title: ffmpeg RTSP MPEG4 to h.264 RTSP not streaming
body: <p>I'm trying to re stream a RTSP feed and convert to h264.</p>
  
  <p>I'm using the following command line:</p>
  
  <pre><code>C:\Users\Martyn&gt;ffmpeg -re -i rtsp://192.168.2.207/VideoInput/1/mpeg4/ -preset ultrafast -vcodec libx264 -tune zerolatency -b:v 900k -f rtsp udp://192.168.0.2:1234
  </code></pre>
  
  <p>The output I get is:</p>
  
  <pre><code>C:\Users\Martyn&gt;ffmpeg -re -i rtsp://192.168.2.207/VideoInput/1/mpeg4/ -preset u
  ltrafast -vcodec libx264 -tune zerolatency -b:v 900k -f rtsp udp://192.168.0.2:1
  234
  ffmpeg version N-87043-gf0f48884b0 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 7.2.0 (Rev1, Built by MSYS2 project)
    configuration:  --enable-avisynth --enable-gcrypt --enable-libmp3lame --enable
  -libopus --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libx265 --
  enable-cuda --enable-cuvid --enable-schannel --disable-w32threads --extra-cflags
  =-DPTW32_STATIC_LIB --extra-libs=-lpthread --extra-libs=-lwsock32 --enable-gpl -
  -disable-debug
    libavutil      55. 74.100 / 55. 74.100
    libavcodec     57.103.100 / 57.103.100
    libavformat    57. 77.100 / 57. 77.100
    libavdevice    57.  7.101 / 57.  7.101
    libavfilter     6.100.100 /  6.100.100
    libswscale      4.  7.103 /  4.  7.103
    libswresample   2.  8.100 /  2.  8.100
    libpostproc    54.  6.100 / 54.  6.100
  Input #0, rtsp, from 'rtsp://192.168.2.207/VideoInput/1/mpeg4/':
    Metadata:
      title           : MC153906N015_Camera_1
    Duration: N/A, start: 0.040000, bitrate: N/A
      Stream #0:0: Video: mpeg4 (Simple Profile), yuv420p, 1920x1080 [SAR 1:1 DAR
  16:9], 25 tbr, 90k tbn, 1k tbc
  Stream mapping:
    Stream #0:0 -&gt; #0:0 (mpeg4 (native) -&gt; h264 (libx264))
  Press [q] to stop, [?] for help
  [libx264 @ 0000000002c422c0] using SAR=1/1
  [libx264 @ 0000000002c422c0] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2
  AVX
  [libx264 @ 0000000002c422c0] profile Constrained Baseline, level 4.0
  [libx264 @ 0000000002c422c0] 264 - core 152 r2851 ba24899 - H.264/MPEG-4 AVC cod
  ec - Copyleft 2003-2017 - http://www.videolan.org/x264.html - options: cabac=0 r
  ef=1 deblock=0:0:0 analyse=0:0 me=dia subme=0 psy=1 psy_rd=1.00:0.00 mixed_ref=0
   me_range=16 chroma_me=1 trellis=0 8x8dct=0 cqm=0 deadzone=21,11 fast_pskip=1 ch
  roma_qp_offset=0 threads=8 lookahead_threads=8 sliced_threads=1 slices=8 nr=0 de
  cimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=0 ke
  yint=250 keyint_min=25 scenecut=0 intra_refresh=0 rc=abr mbtree=0 bitrate=900 ra
  tetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=0
  </code></pre>
  
  <p>How do I know if this is streaming or not? when I try to connect to udp://192.168.0.2:1234 nothing happens.</p>