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clarify a few things about the interaction between *cmp and mbd options

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fix encoding example that featured a option that didn't have any effect (because of the interaction mentioned above)


git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@21848 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
gpoirier 2007-01-07 10:39:00 +00:00
parent aee88f659d
commit 2abf85b1df
2 changed files with 13 additions and 6 deletions
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13
DOCS/man/en/mplayer.1
View File

@ -7304,14 +7304,20 @@ so quality may be low.
motion estimation search range (default: 0 (unlimited))
.
.TP
.B mbd=<0\-2>
.B mbd=<0\-2> (see also *cmp, qpel)
Macroblock decision algorithm (high quality mode), encode each macro
block in all modes and choose the best.
This is slow but results in better quality and file size.
When mbd is set to 1 or 2, the value of mbcmp is ignored when comparing
macroblocks.
If any comparison setting (precmp, subcmp, cmp, or mbcmp) is nonzero,
however, a slower but better half-pel motion search will be used,
regardless of what mbd is set to.
If qpel is set, quarter-pel motion search will be used regardless.
.PD 0
.RSs
.IPs 0
Use mbcmp (default).
Use comparison function given by mbcmp (default).
.IPs 1
Select the MB mode which needs the fewest bits (=vhq).
.IPs 2
@ -8118,7 +8124,8 @@ This seems only useful for high bitrate encodings.
.
.TP
.B mbcmp=<0\-2000>
Sets the comparison function for the macroblock decision, only used if mbd=0.
Sets the comparison function for the macroblock decision, has only
an effect if mbd=0.
.PD 0
.RSs
.IPs "0 (SAD)"

6
DOCS/xml/en/encoding-guide.xml
View File

@ -2953,13 +2953,13 @@ amounts of detail, so we pick 2400Kbit for our bitrate.
We are now ready to do the two pass encode. Pass one:
<screen>
mencoder dvd://1 -ofps 24000/1001 -oac copy -o <replaceable>Harry_Potter_2.avi</replaceable> -ovc lavc \
-lavcopts vcodec=mpeg4:vbitrate=2400:v4mv:mbd=2:trell:cmp=3:subcmp=3:mbcmp=3:autoaspect:vpass=1 \
-lavcopts vcodec=mpeg4:vbitrate=2400:v4mv:mbd=2:trell:cmp=3:subcmp=3:autoaspect:vpass=1 \
-vf pullup,softskip,crop=720:352:0:62,hqdn3d=2:1:2
</screen>
And pass two is the same, except that we specify <option>vpass=2</option>:
<screen>
mencoder dvd://1 -ofps 24000/1001 -oac copy -o <replaceable>Harry_Potter_2.avi</replaceable> -ovc lavc \
-lavcopts vcodec=mpeg4:vbitrate=2400:v4mv:mbd=2:trell:cmp=3:subcmp=3:mbcmp=3:autoaspect:vpass=2 \
-lavcopts vcodec=mpeg4:vbitrate=2400:v4mv:mbd=2:trell:cmp=3:subcmp=3:autoaspect:vpass=2 \
-vf pullup,softskip,crop=720:352:0:62,hqdn3d=2:1:2
</screen>
</para>
@ -2968,7 +2968,7 @@ mencoder dvd://1 -ofps 24000/1001 -oac copy -o <replaceable>Harry_Potter_2.avi</
The options <option>v4mv:mbd=2:trell</option> will greatly increase the
quality at the expense of encoding time. There is little reason to leave
these options out when the primary goal is quality. The options
<option>cmp=3:subcmp=3:mbcmp=3</option> select a comparison function that
<option>cmp=3:subcmp=3</option> select a comparison function that
yields higher quality than the defaults. You might try experimenting with
this parameter (refer to the man page for the possible values) as
different functions can have a large impact on quality depending on the