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###############################
# General encoding parameters #
###############################
# threads = <N>
# Sets the number of threads to be used for processing. N must be
# between 1 and 4 inclusive.
#threads = 1
# 2pass_bug_workaround
# Enables a workaround for an x264 bug which sometimes causes the
# second pass of a 2-pass encode to fail while reading the 2-pass
# logfile.
2pass_bug_workaround
###########################
# Video stream properties #
###########################
# level_idc = <N>
# Sets the H.264 level to use for encoding. N can be any of the
# following (note that the resolutions given are only examples; see
# e.g. http://en.wikipedia.org/wiki/H.264/MPEG-4_AVC):
#
# N Level Max. bitrate Resolution (WxH@FPS)
# -- ----- ------------ ------------
# 10 1 64 kbit/s 176x144@15
# 11 1.1 192 kbit/s 320x240@10
# 12 1.2 384 kbit/s 320x240@20
# 13 1.3 768 kbit/s 352x288@30
# 20 2 2 Mbit/s 352x288@30
# 21 2.1 4 Mbit/s 352x480@30
# 22 2.2 4 Mbit/s 720x480@15
# 30 3 10 Mbit/s 720x480@30
# 31 3.1 14 Mbit/s 1280x720@30
# 32 3.2 20 Mbit/s 1280x720@60
# 40 4 20 Mbit/s 1920x1088@30
# 41 4.1 50 Mbit/s 1920x1088@30
# 42 4.2 50 Mbit/s 1920x1088@60
# 50 5 135 Mbit/s 2560x1920@30
# 51 5.1 240 Mbit/s 4096x2048@30
#level_idc = 51
# overscan = <N>
# vidformat = <N>
# fullrange | nofullrange
# colorprim = <N>
# transfer = <N>
# colmatrix = <N>
# chroma_loc = <N>
# Set H.264 VUI properties. See the source code for details.
#overscan = 0
#vidformat = 5
#nofullrange
#colorprim = 2
#transfer = 2
#colmatrix = 2
#chroma_loc = 0
########################
# Bitstream parameters #
########################
# frameref = <N>
# Specifies the maximum number of reference frames to use (1-16).
#frameref = 1
# keyint_min = <N>
# keyint_max = <N>
# Specify the minimum and maximum keyframe intervals.
#keyint_min = 25
#keyint_max = 250
# scenecut = <N>
# Specifies the scene change detection threshold as a percentage
# (0-100), or -1 to disable.
#scenecut = 40
# bframes = <N>
# Specifies the number of B-frames between two reference frames (0-16).
#bframes = 0
# b_adapt | nob_adapt
# Specifies whether or not to use adaptive B-frame encoding.
#b_adapt
# b_bias = <N>
# Influences how often B-frames are used. <N> is from -90 to 100
# inclusive.
#b_bias = 0
# b_pyramid | nob_pyramid
# Specifies whether to allow B-frames to be used as references.
#nob_pyramid
# deblock | nodeblock
# Selects whether to use the deblocking filter.
# deblockalpha = <A>
# deblockbeta = <B>
# Specify parameters for the deblocking filter. <A> and <B> are
# between -6 and 6 inclusive.
#deblock
#deblockalpha = 0
#deblockbeta = 0
# cabac | nocabac
# Selects whether to use CABAC (context-adaptive binary arithmetic
# coding).
# cabac_init_idc = <N>
# Specifies an internal CABAC parameter.
#cabac
#cabac_init_idc = 0
# cqm = <N>
# Specifies the type of quantization matrices to use:
# 0: Flat matrices
# 1: JVT matrices
# 2: Custom matrices
# cqm_file = <path>
# Specifies the pathname for the custom matrix file with "cqm 2".
#cqm = 0
#cqm_file = /dev/null
###############################
# Encoder analyzer parameters #
###############################
# 8x8dct | no8x8dct
# Specifies whether to allow integer 8x8 DCT transforms.
#no8x8dct
# weight_b | noweight_b
# Specifies whether to use implicit weighting for B-frames.
#noweight_b
# direct_pred = <N>
# Selects the type of motion vector (MV) prediction to use:
# 0: none, 1: spatial, 2: temporal, 3: auto
#direct_pred = 1
# direct_8x8 | nodirect_8x8
# Specifies whether to DISallow 4x4 direct partitions. Default depends
# on level_idc.
#nodirect_8x8
# chroma_qp_offset = <N>
# Specifies the QP offset between chroma and luma (-12 to +12).
#chroma_qp_offset = 0
# me = <N>
# Selects the motion estimation algorithm to use:
# 0: diagonal search, radius 1 (fast)
# 1: hexagonal search, radius 2
# 2: uneven multi-hexagon search
# 3: exhaustive search (slow)
#me = 1
# me_range = <N>
# Specifies the motion estimation search range (from the predicted MV),
# 4 to 64 inclusive.
#me_range = 16
# mv_range = <N>
# Specifies the maximum length of a motion vector, 32-2048 pixels.
# Default depends on level_idc.
#mv_range = 512
# subq = <N>
# Specifies the subpixel motion estimation quality, from 1 (fastest)
# to 7 (best).
#subq = 5
# chroma_me | nochroma_me
# Specifies whether to use chroma in motion estimation.
#chroma_me
# mixed_refs | nomixed_refs
# Specifies whether to allow macroblock partitions in P-frames to have
# individual references.
#nomixed_refs
# trellis = <N>
# Specifies whether to use trellis RD quantization. Requires CABAC.
# <N> is one of:
# 0: disabled
# 1: enabled only for final encoding of a macroblock
# 2: enabled for all mode decisions
#trellis = 0
# fast_pskip | nofast_pskip
# Specifies whether to use early SKIP detection for P-frames.
#fast_pskip
# dct_decimate | nodct_decimate
# Specifies whether to use transform coefficient thresholding on P-frames.
#dct_decimate
# nr = <N>
# Specifies noise reduction level (0-65536).
#nr = 0
# psnr | nopsnr
# ssim | nossim
# Specify whether to calculate PSNR/SSIM statistics (consumes some CPU
# time).
#psnr
#ssim
###########################
# Rate control parameters #
###########################
# qp_min = <N>
# qp_max = <N>
# Specify the minimum and maximum allowed QP values (0-51, 0=lossless).
# qp_step = <N>
# Specifies the maximum difference between QP in consecutive frames.
#qp_min = 10
#qp_max = 51
#qp_step = 4
# crf = <N>
# Specifies the nominal QP for 1-pass VBR encoding.
#crf = 0
# ratetol = <N>
# Specifies the allowed variance from the average bitrate.
#ratetol = 1.0
# vbv_maxrate = <N>
# Specifies the maximum allowed local bitrate, in kbit/s.
#vbv_maxrate = 0
# vbv_bufsize = <N>
# Specifies the size of the VBV buffer for CBR encoding, in kbit.
#vbv_bufsize = 0
# vbv_init = <N>
# Specifies the initial occupancy of the VBV buffer as a decimal value.
#vbv_init = 0.9
# ip_ratio = <N>
# Specifies the QP ratio between I-frames and P-frames.
#ip_ratio = 1.4
# pb_ratio
# Specifies the QP ratio between P-frames and B-frames.
#pb_ratio = 1.3
# rc_eq = <string>
# Specifies the rate control equation.
#rc_eq = blurCplx^(1-qComp)
# qcomp = <N>
# Specifies the QP curve compression ratio. 0.0 gives constant bitrate
# encoding, while 1.0 gives constant quality encoding.
#qcomp = 0.6
# cplx_blur = <N>
# Specifies the amount by which to blur complexity before QP compression.
#cplx_blur = 20.0
# qblur = <N>
# Specifies the amount by which to blur the QP value after QP compression.
#qblur = 0.5
# zones = <string>
# Specifies exceptions to the rate control handling for particular
# frame ranges. The string is a slash-separated sequence of zones,
# where each zone takes the form "start-frame,end-frame,option".
# "start-frame" and "end-frame" define the zone, and "option" is one of:
# q=<QP>: force QP to <QP> (0-51)
# b=<factor>: multiply bitrate by <factor> (decimal value)
#zones = 0,100,q=10/200,300,b=1.5
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