@echo off

rem === input ===
set input="in.mp4"
set output="out.mp4"
set start=10
set end=20
set overlay="[0:v][1:v]overlay=10:10"

rem === get video duration ===
ffprobe -v error -show_entries format=duration -of "default=nw=1:nk=1" %input% > temp.txt
set /p duration=<temp.txt
set /p tduration=<temp.txt
set /A "tduration-=%start%+%end%"

ffmpeg -i %input% -i logo.png -t %start% -filter_complex %overlay% -y part_start.mp4
ffmpeg -sseof -%end% -i %input% -i logo.png -filter_complex %overlay% -y part_end.mp4
ffmpeg -i %input% -ss %start% -t %tduration% -c copy -y part_middle.mp4
echo file 'part_start.mp4' > temp.txt
echo file 'part_middle.mp4' >> temp.txt
echo file 'part_end.mp4' >> temp.txt
ffmpeg -f concat -safe 0 -i temp.txt -c copy -y %output%
del temp.txt