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как образец можно взять скрипт, который генерирует SVP 3.0 (?) (НЕ 3.1) при включенной подсветке полей, оно там как раз делалось сугубо на уровне скрипта

фигурная разрезка-ресайз-склейка

> Просто подобных BD с разным соотношением сторон не единичные случаи, и такая обработка была-бы очень полезна.

afaik, bd "с разным соотношением сторон" обычно делаются не тупой обрезкой, а более интеллектуально, т.е. кадр вырезается из разных мест полного кадра, в зависимости от сцены

Ok, here's time to run some hwdec-related tests myself

Mac Mini 2014 equipped with Core i5-4278U (2.5 GHz up to 3.0 (?)) and Iris GPU, which is definitely faster than any Core-m7.
macOS 10.12.1

Comparing CPU load with different "hwdec" values: off vs. auto-copy
SVP is OFF in all cases

1080p h264: 12% at 2.8-3.0 GHz vs. 6% at 2.5 GHz
1080p + Hi10p: 15% at 2.8-3.0 GHz in both modes
2160p h264: 35-50% at 3.0 GHz vs. 12% at 2.5 GHz

"hwdec=auto" selects a non-"copy" decoder which isn't compatible with SVP, as a result video will remain at 24 fps while SVP won't show any error.
What you need is

hwdec=auto-copy

>  but even in the middle point (which was what svp suggested after running the initial test)

that "middle point" is not absolute and depends on the perf. test results

due to your hw ...hmmm... specialty - i.e passive cooling system and very high turbo boost level - the quick benchmark may give much higher perf. level that the system can maintain on a long period of time
so you probably need to move the slider to the right from the middle position and monitor the actual CPU frequencies via Intel Power Gadget

if "SVP index" stays at 1.0 and CPU load is not higher than ~70% then your're good

> Is it possible that your installer only creates the plugins folder if I pick one or more players?

yeah, obviously it installs only what is needed
avs 32-bit plugins <=> directshow 32-bit players
avs 64-bit plugins <=> directshow 64-bit players
vs 64-bit plugins <=> mpv || libmpv || vlc
vlc 64-bit plugin <=> vlc

luckily for you there's a per-component installation option

You can try it yourself by playing it in Stereoscopic Player
Most likely you'll get a desync by several frames between left and right views...

this's the previous build that was linked with 3.4m

>  I am still getting the Frame server (64-bit) NOT FOUND message

restart the SVP Manager after changing PATH value

> Also, things don't look good in my log.

only thing that is not "good" here is
> [v][vd] Using software decoding.
while trying to play 4K

Actually, this's interesting

PMP seems to ignore "hwdec" option given in mpv.conf, it only uses "hardware_decoding" value from plexmediaplayer.conf file.
When it's set to "true" PMP passes "hwdec=auto" to mpv engine, and it selects "best" video decoder BUT not the "*-copy" one => SVP is not working.

So we need to find the way to force some specific "hwdec" value, i.e. "hwdec=d3d11va-copy" in the PMP,
OR turn hw decoding off via plexmediaplayer.conf.

let's stick to one thread about this
http://www.svp-team.com/forum/viewtopic.php?id=3693

it needs "libpython3.5m.so.1"

$ ldd extensions/libPythonQt.so 
    linux-vdso.so.1 =>  (0x00007ffec79f9000)
    libpython3.5m.so.1.0 => /usr/lib/x86_64-linux-gnu/libpython3.5m.so.1.0 (0x00007f56f471b000)
    ...

>  Шесть ядер дают мне возможность делать всё силами процессора

да, но в принципе там и качество ниже ("пиксельнее"), и плавность хуже

> И получу на выходе 12 потоков. Полагаю, этого гарантированно хватит даже для плавного воспроизведения настоящего 4К-видео

не хватит

I really have no idea why all this Python-based stuff is not working on your system.
You can try with a clean Windows installation (e.g. in a VM)