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sync to x264 rev264 (lossless) 

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@15745 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
lorenm 2005-06-17 08:26:12 +00:00
parent 8193073010
commit 8348626c8f
2 changed files with 3 additions and 2 deletions
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3
DOCS/man/en/mplayer.1
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@ -7851,11 +7851,12 @@ Constant bitrate can be achieved by combining this with vbv_maxrate,
at significant reduction in quality.
.
.TP
.B qp_constant=<1\-51>
.B qp_constant=<0\-51>
This selects the quantizer to use for P-frames.
I- and B-frames are offset from this value by ip_factor and pb_factor, respectively.
20\-40 is a useful range (default: 26).
Lower values result in better fidelity, but higher bitrates.
0 is lossless.
Note that quantization in H.264 works differently from MPEG-1/2/4:
H.264's quantization parameter (QP) is on a logarithmic scale.
The mapping is approximately H264QP = 12 + 6*log2(MPEGQP).

2
libmpcodecs/ve_x264.c
View File

@ -107,7 +107,7 @@ static int log_level = 2;
m_option_t x264encopts_conf[] = {
{"bitrate", &bitrate, CONF_TYPE_INT, CONF_RANGE, 0, 24000000, NULL},
{"qp_constant", &qp_constant, CONF_TYPE_INT, CONF_RANGE, 1, 51, NULL},
{"qp_constant", &qp_constant, CONF_TYPE_INT, CONF_RANGE, 0, 51, NULL},
{"frameref", &frame_ref, CONF_TYPE_INT, CONF_RANGE, 1, 16, NULL},
{"keyint", &keyint_max, CONF_TYPE_INT, CONF_RANGE, 1, 24000000, NULL},
{"keyint_min", &keyint_min, CONF_TYPE_INT, CONF_RANGE, 1, 24000000, NULL},