yt-dlp.exe was used.
LAV Filters was installed, with an option for GOM's internal codec to be used or not to be used.
gom player v5270.exe has not been working for youtube's webm format since few weeks ago.
all 2 hour long youtube's current webms still work with gom player v5270, and all the old webms prior to 3 weeks ago work.
but all others 1 min to 20 min new youtube webm videos are not working.

the newest gom player v5370.exe works with youtube's current webm format.
new youtube's webms are still working with very OLD Mplayerclassic V6.490.exe, mpc-hc64.exe and MPV.exe

there is no way i will use the gom player v5370 and higher.exe, because
old gom player v5270.exe has 100s options
the newest gom player v5370-ish.exe now has about 5 options or so. it is not the same, it is a garbage now.


i suspect something in GOM or something in LAV filters are not communicating
would you give me some pointers or any pointers then i would flip some switches and settings here and there.
or maybe if there is a different filter software that does not install codecs all over the windows OS, i will try that too