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Diffstat (limited to 'DOCS/man/en/mplayer.1')
| -rw-r--r-- | DOCS/man/en/mplayer.1 | 3 |
1 files changed, 2 insertions, 1 deletions
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). |