On 05/03/2019 07:43, Jing SUN wrote:
> Add docs for libsvt_hevc encoder in encoders.texi and general.texi
>
> Signed-off-by: Jun Zhao <[email protected]>
> Signed-off-by: Huang, Zhengxu <[email protected]>
> Signed-off-by: hassene <[email protected]>
> Signed-off-by: Jing SUN <[email protected]>
> ---
> doc/encoders.texi | 161
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++
> doc/general.texi | 8 +++
> 2 files changed, 169 insertions(+)
>
> diff --git a/doc/encoders.texi b/doc/encoders.texi
> index 29625ba..64ddb2f 100644
> --- a/doc/encoders.texi
> +++ b/doc/encoders.texi
> @@ -1569,6 +1569,167 @@ Set maximum NAL size in bytes.
> Allow skipping frames to hit the target bitrate if set to 1.
> @end table
>
> +@section libsvt_hevc
> +
> +Scalable Video Technology for HEVC encoder (SVT-HEVC encoder) wrapper.
> +
> +This encoder requires the presence of the headers and
> +library during configuration. You need to explicitly configure the
> +build with @code{--enable-libsvthevc}. The library is detected using
> +@command{pkg-config}.
> +
> +For more information about the library see
> +@url{https://github.com/intel/SVT-HEVC.git}.
> +
> +@subsection Options
> +
> +The following FFmpeg global options affect the configurations of the
> +libsvt_hevc encoder.
> +
> +@table @option
> +@item b (@emph{bitrate})
> +Set the bitrate (as a number of bits per second). Default is 7M.
> +
> +@item refs (@emph{ref})
> +Number of reference frames each P-frame can use. The range is from
> @var{0-16}.
> +Default is 0(disabled).
Wouldn't 0 mean that P frames can't exist, so the whole stream must be
intra-only?
> +@item g / @option{gop_size}
> +Set the GOP size. Default is 64.
This doesn't appear to match what is set in the other patch.
> +
> +@item flags +cgop
> +Enable closed GOP.
> +
> +@item qmin (@emph{min-q})
> +Defaults 10
> +
> +@item qmax (@emph{max-q})
> +Defaults 48
> +
> +Set minimum/maximum quantisation values. Valid range is from 0 to 51
> +(Only used when bit rate control mode @option{rc} is set to 0(cqp) mode.
> +Has to be qmax > = qmin).
In the other patch you only set them in VBR mode, not CQP mode.
> +
> +@item profile (@emph{profile})
> +Set profile restrictions. Can assume one of the following possible values:
> +
> +Default is 2 (main10).
> +
> +@table @samp
> +@item main
> +main profile
> +@item main10
> +main10 profile
> +@end table
> +
> +@item level
> +
> +@option{profile} sets the value of @emph{profile_idc} and the
> @emph{constraint_set*_flag}s.
> +@option{level} sets the value of @emph{level_idc}.
The syntax elements named here exist only in H.264, not H.265.
> +
> +The encoder also has its own specific options:
> +
> +@table @option
> +@item vui
> +Enables or disables the vui structure in the HEVC elementary
> +bitstream. 0 = Off, 1 = On. Default is 0 (Off).
> +
> +@item aud (@emph{aud})
> +Enable use of access unit delimiters when set to 1. Default is 0 (Off).
> +
> +@item hielevel
> +Set hierarchical levels. Can assume one of the following possible values:
> +
> +Default is 3 (4level).
> +
> +@table @samp
> +@item flat
> +none hierarchy level
> +@item 2level
> +2-level hierarchy
> +@item 3level
> +3-level hierarchy
> +@item 4level
> +4-level hierarchy
> +@end table
> +
> +@item la_depth
> +Set look-ahead depth, depending on bit rate control mode @option{rc}, when
> +bit rate control mode is set to vbr it's best to set this parameter to be
> +equal to the intra period value (such is the default set by the encoder),
> +when cqp is chosen, then a look ahead is recommended. The range is from
> @var{0-256}.
> +
> +@item intra_ref_type
> +Set intra refesh type. Can assume one of the following possible values:
> +
> +Default is 2 (idr).
> +
> +@table @samp
> +@item cra
> +open group of pictures
> +@item idr
> +closed group of pictures
> +@end table
This option doesn't exist in the other patch.
> +
> +@item preset
> +A preset defining the quality vs density tradeoff point that the
> +encoding is to be performed at.(e.g. 0 is the highest quality mode,
> +12 is the highest density mode). The range is from @var{0-12}. Default is 9.
> +
> +@item tier
> +Set @emph{general_tier_flag}. This may affect the level chosen for the
> stream
> +if it is not explicitly specified. Can assume one of the following possible
> values:
> +
> +Default is 1 (main).
> +
> +@table @samp
> +@item main
> +main tier
> +@item high
> +high tier
> +@end table
> +
> +@item rc
> +Set bit rate control mode. Can assume one of the following possible values:
> +
> +Default is 0 (cqp).
> +
> +@table @samp
> +@item cqp
> +Constant QP (CQP) mode
> +@item vbr
> +Variable Bit Rate (VBR) mode
> +@end table
> +
> +@item qp
> +Initial quantization parameter for the intra pictures used when
> +@option{rc} is cqp mode. The range is from @var{0-51}. Default is 32.
> +
> +@item sc_detection
> +Enables or disables the scene change detection algorithm. Default is 0
> (disable).
> +
> +@item tune
> +Set quality tuning mode. Can assume one of the following possible values:
> +
> +Default is 1 (oq).
> +
> +@table @samp
> +@item sq
> +Visually optimized mode
> +@item oq
> +PSNR / SSIM optimized mode
> +@item vmaf
> +VMAF optimized mode
> +@end table
> +
> +@item bl_mode
> +Enables or disables Random Access Prediction. Default is 0 (disable).
> +@end table
> +
> +@item hdr
> +High dynamic range input. Default is 0 (disable).
> +@end table
> +
> @section libtheora
>
> libtheora Theora encoder wrapper.
> diff --git a/doc/general.texi b/doc/general.texi
> index fe94c40..9863e14 100644
> --- a/doc/general.texi
> +++ b/doc/general.texi
> @@ -126,6 +126,14 @@ The dispatcher is open source and can be downloaded from
> with the @code{--enable-libmfx} option and @code{pkg-config} needs to be
> able to
> locate the dispatcher's @code{.pc} files.
>
> +@section Scalable Video Technology for HEVC
Please keep the sections in this file in alphabetical order.
> +
> +FFmpeg can make use of the SVT-HEVC library for HEVC encoding.
> +
> +Go to @url{https://github.com/intel/SVT-HEVC.git} and follow the instructions
> +for installing the library. Pass @code{--enable-libsvthevc} to configure to
> +enable it.
> +
> @section Kvazaar
>
> FFmpeg can make use of the Kvazaar library for HEVC encoding.
>
- Mark
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