On Sat, Sep 18, 2021 at 4:27 AM <lance.lmw...@gmail.com> wrote:
>
> From: Limin Wang <lance.lmw...@gmail.com>
>
> Signed-off-by: Limin Wang <lance.lmw...@gmail.com>
> ---
Hi,
"doc/encoders: add available values for libsvtav1 options"
would possibly be better as a commit message?
> doc/encoders.texi | 44 ++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 44 insertions(+)
>
> diff --git a/doc/encoders.texi b/doc/encoders.texi
> index 8fccd73..64d604e 100644
> --- a/doc/encoders.texi
> +++ b/doc/encoders.texi
> @@ -1750,12 +1750,56 @@ You need to explicitly configure the build with
> @code{--enable-libsvtav1}.
> @table @option
> @item profile
> Set the encoding profile.
> +@table @samp
> +@item main
> +@item high
> +@item professional
> +@end table
>
> @item level
> Set the operating point level.
> +@table @samp
> +@item 2.0
> +@item 2.1
> +@item 2.2
> +@item 2.3
> +@item 3.0
> +@item 3.1
> +@item 3.2
> +@item 3.3
> +@item 4.0
> +@item 4.1
> +@item 4.2
> +@item 4.3
> +@item 5.0
> +@item 5.1
> +@item 5.2
> +@item 5.3
> +@item 6.0
> +@item 6.1
> +@item 6.2
> +@item 6.3
> +@item 7.0
> +@item 7.1
> +@item 7.2
> +@item 7.3
> +@end table
> +
The levels list is somewhat long, and it's specific to AV1 and not
this encoder. I don't think we list H.264/HEVC etc levels, either?
So I'm not 100% sure on this bit, possibly just noting "Set the
operating point level, f.ex. '4.0'." is good enough?
> +@item hielevel
> +Set the Hierarchical prediction levels.
> +@table @samp
> +@item 3level
> +@item 4level, This is the default.
You probably mean this to be on a separate line. Right now it ends up
as part of the entry on the list a la: ‘4level, This is the default.’
Noticed through the HTML documentation output (ffmpeg-codecs.html).
> +@end table
>
> @item tier
> Set the operating point tier.
> +@table @samp
> +@item main
> +The main tier was designed for most applications. This is the default.
> +@item high
> +The high tier was designed for very demanding applications.
> +@end table
>
Looking at https://aomediacodec.github.io/av1-spec/av1-spec.pdf , it
seems like the high tier only enable higher bit rates/lower
compression ratios in levels.
I think explaining it like that is probably more understandable than
vague references for "most applications" and "very demanding
applications". Or only explaining which one is the default, as I would
expect a person who needs to set this flag to know what the tier flags
in AV1 bit stream mean.
Jan
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