Why does default distfeeds.conf point to 19.07.4 repositories?
Several other references point to 19.07.5. like at bottom of page:

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Powered by LuCI openwrt-19.07 branch (git-20.363.66498-eb2cc80) / OpenWrt 19.07.5 r11257-5090152ae3


I wanted to add ffmpeg, but it requires kmod-sound-core and is unavailable from these default repo.

it is compiled following https://wiki.friendlyarm.com/wiki/index.php/NanoPi_R4S#Compile_FriendlyWrt in directory

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find . -name kmod-sound-core*
./friendlywrt/bin/targets/rockchip-rk3399/generic/packages/kmod-sound-core_4.14.209-1_aarch64_cortex-a53.ipk

But when I try to add as a local repo, it fails on signature

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 added to distfeed.conf:
 src/gz openwrt_repo http://192.168.1.80/openwrt_repo
 
 added apache instruction for path:
 http path [openwrt_repo]  pointed to : /opt/friendlywrt-rk3399/friendlywrt/bin/targets/rockchip-rk3399/generic/packages
 
 executed opkg update:
 Downloading http://192.168.1.80/openwrt_repo/Packages.gz
Updated list of available packages in /var/opkg-lists/openwrt_repo
Downloading http://192.168.1.80/openwrt_repo/Packages.sig
Signature check failed.
Remove wrong Signature file.
 


QUESTION: after following instructions on wiki to compile friendlywrt, what is the most expedient way to access ipk files in ./friendlywrt/bin/targets/rockchip-rk3399/generic/packages?

Addition attempts:
per https://github.com/8devices/carambola2/issues/63 I tried adding the key for this local repo to /etc/opkg/key
-- still failed with same error

on same page it suggested removing "option check_signature" from /etc/opkg.conf
-- this worked. ffmpeg almost installed except for conflicts with libffmpeg-audio-dec, but this is normal "dependency-roulette".