ffmpeg -i "rtsp://root:root@192.168.13.104/axis-media/media.amp?camera=1" -i "rtsp://root:root@192.168.13.104/axis-media/media.amp?camera=2" -i "rtsp://root:root@192.168.13.104/axis-media/media.amp?camera=3" -filter_complex "[0:v][1:v][2:v]hstack=inputs=3[v]" -map "[v]" out.mp4

[rtsp @ 0xd4eca42a00] max delay reached. need to consume packetA dup=0 drop=136 speed=1.16x
[rtsp @ 0xd4eca42a00] RTP: missed 5 packets
[rtsp @ 0xd4eca42a00] max delay reached. need to consume packetA dup=0 drop=137 speed=1.15x
[rtsp @ 0xd4eca42a00] RTP: missed 4 packets
[h264 @ 0xd4ecbb3520] error while decoding MB 14 15, bytestream -21
[h264 @ 0xd4ecbb3520] concealing 1185 DC, 1185 AC, 1185 MV errors in P frame

[null @ 0x76afb1a060] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 1 >= 1
    Last message repeated 1 times
[null @ 0x76afb1a060] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 2 >= 2
[null @ 0x76afb1a060] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 3 >= 3
[null @ 0x76afb1a060] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 4 >= 4
    Last message repeated 1 times
[null @ 0x76afb1a060] Application provided invalid, non monotonically increasing dts to muxer in stream 0: 5 >= 5
    Last message repeated 1 times

Past duration 0.999992 too large
    Last message repeated 7 times
Past duration 0.999947 too large
Past duration 0.999992 too large

pkt_pts=1012502
pkt_pts_time=0:00:11.250022
pkt_dts=1012502
pkt_dts_time=0:00:11.250022
best_effort_timestamp=1012502
best_effort_timestamp_time=0:00:11.250022
pkt_duration=N/A
pkt_duration_time=N/A
pkt_pos=N/A