may be you can change codec (second mp2) to libtwolame, different ffmpegs offer different versions when I query for mp2 encoder
A..... mp2 MP2 (MPEG audio layer 2)
A..... mp2fixed MP2 fixed point (MPEG audio layer 2) (codec mp2)
A..... libtwolame libtwolame MP2 (MPEG audio layer 2) (codec mp2)
from desktop (v 4.4.4)
A....D mp2 MP2 (MPEG audio layer 2)
A....D mp2fixed MP2 fixed point (MPEG audio layer 2) (codec mp2)
from termux (v 6.1)