linux - ffmpeg livestream by ip camera with a problem of DTS

Question

I'm a problem with a code of ffmpeg: ffmpeg -rtsp_transport tcp -i "rtsp://admin:passw@xxxxxxxx.ddns.net:554/live/ch0" -deinterlace -vcodec libx264 -pix_fmt yuv420p -preset medium -s 1920x1080 -b:v 5000k -acodec aac -strict -2 -ar 44100 -threads 6 -qscale 3 -b:a 712000 -bufsize 128k -f flv "rtmp://a.rtmp.youtube.com/live2/key"

It's used for a live streaming by a ip camera, but I have this problem

[flv @ 0x558333a41100] Non-monotonous DTS in output stream 0:1; previous: 73709, current: 73220; changing to 73709. This may result in incorrect timestamps in the output file.
[aac @ 0x558333a0f100] Queue input is backward in time14.43 bitrate=1288.8kbits/s dup=0 drop=5 speed=0.486x
[flv @ 0x558333a41100] Non-monotonous DTS in output stream 0:1; previous: 74591, current: 73614; changing to 74591. This may result in incorrect timestamps in the output file.

who can help me?

Answer 1

Especially in live stream sources there will occasionally happen some "jump"s on timestamps. Why this happens... well there are lots of reasons. Including packet losses.
When this happens this will cause momentary distortion on output. Here FFmpeg tells you a jump has occurred. I consider this is not an error on your side. Just a warning.
As the warning says, FFmpeg already handled it (as correcting the timestamps).