Hmmm. That message looks suspicious because it should not include the single 
quotes. I wonder if the issue is shell quoting? Perhaps you should try 
replacing single quotes (') with double (") or none at all. I am ignorant of 
99.9% of windows-related stuff, but it looks to me like your shell is passing 
the single quotes onto to ffmpeg, which is choking.

Leo

Yep -  double quotes

ffmpeg -f lavfi -i "movie=mtp_1.mpg[out0+subcc]"  -map s mtp_mpg_j.srt
the above worked

much thanks
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