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@anchor{codec-options}
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@chapter Codec Options
@c man begin CODEC OPTIONS

libavcodec provides some generic global options, which can be set on
all the encoders and decoders. In addition each codec may support
so-called private options, which are specific for a given codec.

Sometimes, a global option may only affect a specific kind of codec,
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and may be nonsensical 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
meant only for decoding or encoding.

Options may be set by specifying -@var{option} @var{value} in the
FFmpeg tools, or by setting the value explicitly in the
@code{AVCodecContext} options or using the @file{libavutil/opt.h} API
for programmatic use.

The list of supported options follow:

@table @option
@item b @var{integer} (@emph{encoding,audio,video})
Set bitrate in bits/s. Default value is 200K.

@item ab @var{integer} (@emph{encoding,audio})
Set audio bitrate (in bits/s). Default value is 128K.

@item bt @var{integer} (@emph{encoding,video})
Set video bitrate tolerance (in bits/s). In 1-pass mode, bitrate
tolerance specifies how far ratecontrol is willing to deviate from the
target average bitrate value. This is not related to min/max
bitrate. Lowering tolerance too much has an adverse effect on quality.

@item flags @var{flags} (@emph{decoding/encoding,audio,video,subtitles})
Set generic flags.

Possible values:
@table @samp
@item mv4
Use four motion vector by macroblock (mpeg4).
@item qpel
Use 1/4 pel motion compensation.
@item loop
Use loop filter.
@item qscale
Use fixed qscale.
@item gmc
Use gmc.
@item mv0
Always try a mb with mv=<0,0>.
@item input_preserved

@item pass1
Use internal 2pass ratecontrol in first pass mode.
@item pass2
Use internal 2pass ratecontrol in second pass mode.
@item gray
Only decode/encode grayscale.
@item emu_edge
Do not draw edges.
@item psnr
Set error[?] variables during encoding.
@item truncated

@item naq
Normalize adaptive quantization.
@item ildct
Use interlaced DCT.
@item low_delay
Force low delay.
@item global_header
Place global headers in extradata instead of every keyframe.
@item bitexact
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Only write platform-, build- and time-independent data. (except (I)DCT).
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This ensures that file and data checksums are reproducible and match between
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platforms. Its primary use is for regression testing.
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@item aic
Apply H263 advanced intra coding / mpeg4 ac prediction.
@item cbp
Deprecated, use mpegvideo private options instead.
@item qprd
Deprecated, use mpegvideo private options instead.
@item ilme
Apply interlaced motion estimation.
@item cgop
Use closed gop.
@end table

@item me_method @var{integer} (@emph{encoding,video})
Set motion estimation method.

Possible values:
@table @samp
@item zero
zero motion estimation (fastest)
@item full
full motion estimation (slowest)
@item epzs
EPZS motion estimation (default)
@item esa
esa motion estimation (alias for full)
@item tesa
tesa motion estimation
@item dia
dia motion estimation (alias for epzs)
@item log
log motion estimation
@item phods
phods motion estimation
@item x1
X1 motion estimation
@item hex
hex motion estimation
@item umh
umh motion estimation
@item iter
iter motion estimation
@end table

@item extradata_size @var{integer}
Set extradata size.

@item time_base @var{rational number}
Set codec time base.

It is the fundamental unit of time (in seconds) in terms of which
frame timestamps are represented. For fixed-fps content, timebase
should be @code{1 / frame_rate} and timestamp increments should be
identically 1.

@item g @var{integer} (@emph{encoding,video})
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Set the group of picture (GOP) size. Default value is 12.
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@item ar @var{integer} (@emph{decoding/encoding,audio})
Set audio sampling rate (in Hz).

@item ac @var{integer} (@emph{decoding/encoding,audio})
Set number of audio channels.

@item cutoff @var{integer} (@emph{encoding,audio})
Set cutoff bandwidth.

@item frame_size @var{integer} (@emph{encoding,audio})
Set audio frame size.

Each submitted frame except the last must contain exactly frame_size
samples per channel. May be 0 when the codec has
CODEC_CAP_VARIABLE_FRAME_SIZE set, in that case the frame size is not
restricted. It is set by some decoders to indicate constant frame
size.

@item frame_number @var{integer}
Set the frame number.

@item delay @var{integer}

@item qcomp @var{float} (@emph{encoding,video})
Set video quantizer scale compression (VBR). It is used as a constant
in the ratecontrol equation. Recommended range for default rc_eq:
0.0-1.0.

@item qblur @var{float} (@emph{encoding,video})
Set video quantizer scale blur (VBR).

@item qmin @var{integer} (@emph{encoding,video})
Set min video quantizer scale (VBR). Must be included between -1 and
69, default value is 2.

@item qmax @var{integer} (@emph{encoding,video})
Set max video quantizer scale (VBR). Must be included between -1 and
1024, default value is 31.

@item qdiff @var{integer} (@emph{encoding,video})
Set max difference between the quantizer scale (VBR).

@item bf @var{integer} (@emph{encoding,video})
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Set max number of B frames between non-B-frames.

Must be an integer between -1 and 16. 0 means that B-frames are
disabled. If a value of -1 is used, it will choose an automatic value
depending on the encoder.

Default value is 0.
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@item b_qfactor @var{float} (@emph{encoding,video})
Set qp factor between P and B frames.

@item rc_strategy @var{integer} (@emph{encoding,video})
Set ratecontrol method.

@item b_strategy @var{integer} (@emph{encoding,video})
Set strategy to choose between I/P/B-frames.

@item ps @var{integer} (@emph{encoding,video})
Set RTP payload size in bytes.

@item mv_bits @var{integer}
@item header_bits @var{integer}
@item i_tex_bits @var{integer}
@item p_tex_bits @var{integer}
@item i_count @var{integer}
@item p_count @var{integer}
@item skip_count @var{integer}
@item misc_bits @var{integer}
@item frame_bits @var{integer}
@item codec_tag @var{integer}
@item bug @var{flags} (@emph{decoding,video})
Workaround not auto detected encoder bugs.

Possible values:
@table @samp
@item autodetect

@item old_msmpeg4
some old lavc generated msmpeg4v3 files (no autodetection)
@item xvid_ilace
Xvid interlacing bug (autodetected if fourcc==XVIX)
@item ump4
(autodetected if fourcc==UMP4)
@item no_padding
padding bug (autodetected)
@item amv

@item ac_vlc
illegal vlc bug (autodetected per fourcc)
@item qpel_chroma

@item std_qpel
old standard qpel (autodetected per fourcc/version)
@item qpel_chroma2

@item direct_blocksize
direct-qpel-blocksize bug (autodetected per fourcc/version)
@item edge
edge padding bug (autodetected per fourcc/version)
@item hpel_chroma

@item dc_clip

@item ms
Workaround various bugs in microsoft broken decoders.
@item trunc
trancated frames
@end table

@item lelim @var{integer} (@emph{encoding,video})
Set single coefficient elimination threshold for luminance (negative
values also consider DC coefficient).

@item celim @var{integer} (@emph{encoding,video})
Set single coefficient elimination threshold for chrominance (negative
values also consider dc coefficient)

@item strict @var{integer} (@emph{decoding/encoding,audio,video})
Specify how strictly to follow the standards.

Possible values:
@table @samp
@item very
strictly conform to a older more strict version of the spec or reference software
@item strict
strictly conform to all the things in the spec no matter what consequences
@item normal

@item unofficial
allow unofficial extensions
@item experimental
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allow non standardized experimental things, experimental
(unfinished/work in progress/not well tested) decoders and encoders.
Note: experimental decoders can pose a security risk, do not use this for
decoding untrusted input.
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@end table

@item b_qoffset @var{float} (@emph{encoding,video})
Set QP offset between P and B frames.

@item err_detect @var{flags} (@emph{decoding,audio,video})
Set error detection flags.

Possible values:
@table @samp
@item crccheck
verify embedded CRCs
@item bitstream
detect bitstream specification deviations
@item buffer
detect improper bitstream length
@item explode
abort decoding on minor error detection
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@item ignore_err
ignore decoding errors, and continue decoding.
This is useful if you want to analyze the content of a video and thus want
everything to be decoded no matter what. This option will not result in a video
that is pleasing to watch in case of errors.
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@item careful
consider things that violate the spec and have not been seen in the wild as errors
@item compliant
consider all spec non compliancies as errors
@item aggressive
consider things that a sane encoder should not do as an error
@end table

@item has_b_frames @var{integer}

@item block_align @var{integer}

@item mpeg_quant @var{integer} (@emph{encoding,video})
Use MPEG quantizers instead of H.263.

@item qsquish @var{float} (@emph{encoding,video})
How to keep quantizer between qmin and qmax (0 = clip, 1 = use
differentiable function).

@item rc_qmod_amp @var{float} (@emph{encoding,video})
Set experimental quantizer modulation.

@item rc_qmod_freq @var{integer} (@emph{encoding,video})
Set experimental quantizer modulation.

@item rc_override_count @var{integer}

@item rc_eq @var{string} (@emph{encoding,video})
Set rate control equation. When computing the expression, besides the
standard functions defined in the section 'Expression Evaluation', the
following functions are available: bits2qp(bits), qp2bits(qp). Also
the following constants are available: iTex pTex tex mv fCode iCount
mcVar var isI isP isB avgQP qComp avgIITex avgPITex avgPPTex avgBPTex
avgTex.

@item maxrate @var{integer} (@emph{encoding,audio,video})
Set max bitrate tolerance (in bits/s). Requires bufsize to be set.

@item minrate @var{integer} (@emph{encoding,audio,video})
Set min bitrate tolerance (in bits/s). Most useful in setting up a CBR
encode. It is of little use elsewise.

@item bufsize @var{integer} (@emph{encoding,audio,video})
Set ratecontrol buffer size (in bits).

@item rc_buf_aggressivity @var{float} (@emph{encoding,video})
Currently useless.

@item i_qfactor @var{float} (@emph{encoding,video})
Set QP factor between P and I frames.

@item i_qoffset @var{float} (@emph{encoding,video})
Set QP offset between P and I frames.

@item rc_init_cplx @var{float} (@emph{encoding,video})
Set initial complexity for 1-pass encoding.

@item dct @var{integer} (@emph{encoding,video})
Set DCT algorithm.

Possible values:
@table @samp
@item auto
autoselect a good one (default)
@item fastint
fast integer
@item int
accurate integer
@item mmx

@item altivec

@item faan
floating point AAN DCT
@end table

@item lumi_mask @var{float} (@emph{encoding,video})
Compress bright areas stronger than medium ones.

@item tcplx_mask @var{float} (@emph{encoding,video})
Set temporal complexity masking.

@item scplx_mask @var{float} (@emph{encoding,video})
Set spatial complexity masking.

@item p_mask @var{float} (@emph{encoding,video})
Set inter masking.

@item dark_mask @var{float} (@emph{encoding,video})
Compress dark areas stronger than medium ones.

@item idct @var{integer} (@emph{decoding/encoding,video})
Select IDCT implementation.

Possible values:
@table @samp
@item auto

@item int

@item simple

@item simplemmx

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@item simpleauto
Automatically pick a IDCT compatible with the simple one

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@item arm

@item altivec

@item sh4

@item simplearm

@item simplearmv5te

@item simplearmv6

@item simpleneon

@item simplealpha

@item ipp

@item xvidmmx

@item faani
floating point AAN IDCT
@end table

@item slice_count @var{integer}

@item ec @var{flags} (@emph{decoding,video})
Set error concealment strategy.

Possible values:
@table @samp
@item guess_mvs
iterative motion vector (MV) search (slow)
@item deblock
use strong deblock filter for damaged MBs
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@item favor_inter
favor predicting from the previous frame instead of the current
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@end table

@item bits_per_coded_sample @var{integer}

@item pred @var{integer} (@emph{encoding,video})
Set prediction method.

Possible values:
@table @samp
@item left

@item plane

@item median

@end table

@item aspect @var{rational number} (@emph{encoding,video})
Set sample aspect ratio.

@item debug @var{flags} (@emph{decoding/encoding,audio,video,subtitles})
Print specific debug info.

Possible values:
@table @samp
@item pict
picture info
@item rc
rate control
@item bitstream

@item mb_type
macroblock (MB) type
@item qp
per-block quantization parameter (QP)
@item mv
motion vector
@item dct_coeff

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@item green_metadata
display complexity metadata for the upcoming frame, GoP or for a given duration.

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@item skip

@item startcode

@item pts

@item er
error recognition
@item mmco
memory management control operations (H.264)
@item bugs

@item vis_qp
visualize quantization parameter (QP), lower QP are tinted greener
@item vis_mb_type
visualize block types
@item buffers
picture buffer allocations
@item thread_ops
threading operations
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@item nomc
skip motion compensation
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@end table

@item vismv @var{integer} (@emph{decoding,video})
Visualize motion vectors (MVs).

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This option is deprecated, see the codecview filter instead.

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Possible values:
@table @samp
@item pf
forward predicted MVs of P-frames
@item bf
forward predicted MVs of B-frames
@item bb
backward predicted MVs of B-frames
@end table

@item cmp @var{integer} (@emph{encoding,video})
Set full pel me 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 subcmp @var{integer} (@emph{encoding,video})
Set sub pel me 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 mbcmp @var{integer} (@emph{encoding,video})
Set macroblock 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 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
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Allow non spec compliant speedup tricks.
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@item sgop
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@item noout
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Skip bitstream encoding.
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@item ignorecrop
Ignore cropping information from sps.
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@item local_header
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Place global headers at every keyframe instead of in extradata.
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@item chunks
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Frame data might be split into multiple chunks.
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@item showall
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Show all frames before the first keyframe.
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@item skiprd
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Deprecated, use mpegvideo private options instead.
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@item export_mvs
Export motion vectors into frame side-data (see @code{AV_FRAME_DATA_MOTION_VECTORS})
for codecs that support it. See also @file{doc/examples/export_mvs.c}.
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@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})
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Set the number of threads to be used, in case the selected codec
implementation supports multi-threading.
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Possible values:
@table @samp
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@item auto, 0
automatically select the number of threads to set
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@end table

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Default value is @samp{auto}.

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@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

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@item mpeg2_aac_low

@item mpeg2_aac_he

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@item mpeg4_sp

@item mpeg4_core

@item mpeg4_main

@item mpeg4_asp

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@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.
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Negative values behave identical to the corresponding positive ones, except
that the score is normalized.
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Positive values exist primarily for compatibility reasons and are not so useful.
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@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})
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@item color_range @var{integer} (@emph{decoding/encoding,video})
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If used as input parameter, it serves as a hint to the decoder, which
color_range the input has.

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@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})
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Select which multithreading methods to use.

Use of @samp{frame} will increase decoding delay by one frame per
thread, so clients which cannot provide future frames should not use
it.
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Possible values:
@table @samp
@item slice
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Decode more than one part of a single frame at once.
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Multithreading using slices works only when the video was encoded with
slices.
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@item frame
Decode more than one frame at once.
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@end table
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Default value is @samp{slice+frame}.

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@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.
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@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
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@item skip_alpha @var{integer} (@emph{decoding,video})
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Set to 1 to disable processing alpha (transparency). This works like the
@samp{gray} flag in the @option{flags} option which skips chroma information
instead of alpha. Default is 0.
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@item codec_whitelist @var{list} (@emph{input})
"," separated List of allowed decoders. By default all are allowed.

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@item dump_separator @var{string} (@emph{input})
Separator used to separate the fields printed on the command line about the
Stream parameters.
For example to separate the fields with newlines and indention:
@example
ffprobe -dump_separator "
                          "  -i ~/videos/matrixbench_mpeg2.mpg
@end example

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@end table

@c man end CODEC OPTIONS

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@ifclear config-writeonly
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@include decoders.texi
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@end ifclear
@ifclear config-readonly
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@include encoders.texi
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@end ifclear