support chunk size select for chunk-hopping encoder

haoneng.lhn

2023-09-11 e60ac4bc991183a780fdd03d22db7d3b42df9b58

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peme    p.m.
pe eme    p.m.
p m    p.m.
pm    p.m.
p.m.
p.m    p.m.
ame    a.m.
a eme    a.m.
am    a.m.
a.m.
a.m    a.m.
a m    a.m.