Non-monotonous DTS in output stream

[sana1374]

Summary of the bug:
Hello,
I've created a network with the mininet simulator on ubuntu 14.04lts. In this network, I want to transfer video between two hosts. I used vlc in Sender host and I used ffmpeg in Receiver host. When I run the ffmpeg, I get a lot of these errors:

[avi @ 0x66c1900] Non-monotonous DTS in output stream 0:1; previous: 3497, current: 3480; changing to 3498. This may result in incorrect timestamps in the output file.
[avi @ 0x66c1900] Non-monotonous DTS in output stream 0:1; previous: 3498, current: 3481; changing to 3499. This may result in incorrect timestamps in the output file.
[avi @ 0x66c1900] Non-monotonous DTS in output stream 0:1; previous: 3499, current: 3482; changing to 3500. This may result in incorrect timestamps in the output file.
[avi @ 0x66c1900] Non-monotonous DTS in output stream 0:1; previous: 3500, current: 3483; changing to 3501. This may result in incorrect timestamps in the output file.
[avi @ 0x66c1900] Non-monotonous DTS in output stream 0:1; previous: 3501, current: 3484; changing to 3502. This may result in incorrect timestamps in the output file.

Here is the command used:

ffmpeg -i rtsp://10.0.0.1:8554/test1.sdp -acodec copy -vcodec copy /home/sana/lab/mrp/test1.avi

ffmpeg version N-46170-g63c4a4b0d-static