$ ffmpeg -rtsp_transport tcp -i rtsp://user:pass@71.185.124.195:554/c1/b1558830329/e1558830339/replay/ -vcodec copy -y test_clip.mp4

ffmpeg version 3.4.6-0ubuntu0.18.04.1 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 7 (Ubuntu 7.3.0-16ubuntu3)
  configuration: --prefix=/usr --extra-version=0ubuntu0.18.04.1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --enable-gpl --disable-stripping --enable-avresample --enable-avisynth --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --enable-libcdio --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme --enable-libgsm --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse --enable-librubberband --enable-librsvg --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libssh --enable-libtheora --enable-libtwolame --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzmq --enable-libzvbi --enable-omx --enable-openal --enable-opengl --enable-sdl2 --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-libopencv --enable-libx264 --enable-shared
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Guessed Channel Layout for Input Stream #0.1 : mono
Input #0, rtsp, from 'rtsp://admin:strawberryfluff1@71.85.104.195:554/c1/b1558830329/e1558830339/replay/':
  Metadata:
    title           : ONVIF RTSP Server
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: h264 (High), yuvj420p(pc, bt709, progressive), 1920x1080, 30 fps, 30 tbr, 90k tbn, 60 tbc
    Stream #0:1: Audio: pcm_mulaw, 8000 Hz, mono, s16, 64 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:1 -> #0:1 (pcm_mulaw (native) -> aac (native))
Press [q] to stop, [?] for help
[aac @ 0x55b71ce31900] Too many bits 8832.000000 > 6144 per frame requested, clamping to max
Output #0, mp4, to 'test_clip.mp4':
  Metadata:
    title           : ONVIF RTSP Server
    encoder         : Lavf57.83.100
    Stream #0:0: Video: h264 (High) (avc1 / 0x31637661), yuvj420p(pc, bt709, progressive), 1920x1080, q=2-31, 30 fps, 30 tbr, 90k tbn, 90k tbc
    Stream #0:1: Audio: aac (LC) (mp4a / 0x6134706D), 8000 Hz, mono, fltp, 48 kb/s
    Metadata:
      encoder         : Lavc57.107.100 aac
[mp4 @ 0x55b71ce17e00] Non-monotonous DTS in output stream 0:0; previous: 18000, current: 3000; changing to 18001. This may result in incorrect timestamps in the output file.
[mp4 @ 0x55b71ce17e00] Non-monotonous DTS in output stream 0:0; previous: 18001, current: 6000; changing to 18002. This may result in incorrect timestamps in the output file.
[mp4 @ 0x55b71ce17e00] Non-monotonous DTS in output stream 0:0; previous: 18002, current: 9000; changing to 18003. This may result in incorrect timestamps in the output file.
[mp4 @ 0x55b71ce17e00] Non-monotonous DTS in output stream 0:0; previous: 18003, current: 12000; changing to 18004. This may result in incorrect timestamps in the output file.
[mp4 @ 0x55b71ce17e00] Non-monotonous DTS in output stream 0:0; previous: 18004, current: 15000; changing to 18005. This may result in incorrect timestamps in the output file.
[mp4 @ 0x55b71ce17e00] Non-monotonous DTS in output stream 0:0; previous: 18005, current: 18000; changing to 18006. This may result in incorrect timestamps in the output file.
frame=   44 fps=0.0 q=-1.0 size=     256kB time=00:00:01.43 bitrate=1463.4kbits/frame=   60 fps= 57 q=-1.0 size=     512kB time=00:00:01.96 bitrate=2132.9kbits/frame=   76 fps= 48 q=-1.0 size=     768kB time=00:00:02.50 bitrate=2516.7kbits/frame=   92 fps= 44 q=-1.0 size=    1024kB time=00:00:03.03 bitrate=2765.6kbits/frame=  108 fps= 41 q=-1.0 size=    1024kB time=00:00:03.56 bitrate=2352.0kbits/[NULL @ 0x55b71cdfa540] SEI type 5 size 2208 truncated at 1944
frame=  123 fps= 39 q=-1.0 size=    1280kB time=00:00:04.06 bitrate=2578.6kbits/frame=  139 fps= 38 q=-1.0 size=    1536kB time=00:00:04.60 bitrate=2735.5kbits/frame=  155 fps= 37 q=-1.0 size=    1536kB time=00:00:05.13 bitrate=2451.3kbits/frame=  171 fps= 36 q=-1.0 size=    1792kB time=00:00:05.66 bitrate=2590.7kbits/frame=  187 fps= 36 q=-1.0 size=    2048kB time=00:00:06.20 bitrate=2706.1kbits/frame=  203 fps= 35 q=-1.0 size=    2304kB time=00:00:06.73 bitrate=2803.2kbits/frame=  219 fps= 35 q=-1.0 size=    2304kB time=00:00:07.26 bitrate=2597.4kbits/frame=  235 fps= 34 q=-1.0 size=    2560kB time=00:00:07.80 bitrate=2688.7kbits/frame=  246 fps= 33 q=-1.0 size=    2560kB time=00:00:08.16 bitrate=2568.0kbits/frame=  267 fps= 34 q=-1.0 size=    3072kB time=00:00:08.86 bitrate=2838.3kbits/frame=  282 fps= 34 q=-1.0 size=    3072kB time=00:00:09.36 bitrate=2686.8kbits/frame=  298 fps= 33 q=-1.0 size=    3328kB time=00:00:09.90 bitrate=2753.9kbits/frame=  314 fps= 33 q=-1.0 size=    3328kB time=00:00:10.43 bitrate=2613.1kbits/^Cspeed=1.11x