[FFmpeg-user] Non-monotonous DTS in output stream in concat

[Dani A]

I am concatenating two files and I am getting the below errors. both files are mp4s an

ffmpeg -f concat -i mylist.txt -c copy output.mp4


[mp4 @ 0xbc48a40] Non-monotonous DTS in output stream 0:1; previous: 332800, current: 306700; changing to 332801. This may result in incorrect timestamps in the output file.
[mp4 @ 0xbc48a40] Non-monotonous DTS in output stream 0:1; previous: 332801, current: 307724; changing to 332802. This may result in incorrect timestamps in the output file.
[mp4 @ 0xbc48a40] Non-monotonous DTS in output stream 0:1; previous: 332802, current: 308748; changing to 332803. This may result in incorrect timestamps in the output file.
[mp4 @ 0xbc48a40] Non-monotonous DTS in output stream 0:1; previous: 332803, current: 309772; changing to 332804. This may result in incorrect timestamps in the output file.
[mp4 @ 0xbc48a40] Non-monotonous DTS in output stream 0:1; previous: 332804, current: 310796; changing to 332805. This may result in incorrect timestamps in the output file.
[mp4 @ 0xbc48a40] Non-monotonous DTS in output stream 0:1; previous: 332805, current: 311820; changing to 332806. This may result in incorrect timestamps in the output file.
[mp4 @ 0xbc48a40] Non-monotonous DTS in output stream 0:1; previous: 332806, current: 312844; changing to 332807. This may result in incorrect timestamps in the output file.
[mp4 @ 0xbc48a40] Non-monotonous DTS in output stream 0:1; previous: 332807, current: 313867; changing to 332808. This may result in incorrect timestamps in the output file.
[mp4 @ 0xbc48a40] Non-monotonous DTS in output stream 0:1; previous: 332808, current: 314891; changing to 332809. This may result in incorrect timestamps in the output file.
[mp4 @ 0xbc48a40] Non-monotonous DTS in output stream 0:1; previous: 332809, current: 315915; changing to 332810. This may result in incorrect timestamps in the output file.
[mp4 @ 0xbc48a40] Non-monotonous DTS in output stream 0:1; previous: 332810, current: 316939; changing to 332811. This may result in incorrect timestamps in the output file.
[mp4 @ 0xbc48a40] Non-monotonous DTS in output stream 0:1; previous: 332811, current: 317963; changing to 332812. This may result in incorrect timestamps in the output file.
[mp4 @ 0xbc48a40] Non-monotonous DTS in output stream 0:1; previous: 332812, current: 318987; changing to 332813. This may result in incorrect timestamps in the output file.
[mp4 @ 0xbc48a40] Non-monotonous DTS in output stream 0:1; previous: 332813, current: 320011; changing to 332814. This may result in incorrect timestamps in the output file.
[mp4 @ 0xbc48a40] Non-monotonous DTS in output stream 0:1; previous: 332814, current: 321035; changing to 332815. This may result in incorrect timestamps in the output file.
[mp4 @ 0xbc48a40] Non-monotonous DTS in output stream 0:1; previous: 332815, current: 322059; changing to 332816. This may result in incorrect timestamps in the output file.
[mp4 @ 0xbc48a40] Non-monotonous DTS in output stream 0:1; previous: 332816, current: 323083; changing to 332817. This may result in incorrect timestamps in the output file.
[mp4 @ 0xbc48a40] Non-monotonous DTS in output stream 0:1; previous: 332817, current: 324107; changing to 332818. This may result in incorrect timestamps in the output file.
[mp4 @ 0xbc48a40] Non-monotonous DTS in output stream 0:1; previous: 332818, current: 325131; changing to 332819. This may result in incorrect timestamps in the output file.
[mp4 @ 0xbc48a40] Non-monotonous DTS in output stream 0:1; previous: 332819, current: 326155; changing to 332820. This may result in incorrect timestamps in the output file.
[mp4 @ 0xbc48a40] Non-monotonous DTS in output stream 0:1; previous: 332820, current: 327179; changing to 332821. This may result in incorrect timestamps in the output file.
[mp4 @ 0xbc48a40] Non-monotonous DTS in output stream 0:1; previous: 332821, current: 328202; changing to 332822. This may result in incorrect timestamps in the output file.
[mp4 @ 0xbc48a40] Non-monotonous DTS in output stream 0:1; previous: 332822, current: 329226; changing to 332823. This may result in incorrect timestamps in the output file.
[mp4 @ 0xbc48a40] Non-monotonous DTS in output stream 0:1; previous: 332823, current: 330250; changing to 332824. This may result in incorrect timestamps in the output file.
[mp4 @ 0xbc48a40] Non-monotonous DTS in output stream 0:1; previous: 332824, current: 331274; changing to 332825. This may result in incorrect timestamps in the output file.
[mp4 @ 0xbc48a40] Non-monotonous DTS in output stream 0:1; previous: 332825, current: 332298; changing to 332826. This may result in incorrect timestamps in the output file.