ffmpeg join files from bat

[whs912km]

i need to delete from my video aa.mkv (duration less than 1 hour) unwanted part from 00:01:00 to 00:05:00
then i've make this bat file:

@echo off
ffmpeg -ss 00:00:00 -to 00:01:00 -i "aa.mkv" -c copy "aa_cut_start.mkv"
ffmpeg -ss 00:05:00 -to 01:00:00 -i "aa.mkv" -c copy "aa_cut_end.mkv"

ffmpeg -i "concat:aa_cut_start.mkv|aa_cut_end.mkv" -c copy aa_final.mkv

del "aa_cut_start.mkv"
del "aa_cut_end.mkv"

pause

but ffmpeg show many error like:

[vost#0:0/copy @ 000000000280c840] Non-monotonic DTS; previous: 60083, current: 60042; changing to 60083. This may result in incorrect timestamps in the output file

so, play aa_final.mkv joined part snap for few seconds, then play correctly
joined aa_cut_start.mkv and aa_cut_end.mkv with amazing Clever FFmpeg Gui (thanks to ProWo) final file play without snap

so, my command to joined files is wrong ? how to join fine ?

[whs912km]

great. finally with some search on google, i've discover this wonderful explanation on stackoverflow.com and this solve my issue

(echo file 'aa_cut_start.mkv' & echo file 'aa_cut_end.mkv' )>list.txt

ffmpeg -safe 0 -f concat -i list.txt -c copy aa_final.mkv

del "aa_cut_start.mkv"
del "aa_cut_end.mkv"
del "list.txt"

[rgr]

great. finally with some search on google, i've discover this wonderful explanation on stackoverflow.com and this solve my issue

(echo file 'aa_cut_start.mkv' & echo file 'aa_cut_end.mkv' )>list.txt

ffmpeg -safe 0 -f concat -i list.txt -c copy aa_final.mkv

del "aa_cut_start.mkv"
del "aa_cut_end.mkv"
del "list.txt"

Remember that such a cut will only be made on keyframes.