OSD doesn't work.

I want to add OSD in my project ,so i write a demo and it can show osd ok.But when i add part of osd code to my project source code,

it doesn't work.  I check the log and i think link chain is ok .  Also i think when add OSD  after capture, then the data flow to M3vdieo will be encoded with OSD .Am i right?

I will post log and OSD code  if anyone need.

Thanks.