE_FLAG, 0, 1, 0, NULL},
     {"log", &log_level, CONF_TYPE_INT, CONF_RANGE, -1, 3, NULL},
+    {"me", &me_method, CONF_TYPE_INT, CONF_RANGE, 0, 2, NULL},
+    {"mrange", &me_range, CONF_TYPE_INT, CONF_RANGE, 0, 512, NULL},
     {NULL, NULL, 0, 0, 0, 0, NULL}
 };

@@ -185,6 +189,8 @@
     mod->param.rc.f_qblur = qblur;
     mod->param.rc.f_complexity_blur = complexity_blur;
     mod->param.analyse.i_subpel_refine = subq;
+    mod->param.analyse.i_me_range = me_range;
+    mod->param.analyse.i_me_method = me_method;
     mod->param.rc.psz_stat_out = passtmpfile;
     mod->param.rc.psz_stat_in = passtmpfile;
     if((pass & 2) && bitrate <= 0)

Also available at address:
  http://bisqwit.iki.fi/src/mencoder-x264-me-patch.txt

-- 
Joel Yliluoma
http://iki.fi/bisqwit/