FFMPEG: Output file ending timestamp is incorrect. File keeps playing beyon

[BillyP]

EDIT - SOLUTION FOUND :I changed output container to m4a & problem's solved!

Got the idea from 4th comment of top answer here: https://stackoverflow.com/questions/9913032/how-can-i-extract-audio-from-video-with-ffmpeg

Not really well versed with codecs & stuff, I was using aac container as original MP4 showed it contained an AAC codec in the audio track.

ORIGINAL QUESTION:

Hi all, trying to use ffmpeg to batch process multiple files, but faltering at the very first step. Below problem happens with multiple input files.

Output file should be: 12m10s duration. Actual turns out to be: 11m19s duration.

But actual file keeps playing beyond 11m19s even though timestamp halts there. So cutting is done properly, just the ending timestamp is wrong.

FFMPEG command I run (to extract audio from a big file): `ffmpeg -f concat -i input.txt -vn -acodec copy out.aac`

input.txt:

file 'input.mp4'
inpoint 40:45
outpoint 47:02
file 'input.mp4'
inpoint 47:19
outpoint 48:24
file 'input.mp4'
inpoint 49:43
outpoint 52:42
file 'input.mp4'
inpoint 52:53
outpoint 54:42

Get a bunch of "application provided invalid non monotonically increasing dts to muxer in stream" warnings. Any ideas how to fix? Thank you.

FFMPEG full log: [https://pastebin.com/m9iHgz8P](https://pastebin.com/m9iHgz8P)

input.mp4 metadata: [https://pastebin.com/S2GmMgz9](https://pastebin.com/S2GmMgz9)

FFMPEG version - 4.2