[Cin] Suggestion: improve presets for VP9 webm

[Miroslav Rovis]

On 220925-09:05+0300, Andrew Randrianasulu wrote:
> вс, 25 сент. 2022 г., 08:25 Miroslav Rovis via Cin <
> cin at lists.cinelerra-gg.org>:
> 
> > I changed the subject line: 's/setting/presets/'.
> >
> > On 220924-17:55-0600, Phyllis Smith wrote:
> > > From my quick read, it sounds like a thorough analysis and
> > > great suggestion.
[...]
> >
> > > On Sat, Sep 24, 2022 at 3:32 PM Miroslav Rovis via Cin <
> > > cin at lists.cinelerra-gg.org> wrote:
[...]
> > > > So, when using the setting in the render window, I figured
> > > > out that there are better settings to use than the presets
> > > > that are offered. And they are simpler too.
> >
> 
> settings live in ${cin_src_root}/ffmpeg/video

which read:

$ cat /mnc/src_n0/Cin/cinelerra/cinelerra-5.1/ffmpeg/video/vp9_1920x1080_24or25or30fps.webm 
webm libvpx-vp9
# 20171119-2100
# based on https://developers.google.com/media/vp9/settings/vod/
# for explanations reference the Cinelerra Manual
# 1920x1080 (24, 25 or 30 frames per second)
b=1800k
minrate=900k
maxrate=2610k
tile-columns=2
g=240
threads=8
quality=good
crf=31
speed=4
$

Yes, that's what I (in the render window) used to change to:

$ cat /mnc/src_n0/Cin/cinelerra/cinelerra-5.1/ffmpeg/video/vp9_1920x1080_24or25or30fps.webm 
webm libvpx-vp9
# 20171119-2100
# based on https://developers.google.com/media/vp9/settings/vod/
# for explanations reference the Cinelerra Manual
# 1920x1080 (24, 25 or 30 frames per second)
b=0
tile-columns=2
g=40
threads=8
crf=31
speed=4
row-mt=1
$

(all the above still from memory, but I'm soon to work as I
proposed.)

I'm not sure speed=4 and tile-columns=2
help/hurt/make-no-differenc., but I usually leave them as they
were.
> 
> and yeah, no row-mt=1 there apart from av1 profile.
> I only have asymmetric arm 8 core in tablet, and two 4 x86-64 cores in
> desktop and laptop for testing....
That's slow, I don't have a laptop, but I had desktops in such
range. It's maybe half an order of magnitude more slowly to work
motion plugins with such than what I have. (I went nearly broke,
and with all of my savings gone to get me those, and I'm still
recovering.)

> > Because in this wiki page:
> > > > In essence, the Wiki page for VP9 can tell you all:
> > > > https://trac.ffmpeg.org/wiki/Encode/VP9 [*]
> > previously there were recommendation on VP9 that correspond with
> > the current presets in Cinelerra. The current version of VP9
> > wiki page is, I believe, just a few months old.
> >
> > With the presets that I find in current Cinelerra; I'm yet to
> > open it today and work with it, but I choose preset that are
> > recommended for 1920x1080 30fps and then edit it as below.
> > > > I have no rendering, actually no Cinelerra opened right now,
> > > > so, from memory:
> > > >
> > > > It's just b=0, then add crf=31 (or other number), and then
> > > > row-mt=1, and remove the min and max settings from the
> > > > preset.
[...]

-- 
Miroslav Rovis
Zagreb, Croatia
https://www.CroatiaFidelis.hr
my PGP-key:
https://www.croatiafidelis.hr/FCF13245ED247DCE443855B7EA9884884FBAF0AE.asc
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