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1086 lines
25 KiB
Plaintext
1086 lines
25 KiB
Plaintext
@anchor{codec-options}
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@chapter Codec Options
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@c man begin CODEC OPTIONS
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libavcodec provides some generic global options, which can be set on
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all the encoders and decoders. In addition each codec may support
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so-called private options, which are specific for a given codec.
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Sometimes, a global option may only affect a specific kind of codec,
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and may be unsensical or ignored by another, so you need to be aware
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of the meaning of the specified options. Also some options are
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meant only for decoding or encoding.
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Options may be set by specifying -@var{option} @var{value} in the
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FFmpeg tools, or by setting the value explicitly in the
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@code{AVCodecContext} options or using the @file{libavutil/opt.h} API
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for programmatic use.
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The list of supported options follow:
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@table @option
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@item b @var{integer} (@emph{encoding,audio,video})
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Set bitrate in bits/s. Default value is 200K.
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@item ab @var{integer} (@emph{encoding,audio})
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Set audio bitrate (in bits/s). Default value is 128K.
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@item bt @var{integer} (@emph{encoding,video})
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Set video bitrate tolerance (in bits/s). In 1-pass mode, bitrate
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tolerance specifies how far ratecontrol is willing to deviate from the
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target average bitrate value. This is not related to min/max
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bitrate. Lowering tolerance too much has an adverse effect on quality.
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@item flags @var{flags} (@emph{decoding/encoding,audio,video,subtitles})
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Set generic flags.
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Possible values:
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@table @samp
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@item mv4
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Use four motion vector by macroblock (mpeg4).
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@item qpel
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Use 1/4 pel motion compensation.
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@item loop
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Use loop filter.
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@item qscale
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Use fixed qscale.
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@item gmc
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Use gmc.
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@item mv0
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Always try a mb with mv=<0,0>.
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@item input_preserved
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@item pass1
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Use internal 2pass ratecontrol in first pass mode.
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@item pass2
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Use internal 2pass ratecontrol in second pass mode.
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@item gray
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Only decode/encode grayscale.
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@item emu_edge
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Do not draw edges.
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@item psnr
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Set error[?] variables during encoding.
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@item truncated
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@item naq
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Normalize adaptive quantization.
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@item ildct
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Use interlaced DCT.
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@item low_delay
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Force low delay.
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@item global_header
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Place global headers in extradata instead of every keyframe.
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@item bitexact
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Use only bitexact stuff (except (I)DCT).
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@item aic
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Apply H263 advanced intra coding / mpeg4 ac prediction.
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@item cbp
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Deprecated, use mpegvideo private options instead.
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@item qprd
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Deprecated, use mpegvideo private options instead.
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@item ilme
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Apply interlaced motion estimation.
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@item cgop
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Use closed gop.
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@end table
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@item me_method @var{integer} (@emph{encoding,video})
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Set motion estimation method.
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Possible values:
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@table @samp
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@item zero
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zero motion estimation (fastest)
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@item full
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full motion estimation (slowest)
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@item epzs
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EPZS motion estimation (default)
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@item esa
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esa motion estimation (alias for full)
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@item tesa
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tesa motion estimation
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@item dia
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dia motion estimation (alias for epzs)
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@item log
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log motion estimation
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@item phods
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phods motion estimation
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@item x1
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X1 motion estimation
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@item hex
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hex motion estimation
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@item umh
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umh motion estimation
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@item iter
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iter motion estimation
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@end table
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@item extradata_size @var{integer}
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Set extradata size.
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@item time_base @var{rational number}
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Set codec time base.
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It is the fundamental unit of time (in seconds) in terms of which
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frame timestamps are represented. For fixed-fps content, timebase
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should be @code{1 / frame_rate} and timestamp increments should be
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identically 1.
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@item g @var{integer} (@emph{encoding,video})
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Set the group of picture size. Default value is 12.
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@item ar @var{integer} (@emph{decoding/encoding,audio})
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Set audio sampling rate (in Hz).
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@item ac @var{integer} (@emph{decoding/encoding,audio})
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Set number of audio channels.
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@item cutoff @var{integer} (@emph{encoding,audio})
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Set cutoff bandwidth.
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@item frame_size @var{integer} (@emph{encoding,audio})
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Set audio frame size.
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Each submitted frame except the last must contain exactly frame_size
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samples per channel. May be 0 when the codec has
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CODEC_CAP_VARIABLE_FRAME_SIZE set, in that case the frame size is not
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restricted. It is set by some decoders to indicate constant frame
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size.
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@item frame_number @var{integer}
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Set the frame number.
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@item delay @var{integer}
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@item qcomp @var{float} (@emph{encoding,video})
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Set video quantizer scale compression (VBR). It is used as a constant
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in the ratecontrol equation. Recommended range for default rc_eq:
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0.0-1.0.
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@item qblur @var{float} (@emph{encoding,video})
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Set video quantizer scale blur (VBR).
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@item qmin @var{integer} (@emph{encoding,video})
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Set min video quantizer scale (VBR). Must be included between -1 and
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69, default value is 2.
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@item qmax @var{integer} (@emph{encoding,video})
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Set max video quantizer scale (VBR). Must be included between -1 and
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1024, default value is 31.
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@item qdiff @var{integer} (@emph{encoding,video})
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Set max difference between the quantizer scale (VBR).
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@item bf @var{integer} (@emph{encoding,video})
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Set max number of B frames.
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@item b_qfactor @var{float} (@emph{encoding,video})
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Set qp factor between P and B frames.
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@item rc_strategy @var{integer} (@emph{encoding,video})
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Set ratecontrol method.
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@item b_strategy @var{integer} (@emph{encoding,video})
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Set strategy to choose between I/P/B-frames.
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@item ps @var{integer} (@emph{encoding,video})
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Set RTP payload size in bytes.
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@item mv_bits @var{integer}
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@item header_bits @var{integer}
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@item i_tex_bits @var{integer}
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@item p_tex_bits @var{integer}
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@item i_count @var{integer}
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@item p_count @var{integer}
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@item skip_count @var{integer}
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@item misc_bits @var{integer}
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@item frame_bits @var{integer}
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@item codec_tag @var{integer}
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@item bug @var{flags} (@emph{decoding,video})
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Workaround not auto detected encoder bugs.
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Possible values:
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@table @samp
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@item autodetect
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@item old_msmpeg4
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some old lavc generated msmpeg4v3 files (no autodetection)
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@item xvid_ilace
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Xvid interlacing bug (autodetected if fourcc==XVIX)
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@item ump4
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(autodetected if fourcc==UMP4)
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@item no_padding
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padding bug (autodetected)
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@item amv
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@item ac_vlc
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illegal vlc bug (autodetected per fourcc)
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@item qpel_chroma
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@item std_qpel
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old standard qpel (autodetected per fourcc/version)
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@item qpel_chroma2
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@item direct_blocksize
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direct-qpel-blocksize bug (autodetected per fourcc/version)
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@item edge
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edge padding bug (autodetected per fourcc/version)
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@item hpel_chroma
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@item dc_clip
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@item ms
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Workaround various bugs in microsoft broken decoders.
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@item trunc
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trancated frames
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@end table
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@item lelim @var{integer} (@emph{encoding,video})
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Set single coefficient elimination threshold for luminance (negative
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values also consider DC coefficient).
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@item celim @var{integer} (@emph{encoding,video})
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Set single coefficient elimination threshold for chrominance (negative
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values also consider dc coefficient)
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@item strict @var{integer} (@emph{decoding/encoding,audio,video})
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Specify how strictly to follow the standards.
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Possible values:
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@table @samp
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@item very
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strictly conform to a older more strict version of the spec or reference software
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@item strict
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strictly conform to all the things in the spec no matter what consequences
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@item normal
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@item unofficial
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allow unofficial extensions
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@item experimental
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allow non standardized experimental things, experimental
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(unfinished/work in progress/not well tested) decoders and encoders.
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Note: experimental decoders can pose a security risk, do not use this for
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decoding untrusted input.
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@end table
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@item b_qoffset @var{float} (@emph{encoding,video})
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Set QP offset between P and B frames.
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@item err_detect @var{flags} (@emph{decoding,audio,video})
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Set error detection flags.
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Possible values:
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@table @samp
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@item crccheck
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verify embedded CRCs
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@item bitstream
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detect bitstream specification deviations
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@item buffer
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detect improper bitstream length
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@item explode
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abort decoding on minor error detection
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@item careful
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consider things that violate the spec and have not been seen in the wild as errors
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@item compliant
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consider all spec non compliancies as errors
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@item aggressive
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consider things that a sane encoder should not do as an error
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@end table
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@item has_b_frames @var{integer}
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@item block_align @var{integer}
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@item mpeg_quant @var{integer} (@emph{encoding,video})
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Use MPEG quantizers instead of H.263.
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@item qsquish @var{float} (@emph{encoding,video})
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How to keep quantizer between qmin and qmax (0 = clip, 1 = use
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differentiable function).
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@item rc_qmod_amp @var{float} (@emph{encoding,video})
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Set experimental quantizer modulation.
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@item rc_qmod_freq @var{integer} (@emph{encoding,video})
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Set experimental quantizer modulation.
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@item rc_override_count @var{integer}
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@item rc_eq @var{string} (@emph{encoding,video})
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Set rate control equation. When computing the expression, besides the
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standard functions defined in the section 'Expression Evaluation', the
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following functions are available: bits2qp(bits), qp2bits(qp). Also
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the following constants are available: iTex pTex tex mv fCode iCount
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mcVar var isI isP isB avgQP qComp avgIITex avgPITex avgPPTex avgBPTex
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avgTex.
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@item maxrate @var{integer} (@emph{encoding,audio,video})
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Set max bitrate tolerance (in bits/s). Requires bufsize to be set.
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@item minrate @var{integer} (@emph{encoding,audio,video})
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Set min bitrate tolerance (in bits/s). Most useful in setting up a CBR
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encode. It is of little use elsewise.
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@item bufsize @var{integer} (@emph{encoding,audio,video})
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Set ratecontrol buffer size (in bits).
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@item rc_buf_aggressivity @var{float} (@emph{encoding,video})
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Currently useless.
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@item i_qfactor @var{float} (@emph{encoding,video})
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Set QP factor between P and I frames.
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@item i_qoffset @var{float} (@emph{encoding,video})
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Set QP offset between P and I frames.
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@item rc_init_cplx @var{float} (@emph{encoding,video})
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Set initial complexity for 1-pass encoding.
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@item dct @var{integer} (@emph{encoding,video})
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Set DCT algorithm.
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Possible values:
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@table @samp
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@item auto
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autoselect a good one (default)
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@item fastint
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fast integer
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@item int
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accurate integer
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@item mmx
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@item altivec
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@item faan
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floating point AAN DCT
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@end table
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@item lumi_mask @var{float} (@emph{encoding,video})
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Compress bright areas stronger than medium ones.
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@item tcplx_mask @var{float} (@emph{encoding,video})
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Set temporal complexity masking.
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@item scplx_mask @var{float} (@emph{encoding,video})
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Set spatial complexity masking.
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@item p_mask @var{float} (@emph{encoding,video})
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Set inter masking.
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@item dark_mask @var{float} (@emph{encoding,video})
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Compress dark areas stronger than medium ones.
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@item idct @var{integer} (@emph{decoding/encoding,video})
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Select IDCT implementation.
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Possible values:
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@table @samp
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@item auto
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@item int
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@item simple
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@item simplemmx
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@item arm
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@item altivec
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@item sh4
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@item simplearm
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@item simplearmv5te
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@item simplearmv6
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@item simpleneon
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@item simplealpha
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@item ipp
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@item xvidmmx
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@item faani
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floating point AAN IDCT
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@end table
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@item slice_count @var{integer}
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@item ec @var{flags} (@emph{decoding,video})
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Set error concealment strategy.
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Possible values:
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@table @samp
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@item guess_mvs
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iterative motion vector (MV) search (slow)
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@item deblock
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use strong deblock filter for damaged MBs
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@end table
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@item bits_per_coded_sample @var{integer}
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@item pred @var{integer} (@emph{encoding,video})
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Set prediction method.
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Possible values:
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@table @samp
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@item left
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@item plane
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@item median
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@end table
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@item aspect @var{rational number} (@emph{encoding,video})
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Set sample aspect ratio.
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@item debug @var{flags} (@emph{decoding/encoding,audio,video,subtitles})
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Print specific debug info.
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Possible values:
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@table @samp
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@item pict
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picture info
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@item rc
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rate control
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@item bitstream
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@item mb_type
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macroblock (MB) type
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@item qp
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per-block quantization parameter (QP)
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@item mv
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motion vector
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@item dct_coeff
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@item skip
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@item startcode
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@item pts
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@item er
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error recognition
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@item mmco
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memory management control operations (H.264)
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@item bugs
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@item vis_qp
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visualize quantization parameter (QP), lower QP are tinted greener
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@item vis_mb_type
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visualize block types
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@item buffers
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picture buffer allocations
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@item thread_ops
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threading operations
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@end table
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@item vismv @var{integer} (@emph{decoding,video})
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Visualize motion vectors (MVs).
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Possible values:
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@table @samp
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@item pf
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forward predicted MVs of P-frames
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@item bf
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forward predicted MVs of B-frames
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@item bb
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backward predicted MVs of B-frames
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@end table
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@item cmp @var{integer} (@emph{encoding,video})
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Set full pel me compare function.
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Possible values:
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@table @samp
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@item sad
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sum of absolute differences, fast (default)
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@item sse
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sum of squared errors
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@item satd
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sum of absolute Hadamard transformed differences
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@item dct
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sum of absolute DCT transformed differences
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@item psnr
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sum of squared quantization errors (avoid, low quality)
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@item bit
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number of bits needed for the block
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@item rd
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rate distortion optimal, slow
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@item zero
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0
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@item vsad
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sum of absolute vertical differences
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@item vsse
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sum of squared vertical differences
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@item nsse
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noise preserving sum of squared differences
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@item w53
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5/3 wavelet, only used in snow
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@item w97
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9/7 wavelet, only used in snow
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@item dctmax
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@item chroma
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@end table
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@item subcmp @var{integer} (@emph{encoding,video})
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Set sub pel me compare function.
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Possible values:
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@table @samp
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@item sad
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sum of absolute differences, fast (default)
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@item sse
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sum of squared errors
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@item satd
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sum of absolute Hadamard transformed differences
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@item dct
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sum of absolute DCT transformed differences
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@item psnr
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sum of squared quantization errors (avoid, low quality)
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@item bit
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number of bits needed for the block
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@item rd
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rate distortion optimal, slow
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@item zero
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0
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@item vsad
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sum of absolute vertical differences
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@item vsse
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sum of squared vertical differences
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@item nsse
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noise preserving sum of squared differences
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@item w53
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5/3 wavelet, only used in snow
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@item w97
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9/7 wavelet, only used in snow
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@item dctmax
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@item chroma
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@end table
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@item mbcmp @var{integer} (@emph{encoding,video})
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Set macroblock compare function.
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Possible values:
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@table @samp
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@item sad
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sum of absolute differences, fast (default)
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@item sse
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sum of squared errors
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@item satd
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sum of absolute Hadamard transformed differences
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@item dct
|
|
sum of absolute DCT transformed differences
|
|
@item psnr
|
|
sum of squared quantization errors (avoid, low quality)
|
|
@item bit
|
|
number of bits needed for the block
|
|
@item rd
|
|
rate distortion optimal, slow
|
|
@item zero
|
|
0
|
|
@item vsad
|
|
sum of absolute vertical differences
|
|
@item vsse
|
|
sum of squared vertical differences
|
|
@item nsse
|
|
noise preserving sum of squared differences
|
|
@item w53
|
|
5/3 wavelet, only used in snow
|
|
@item w97
|
|
9/7 wavelet, only used in snow
|
|
@item dctmax
|
|
|
|
@item chroma
|
|
|
|
@end table
|
|
|
|
@item ildctcmp @var{integer} (@emph{encoding,video})
|
|
Set interlaced dct compare function.
|
|
|
|
Possible values:
|
|
@table @samp
|
|
@item sad
|
|
sum of absolute differences, fast (default)
|
|
@item sse
|
|
sum of squared errors
|
|
@item satd
|
|
sum of absolute Hadamard transformed differences
|
|
@item dct
|
|
sum of absolute DCT transformed differences
|
|
@item psnr
|
|
sum of squared quantization errors (avoid, low quality)
|
|
@item bit
|
|
number of bits needed for the block
|
|
@item rd
|
|
rate distortion optimal, slow
|
|
@item zero
|
|
0
|
|
@item vsad
|
|
sum of absolute vertical differences
|
|
@item vsse
|
|
sum of squared vertical differences
|
|
@item nsse
|
|
noise preserving sum of squared differences
|
|
@item w53
|
|
5/3 wavelet, only used in snow
|
|
@item w97
|
|
9/7 wavelet, only used in snow
|
|
@item dctmax
|
|
|
|
@item chroma
|
|
|
|
@end table
|
|
|
|
@item dia_size @var{integer} (@emph{encoding,video})
|
|
Set diamond type & size for motion estimation.
|
|
|
|
@item last_pred @var{integer} (@emph{encoding,video})
|
|
Set amount of motion predictors from the previous frame.
|
|
|
|
@item preme @var{integer} (@emph{encoding,video})
|
|
Set pre motion estimation.
|
|
|
|
@item precmp @var{integer} (@emph{encoding,video})
|
|
Set pre motion estimation compare function.
|
|
|
|
Possible values:
|
|
@table @samp
|
|
@item sad
|
|
sum of absolute differences, fast (default)
|
|
@item sse
|
|
sum of squared errors
|
|
@item satd
|
|
sum of absolute Hadamard transformed differences
|
|
@item dct
|
|
sum of absolute DCT transformed differences
|
|
@item psnr
|
|
sum of squared quantization errors (avoid, low quality)
|
|
@item bit
|
|
number of bits needed for the block
|
|
@item rd
|
|
rate distortion optimal, slow
|
|
@item zero
|
|
0
|
|
@item vsad
|
|
sum of absolute vertical differences
|
|
@item vsse
|
|
sum of squared vertical differences
|
|
@item nsse
|
|
noise preserving sum of squared differences
|
|
@item w53
|
|
5/3 wavelet, only used in snow
|
|
@item w97
|
|
9/7 wavelet, only used in snow
|
|
@item dctmax
|
|
|
|
@item chroma
|
|
|
|
@end table
|
|
|
|
@item pre_dia_size @var{integer} (@emph{encoding,video})
|
|
Set diamond type & size for motion estimation pre-pass.
|
|
|
|
@item subq @var{integer} (@emph{encoding,video})
|
|
Set sub pel motion estimation quality.
|
|
|
|
@item dtg_active_format @var{integer}
|
|
|
|
@item me_range @var{integer} (@emph{encoding,video})
|
|
Set limit motion vectors range (1023 for DivX player).
|
|
|
|
@item ibias @var{integer} (@emph{encoding,video})
|
|
Set intra quant bias.
|
|
|
|
@item pbias @var{integer} (@emph{encoding,video})
|
|
Set inter quant bias.
|
|
|
|
@item color_table_id @var{integer}
|
|
|
|
@item global_quality @var{integer} (@emph{encoding,audio,video})
|
|
|
|
@item coder @var{integer} (@emph{encoding,video})
|
|
|
|
Possible values:
|
|
@table @samp
|
|
@item vlc
|
|
variable length coder / huffman coder
|
|
@item ac
|
|
arithmetic coder
|
|
@item raw
|
|
raw (no encoding)
|
|
@item rle
|
|
run-length coder
|
|
@item deflate
|
|
deflate-based coder
|
|
@end table
|
|
|
|
@item context @var{integer} (@emph{encoding,video})
|
|
Set context model.
|
|
|
|
@item slice_flags @var{integer}
|
|
|
|
@item xvmc_acceleration @var{integer}
|
|
|
|
@item mbd @var{integer} (@emph{encoding,video})
|
|
Set macroblock decision algorithm (high quality mode).
|
|
|
|
Possible values:
|
|
@table @samp
|
|
@item simple
|
|
use mbcmp (default)
|
|
@item bits
|
|
use fewest bits
|
|
@item rd
|
|
use best rate distortion
|
|
@end table
|
|
|
|
@item stream_codec_tag @var{integer}
|
|
|
|
@item sc_threshold @var{integer} (@emph{encoding,video})
|
|
Set scene change threshold.
|
|
|
|
@item lmin @var{integer} (@emph{encoding,video})
|
|
Set min lagrange factor (VBR).
|
|
|
|
@item lmax @var{integer} (@emph{encoding,video})
|
|
Set max lagrange factor (VBR).
|
|
|
|
@item nr @var{integer} (@emph{encoding,video})
|
|
Set noise reduction.
|
|
|
|
@item rc_init_occupancy @var{integer} (@emph{encoding,video})
|
|
Set number of bits which should be loaded into the rc buffer before
|
|
decoding starts.
|
|
|
|
@item flags2 @var{flags} (@emph{decoding/encoding,audio,video})
|
|
|
|
Possible values:
|
|
@table @samp
|
|
@item fast
|
|
Allow non spec compliant speedup tricks.
|
|
@item sgop
|
|
Deprecated, use mpegvideo private options instead.
|
|
@item noout
|
|
Skip bitstream encoding.
|
|
@item ignorecrop
|
|
Ignore cropping information from sps.
|
|
@item local_header
|
|
Place global headers at every keyframe instead of in extradata.
|
|
@item chunks
|
|
Frame data might be split into multiple chunks.
|
|
@item showall
|
|
Show all frames before the first keyframe.
|
|
@item skiprd
|
|
Deprecated, use mpegvideo private options instead.
|
|
@end table
|
|
|
|
@item error @var{integer} (@emph{encoding,video})
|
|
|
|
@item qns @var{integer} (@emph{encoding,video})
|
|
Deprecated, use mpegvideo private options instead.
|
|
|
|
@item threads @var{integer} (@emph{decoding/encoding,video})
|
|
|
|
Possible values:
|
|
@table @samp
|
|
@item auto
|
|
detect a good number of threads
|
|
@end table
|
|
|
|
@item me_threshold @var{integer} (@emph{encoding,video})
|
|
Set motion estimation threshold.
|
|
|
|
@item mb_threshold @var{integer} (@emph{encoding,video})
|
|
Set macroblock threshold.
|
|
|
|
@item dc @var{integer} (@emph{encoding,video})
|
|
Set intra_dc_precision.
|
|
|
|
@item nssew @var{integer} (@emph{encoding,video})
|
|
Set nsse weight.
|
|
|
|
@item skip_top @var{integer} (@emph{decoding,video})
|
|
Set number of macroblock rows at the top which are skipped.
|
|
|
|
@item skip_bottom @var{integer} (@emph{decoding,video})
|
|
Set number of macroblock rows at the bottom which are skipped.
|
|
|
|
@item profile @var{integer} (@emph{encoding,audio,video})
|
|
|
|
Possible values:
|
|
@table @samp
|
|
@item unknown
|
|
|
|
@item aac_main
|
|
|
|
@item aac_low
|
|
|
|
@item aac_ssr
|
|
|
|
@item aac_ltp
|
|
|
|
@item aac_he
|
|
|
|
@item aac_he_v2
|
|
|
|
@item aac_ld
|
|
|
|
@item aac_eld
|
|
|
|
@item mpeg2_aac_low
|
|
|
|
@item mpeg2_aac_he
|
|
|
|
@item dts
|
|
|
|
@item dts_es
|
|
|
|
@item dts_96_24
|
|
|
|
@item dts_hd_hra
|
|
|
|
@item dts_hd_ma
|
|
|
|
@end table
|
|
|
|
@item level @var{integer} (@emph{encoding,audio,video})
|
|
|
|
Possible values:
|
|
@table @samp
|
|
@item unknown
|
|
|
|
@end table
|
|
|
|
@item lowres @var{integer} (@emph{decoding,audio,video})
|
|
Decode at 1= 1/2, 2=1/4, 3=1/8 resolutions.
|
|
|
|
@item skip_threshold @var{integer} (@emph{encoding,video})
|
|
Set frame skip threshold.
|
|
|
|
@item skip_factor @var{integer} (@emph{encoding,video})
|
|
Set frame skip factor.
|
|
|
|
@item skip_exp @var{integer} (@emph{encoding,video})
|
|
Set frame skip exponent.
|
|
|
|
@item skipcmp @var{integer} (@emph{encoding,video})
|
|
Set frame skip compare function.
|
|
|
|
Possible values:
|
|
@table @samp
|
|
@item sad
|
|
sum of absolute differences, fast (default)
|
|
@item sse
|
|
sum of squared errors
|
|
@item satd
|
|
sum of absolute Hadamard transformed differences
|
|
@item dct
|
|
sum of absolute DCT transformed differences
|
|
@item psnr
|
|
sum of squared quantization errors (avoid, low quality)
|
|
@item bit
|
|
number of bits needed for the block
|
|
@item rd
|
|
rate distortion optimal, slow
|
|
@item zero
|
|
0
|
|
@item vsad
|
|
sum of absolute vertical differences
|
|
@item vsse
|
|
sum of squared vertical differences
|
|
@item nsse
|
|
noise preserving sum of squared differences
|
|
@item w53
|
|
5/3 wavelet, only used in snow
|
|
@item w97
|
|
9/7 wavelet, only used in snow
|
|
@item dctmax
|
|
|
|
@item chroma
|
|
|
|
@end table
|
|
|
|
@item border_mask @var{float} (@emph{encoding,video})
|
|
Increase the quantizer for macroblocks close to borders.
|
|
|
|
@item mblmin @var{integer} (@emph{encoding,video})
|
|
Set min macroblock lagrange factor (VBR).
|
|
|
|
@item mblmax @var{integer} (@emph{encoding,video})
|
|
Set max macroblock lagrange factor (VBR).
|
|
|
|
@item mepc @var{integer} (@emph{encoding,video})
|
|
Set motion estimation bitrate penalty compensation (1.0 = 256).
|
|
|
|
@item skip_loop_filter @var{integer} (@emph{decoding,video})
|
|
@item skip_idct @var{integer} (@emph{decoding,video})
|
|
@item skip_frame @var{integer} (@emph{decoding,video})
|
|
|
|
Make decoder discard processing depending on the frame type selected
|
|
by the option value.
|
|
|
|
@option{skip_loop_filter} skips frame loop filtering, @option{skip_idct}
|
|
skips frame IDCT/dequantization, @option{skip_frame} skips decoding.
|
|
|
|
Possible values:
|
|
@table @samp
|
|
@item none
|
|
Discard no frame.
|
|
|
|
@item default
|
|
Discard useless frames like 0-sized frames.
|
|
|
|
@item noref
|
|
Discard all non-reference frames.
|
|
|
|
@item bidir
|
|
Discard all bidirectional frames.
|
|
|
|
@item nokey
|
|
Discard all frames excepts keyframes.
|
|
|
|
@item all
|
|
Discard all frames.
|
|
@end table
|
|
|
|
Default value is @samp{default}.
|
|
|
|
@item bidir_refine @var{integer} (@emph{encoding,video})
|
|
Refine the two motion vectors used in bidirectional macroblocks.
|
|
|
|
@item brd_scale @var{integer} (@emph{encoding,video})
|
|
Downscale frames for dynamic B-frame decision.
|
|
|
|
@item keyint_min @var{integer} (@emph{encoding,video})
|
|
Set minimum interval between IDR-frames.
|
|
|
|
@item refs @var{integer} (@emph{encoding,video})
|
|
Set reference frames to consider for motion compensation.
|
|
|
|
@item chromaoffset @var{integer} (@emph{encoding,video})
|
|
Set chroma qp offset from luma.
|
|
|
|
@item trellis @var{integer} (@emph{encoding,audio,video})
|
|
Set rate-distortion optimal quantization.
|
|
|
|
@item sc_factor @var{integer} (@emph{encoding,video})
|
|
Set value multiplied by qscale for each frame and added to
|
|
scene_change_score.
|
|
|
|
@item mv0_threshold @var{integer} (@emph{encoding,video})
|
|
@item b_sensitivity @var{integer} (@emph{encoding,video})
|
|
Adjust sensitivity of b_frame_strategy 1.
|
|
|
|
@item compression_level @var{integer} (@emph{encoding,audio,video})
|
|
@item min_prediction_order @var{integer} (@emph{encoding,audio})
|
|
@item max_prediction_order @var{integer} (@emph{encoding,audio})
|
|
@item timecode_frame_start @var{integer} (@emph{encoding,video})
|
|
Set GOP timecode frame start number, in non drop frame format.
|
|
|
|
@item request_channels @var{integer} (@emph{decoding,audio})
|
|
Set desired number of audio channels.
|
|
|
|
@item bits_per_raw_sample @var{integer}
|
|
@item channel_layout @var{integer} (@emph{decoding/encoding,audio})
|
|
|
|
Possible values:
|
|
@table @samp
|
|
@end table
|
|
@item request_channel_layout @var{integer} (@emph{decoding,audio})
|
|
|
|
Possible values:
|
|
@table @samp
|
|
@end table
|
|
@item rc_max_vbv_use @var{float} (@emph{encoding,video})
|
|
@item rc_min_vbv_use @var{float} (@emph{encoding,video})
|
|
@item ticks_per_frame @var{integer} (@emph{decoding/encoding,audio,video})
|
|
@item color_primaries @var{integer} (@emph{decoding/encoding,video})
|
|
@item color_trc @var{integer} (@emph{decoding/encoding,video})
|
|
@item colorspace @var{integer} (@emph{decoding/encoding,video})
|
|
@item color_range @var{integer} (@emph{decoding/encoding,video})
|
|
@item chroma_sample_location @var{integer} (@emph{decoding/encoding,video})
|
|
|
|
@item log_level_offset @var{integer}
|
|
Set the log level offset.
|
|
|
|
@item slices @var{integer} (@emph{encoding,video})
|
|
Number of slices, used in parallelized encoding.
|
|
|
|
@item thread_type @var{flags} (@emph{decoding/encoding,video})
|
|
Select multithreading type.
|
|
|
|
Possible values:
|
|
@table @samp
|
|
@item slice
|
|
|
|
@item frame
|
|
|
|
@end table
|
|
@item audio_service_type @var{integer} (@emph{encoding,audio})
|
|
Set audio service type.
|
|
|
|
Possible values:
|
|
@table @samp
|
|
@item ma
|
|
Main Audio Service
|
|
@item ef
|
|
Effects
|
|
@item vi
|
|
Visually Impaired
|
|
@item hi
|
|
Hearing Impaired
|
|
@item di
|
|
Dialogue
|
|
@item co
|
|
Commentary
|
|
@item em
|
|
Emergency
|
|
@item vo
|
|
Voice Over
|
|
@item ka
|
|
Karaoke
|
|
@end table
|
|
|
|
@item request_sample_fmt @var{sample_fmt} (@emph{decoding,audio})
|
|
Set sample format audio decoders should prefer. Default value is
|
|
@code{none}.
|
|
|
|
@item pkt_timebase @var{rational number}
|
|
|
|
@item sub_charenc @var{encoding} (@emph{decoding,subtitles})
|
|
Set the input subtitles character encoding.
|
|
|
|
@item field_order @var{field_order} (@emph{video})
|
|
Set/override the field order of the video.
|
|
Possible values:
|
|
@table @samp
|
|
@item progressive
|
|
Progressive video
|
|
@item tt
|
|
Interlaced video, top field coded and displayed first
|
|
@item bb
|
|
Interlaced video, bottom field coded and displayed first
|
|
@item tb
|
|
Interlaced video, top coded first, bottom displayed first
|
|
@item bt
|
|
Interlaced video, bottom coded first, top displayed first
|
|
@end table
|
|
|
|
@item skip_alpha @var{integer} (@emph{decoding,video})
|
|
causes alpha plane not to be decoded, like "gray" which skips chroma.
|
|
@end table
|
|
|
|
@c man end CODEC OPTIONS
|
|
|
|
@include decoders.texi
|
|
@include encoders.texi
|