From 8348626c8f3a0308703846edb8d20ae4600fd77e Mon Sep 17 00:00:00 2001 From: lorenm Date: Fri, 17 Jun 2005 08:26:12 +0000 Subject: sync to x264 rev264 (lossless) git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@15745 b3059339-0415-0410-9bf9-f77b7e298cf2 --- DOCS/man/en/mplayer.1 | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'DOCS/man') diff --git a/DOCS/man/en/mplayer.1 b/DOCS/man/en/mplayer.1 index 7bd8da6238..72caccb199 100644 --- a/DOCS/man/en/mplayer.1 +++ b/DOCS/man/en/mplayer.1 @@ -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). -- cgit v1.2.3