​​I've been trying to use ffmpeg to download video from certain websites but 
always encounter the warning "Non-monotonous DTS in output stream" when 
downloading. The saved video file won't play correctly beyond a certain point 
in the file. It appears that the websites use a mpegts container and ffmpeg 
downloads a long list of these files. After the first group downloads, and a 
new group ​begins, the warnings begin to appear. Another user stated "Some 
playlists contain a sequence of separately produced MPEG-TS files. So, there's 
a timestamp reset when each new segment is received. At this point, the 
timestamp code in libavformat's mux.c simply increments the output timestamp by 
one when this happens. Unless the timebase resolution is 1/fps, this produces 
an unsound file." Is there a way in ffmpeg to properly concatenate these? I've 
been trying to find a fix for over a year and tried various workarounds but 
nothing works.
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