mirror of https://github.com/mpv-player/mpv
XviD option descriptions, patch by Guillaume POIRIER <gpoirier@irisa.fr>
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@12979 b3059339-0415-0410-9bf9-f77b7e298cf2
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@ -5440,76 +5440,106 @@ specify the pass in 2pass mode
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.B bitrate=<value>
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sets the bitrate to be used in kbits/\:second if <16000 or in bits/\:second
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if >16000
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(CBR or 2pass mode, default=687 kbits/s)
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(CBR or 2pass mode, default: 687 kbits/s)
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.TP
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.B fixed_quant=<1\-31>
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switch to fixed quantizer mode and specify the quantizer to be used
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.TP
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.B me_quality=<0\-6>
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specify the motion detection quality (default=6)
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This option controls the motion estimation subsystem.
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The higher the value, the more precise the estimation should be.
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The more precise the motion estimation is, the more bits can be saved.
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Precision is gained at the expense of CPU time so decrease this setting if
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you need realtime encoding.
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(default: 6)
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.TP
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.B interlacing
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enable support for interlaced content (default=off)
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For interlaced video material, turn this option on.
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.I Note:
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This option does not deinterlace video, it encodes it field-based
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(default: off).
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.TP
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.B 4mv\ \ \ \
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use 4 motion vectors per macro-block, might give better compression at the
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cost of a slower encoding (default=off)
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cost of a slower encoding (default: off).
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.br
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.I WARNING:
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This option doesn't exist in XviD-1.0.x.
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.TP
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.B rc_reaction_delay_factor=<value>
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specify how fast the rate control reacts, lower values are faster
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This parameter controls the delay in frames before the CBR rate controller
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will react to bitrate changes and will try to compensate the change to obtain
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a constant bitrate over an averaging range of frames.
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.TP
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.B rc_averaging_period=<value>
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period to reach the required average
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Real CBR is hard to achieve.
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Depending on the video material, bitrate can be variable, and hard to predict.
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That's why XviD uses an averaging period for which it guarantees a given
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amount of bits (minus a small variation).
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This settings expresses the "number of frames" for which XviD averages
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bitrate and tries to achieve CBR.
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.TP
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.B rc_buffer=<value>
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size of the rate control buffer
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.TP
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.B quant_range=<1\-31>\-<1\-31>[/<1\-31>\-<1\-31>]
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min & max quantizer for all frames (default=2\-31, CBR mode)
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min & max quantizer for all frames (default: 2\-31, CBR mode)
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.br
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min & max quantizer for I/P frames (default=2\-31/2\-31, 2pass mode)
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min & max quantizer for I/P frames (default: 2\-31/2\-31, 2pass mode)
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.TP
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.B min_key_interval=<value>
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minimum interval between key frames (default=0, 2pass only)
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minimum interval between key frames (default: 0, 2pass only)
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.TP
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.B max_key_interval=<value>
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maximum interval between key frames (default=10*fps)
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maximum interval between key frames (default: 10*fps)
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.TP
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.B mpeg_quant
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use MPEG quantizers instead of H.263 (default=off)
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use MPEG quantizers instead of H.263.
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For high bitrates, you will find that MPEG quantization preserves more detail.
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For low bitrates, the smoothing of H.263 will give you less block noise.
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When using custom matrices, MPEG must be used.
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(default: off)
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.TP
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.B mod_quant
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decide whether to use MPEG or H.263 quantizers on a frame-by-frame basis.
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(default=off, 2pass mode only)
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(default: off, 2pass mode only)
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.TP
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.B greyscale
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encode in black & white (default=off)
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Make XviD discard chroma planes so the encoded video is greyscale only.
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Note that this does not speed up encoding, it just prevents chroma data
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from being written in the last stage of encoding.
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(default: off)
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.TP
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.B debug\ \
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Save per-frame statistics in xvid.dbg (default=off).
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Save per-frame statistics in ./xvid.dbg (default: off).
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This is NOT the 2pass control file.
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.TP
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.B keyframe_boost=<0\-1000>
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(default=0, 2pass mode only)
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Shift some bits from the pool for other frame types to intra frames,
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thus improving keyframe quality.
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(default: 0, 2pass mode only)
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.TP
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.B kfthreshold=<value>
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(default=10, 2pass mode only)
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(default: 10, 2pass mode only)
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.TP
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.B kfreduction=<0\-100>
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(default=30, 2pass mode only)
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The above two settings can be used to adjust the size of keyframes that
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you consider too close to the first (in a row).
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kfthreshold sets the range in which keyframes are reduced, and
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kfreduction determines the bitrate reduction they get.
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The last i-frame will get treated normally.
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(default: 30, 2pass mode only)
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.RE
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.PP
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The following options are only available with the latest stable
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XviD 0.9.2 (api3) version and are marked as experimental and unstable.
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The newest development version of XviD 1.0 (api4) supports
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them fully.
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releases of XviD 1.0.x (api4).
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.TP
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.B packed\
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create a bitstream that can be decoded delay-free (default=off)
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create a bitstream that can be decoded delay-free (default: off)
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.br
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.I WARNING:
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this will generate an illegal bitstream, and WILL NOT be
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this will generate an illegal bitstream, and WILL NOT be
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decodeable by ISO-MPEG4 decoders except DivX/libavcodec/XviD
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.br
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.I WARNING:
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@ -5517,40 +5547,84 @@ this will also store a fake DivX version in the file so the bug
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autodetection of some decoders might be confused
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.TP
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.B divx5bvop
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generate DivX5 compatible B-frames (default=on)
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generate DivX5 compatible B-frames (default: on)
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.TP
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.B qpel\ \ \
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enable quarter-pixel motion estimation (default=off)
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MPEG4 uses a half pixel precision for its motion search by default.
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The standard proposes a mode where encoders are allowed to use quarter
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pixel precision.
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This option usually results in a sharper image.
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Unfortunately it has a great impact on bitrate and sometimes the
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higher bitrate use will prevent it from giving a better image
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quality at a fixed bitrate.
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It's better to test with and without this option and see whether it
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is worth activating.
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(default: off)
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.TP
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.B gmc\ \ \ \
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enable global motion compensation, may save bits on panning scenes (default=off)
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Enable Global Motion Compensation, which makes XviD generate Sprite
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Frames which best describe Pan/Zoom/Rotating images.
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The decision whether to activate this option or not to save bits
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depends highly on the video material.
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(default: off)
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.TP
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.B trellis
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Trellis Quantization is a kind of adaptive quantization method that
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saves bits by modifying quantized coefficients to make them more
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compressible by the entropy encoder.
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Its impact on quality is good, and if VHQ uses too much CPU for you,
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this setting can be a good alternative to save a few bits (and gain
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quality at fixed bitrate) at a lesser cost than with VHQ (default: off).
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.TP
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.B cartoon
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Activate this if your encoded sequence is an anime/cartoon.
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It modifies some XviD internal thresholds so XviD takes better decisions on
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frame types and motion vectors for flat looking cartoons.
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.TP
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.B chroma_me
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uses chroma information to estimate motion (default=off)
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The usual motion estimation algorithm uses only the luminance information to
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find the best motion vector.
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However for some video material, using the chroma planes can help find
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better vectors.
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This setting toggles the use of chroma planes for motion estimation
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(default: off).
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.TP
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.B chroma_opt
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enable a chroma optimizer prefilter (default=off)
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enable a chroma optimizer prefilter (default: off)
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.TP
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.B reduced
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enable encoding reduced resolution frames (default=off)
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enable encoding reduced resolution frames (default: off)
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.TP
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.B max_bframes=<0\-4>
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maximum number of B frames to put between I/P frames (default=0)
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maximum number of B frames to put between I/P frames (default: 0)
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.TP
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.B bquant_ratio=<0\-1000>
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quantizer ratio between B and non B frames, 150=1.50 (default=150)
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quantizer ratio between B and non B frames, 150=1.50 (default: 150)
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.TP
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.B bquant_offset=<-1000\-1000>
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quantizer offset between B and non B frames, 100=1.00 (default=100)
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quantizer offset between B and non B frames, 100=1.00 (default: 100)
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.TP
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.B bf_threshold=<-255\-255>
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change the probability of a frame to be a bframe (default=0)
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Sometimes B frames do not look good, and introduce artifacts when most of
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the frame is static and some small zones have high motion (in a static
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scene with a man talking, his mouth will probably look bad if what is
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surrounding the man and his mouth is completly static).
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This setting allows you to favorize or not, the use of B frames.
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The higher the value, the higher the probability of B frames being used.
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(default: 0)
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.TP
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.B hq_ac\ \
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enable a better prediction of AC component (default=off)
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Activates High Quality AC coefficient prediction from neighbor blocks.
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(default:off)
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.TP
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.B vhq=<0\-4>
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enable a higher quality ME search using DCT, faster to slower:
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The motion search algorithm is based on a search in the usual color domain
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and tries to find a motion vector that minimizes the difference between the
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reference frame and the encoded frame.
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With this setting activated, XviD will also use the frequency domain (DCT)
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to search for a motion vector that minimizes not only the spatial
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difference but also the encoding length of the block.
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Fastest to slowest:
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.PD 0
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.RSs
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.IPs 0
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@ -5569,8 +5643,8 @@ wide search
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.B aspect=<x/y | f (float value)>
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Store movie aspect internally, just like MPEG files.
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Much nicer solution than rescaling, because quality isn't decreased.
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MPlayer and few others players will play these files correctly, others will display
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them with the wrong aspect.
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MPlayer and a few others players will play these files correctly, others
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will display them with the wrong aspect.
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The aspect parameter can be given as a ratio or a floating point number.
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.TP
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.B autoaspect
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@ -5580,7 +5654,8 @@ filter chain.
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.TP
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.B psnr\ \ \
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Print the psnr (peak signal to noise ratio) for the whole video after encoding
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and store the per frame psnr in a file with a name like 'psnr_hhmmss.log'.
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and store the per frame psnr in a file with a name like 'psnr_hhmmss.log' in
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the current directory.
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Returned values are in dB (decibel), the higher the better.
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.
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.
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