Merge sound wrong duration

[Truong Quoc Khanh]

Summary of the bug:
How to reproduce:
Extract sound from video

-fflags +igndts -i "intro.mp4" -codec:a libmp3lame -vn -ss 00:00 -t 0:00:22.293 -y "intro.mp3"

-fflags +igndts -i "outro.mp4" -codec:a libmp3lame -vn -ss 00:00 -t 0:00:22.293 -y "outro.mp3"

Merge with mp3

-i "concat:intro.mp3|music.mp3|outro.mp3" -codec:a libmp3lame -b:a 321192 -af "adelay=2000|2000" -y "merge.mp3"

Output i need:

[delay 2 sec][intro][music][outro]

Output i got:

[delay 2 sec][intro][empty about 2sec][music][empty about 2sec][outro]

The error (i think):

[mp3 @ 00000296b50115c0] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 1165871 >= 20783

ffmpeg version: ffmpeg-4.3.1-win32-static

How do i fix it, thanks

[Truong Quoc Khanh]

Note for log:
New Process Arg is argument to run ffmpeg
ErrorDataReceived is console error output from process ffmpeg

[Carl Eugen Hoyos]

This has currently very little similarities with a valid ticket: Is lame needed to reproduce the issue or is it also reproducible with a native audio encoder?
Please test current FFmpeg git head, use a normal console without additional messages that make reading the output very difficult, and provide the command line you tested together with the complete, uncut console output and the necessary input sample(s).

[Elon Musk]

Concat protocol is not supposed to work at all with bunch of input formats.

Use concat filter instead when already using filtering.