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Diffstat (limited to 'DOCS/man/en/mplayer.1')
| -rw-r--r-- | DOCS/man/en/mplayer.1 | 25 |
1 files changed, 19 insertions, 6 deletions
diff --git a/DOCS/man/en/mplayer.1 b/DOCS/man/en/mplayer.1 index 7eeb6b656a..7336162d19 100644 --- a/DOCS/man/en/mplayer.1 +++ b/DOCS/man/en/mplayer.1 @@ -7062,11 +7062,11 @@ 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. -Note that quantization in H.264 works differently from MPEG-[124]. +Note that quantization in H.264 works differently from MPEG-1/2/4. H.264's quantization parameter (QP) is on a logarithmic scale. As an example, the bitrate difference between QP=20 and QP=40 is about a factor of 10. -Useful quantizers in H.264 tend to be very large compared to MPEG-[124]. +Useful quantizers in H.264 tend to be very large compared to MPEG-1/2/4. . .TP .B pass=<1\-3> @@ -7118,13 +7118,17 @@ both fast and provide good quality. . .TP .B keyint=<value> -Sets maximum interval between I-frames. +Sets maximum interval between IDR-frames (default: 250). Larger values save bits, thus improve quality, at the cost of seeking -precision (default: 250). +precision. +Unlike MPEG-1/2/4, H.264 does not suffer from DCT drift with large +values of keyint. . .TP -.B idrint=<value> -Make each <value> I-frame an IDR-frame (default: 2). +.B keyint_min=<1\-keyint/2> +Sets minimum interval between IDR-frames (default: keyint * 0.4). +If scenecuts appear within this interval, they are still encoded as +I-frames, but do not start a new GOP. In H.264, I-frames do not necessarily bound a closed GOP because it is allowable for a P-frame to be predicted from more frames than just the one frame before it (also see frameref). @@ -7290,10 +7294,19 @@ i16x16, i4x4, b16x16, skip, direct. See 4x4mv for details. . .TP +.B (no)8x8mv +Use additional macroblock types p16x8, p8x16, p8x8 (default: enabled). +Without this option, P-frames will use only types +i16x16, i4x4, p16x16, skip. +This option is provided for experimentation only. +It is not recommended to disable 8x8mv in a real encode. +. +.TP .B (no)4x4mv Use additional macroblock types p8x4, p4x8, p4x4 (default: disabled). Without this option, P-frames will use only types i16x16, i4x4, p16x16, p16x8, p8x16, p8x8, skip. +Requires 8x8mv. .br The idea is to find the type and size that best describe a certain area of the picture. |