Thank you for your answer.
I tried 2 ways - with https://github.com/gonzalo-hvega/pvr.sql/releases (gonzalo pvr.sql) + ffmpeg
and second way https://forum.kodi.tv/showthread.php?tid=329991 (siptv recorder) + ffmpeg
i love first gonzalo pvr.sql , using this with linux and kodi, Its just amazing - but if i install exactly same gonzalo pvr.sql to coreelec , then i can but record only one channel as earlyer described.
But both - gonzalo pvr.sql and iptv recorder acted exaclty same
And i dont know why this happening, but i can tell - im not working with ffmpeg first time.
im already more than 3 years using almost daily ffmpeg and kodi, but with coreelec im new.
ffmpeg i used in windows, android, linux.
I even builded years ago my own recording system to home server, with ffmpeg and linux. i using it daily, every time when need record some tv show or movie.
but after i found coreelec for my android box, i would like to start recording with my box , its need less power than server, so it will be less expensive 