title: Streaming trouble, ffmpeg unable to find a suitable output format
body: <p>FFMPEG for some odd reason won't allow me to output a stream, it's odd because I have two computers available and one, which had low CPU was having trouble decoding but the stream worked, so I switched my network cables and I have tried transcoding with the same command and it will not output a stream.</p>
  
  <p>My command reads </p>
  
  <pre><code>ffmpeg -i udp://@xxx.x.x.xx.xxxx -f mpegts udp://@xxx.x.x.xx.xxxx
  </code></pre>
  
  <p>I also tried </p>
  
  <pre><code>ffmpeg -i udp://@xxx.x.x.xx.xxxx udp://@xxx.x.x.xx.xxxx
  </code></pre>
  
  <p>The error reads </p>
  
  <pre><code>[NULL @ 000001c95eeb2600] Unable to find a suitable output format for udp://@xxx.x.x.xx.xxxx'
  udp://@xxx.x.x.xx.xxxx: Invalid argument"
  </code></pre>
  
  <p>full log</p>
  
  <pre><code>C:\Users\xxx\Downloads\Installations\FFMPEG\bin&gt;ffmpeg -i udp://@xxx.x.x.xx:xxxx -f mpegts udp://@xxx.x.x.xx.xxxx
  ffmpeg version 4.0.2 Copyright (c) 2000-2018 the FFmpeg developers
    built with gcc 7.3.1 (GCC) 20180722
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth
    libavutil      56. 14.100 / 56. 14.100
    libavcodec     58. 18.100 / 58. 18.100
    libavformat    58. 12.100 / 58. 12.100
    libavdevice    58.  3.100 / 58.  3.100
    libavfilter     7. 16.100 /  7. 16.100
    libswscale      5.  1.100 /  5.  1.100
    libswresample   3.  1.100 /  3.  1.100
    libpostproc    55.  1.100 / 55.  1.100
  [h264 @ 000001c3a9dff900] non-existing SPS 0 referenced in buffering period
  [h264 @ 000001c3a9dff900] SPS unavailable in decode_picture_timing
  [h264 @ 000001c3a9dff900] non-existing PPS 0 referenced
  [h264 @ 000001c3a9dff900] non-existing SPS 0 referenced in buffering period
  [h264 @ 000001c3a9dff900] SPS unavailable in decode_picture_timing
  [h264 @ 000001c3a9dff900] non-existing PPS 0 referenced
  [h264 @ 000001c3a9dff900] decode_slice_header error
  [h264 @ 000001c3a9dff900] no frame!
  [h264 @ 000001c3a9dff900] non-existing SPS 0 referenced in buffering period
  [h264 @ 000001c3a9dff900] SPS unavailable in decode_picture_timing
  [h264 @ 000001c3a9dff900] non-existing PPS 0 referenced
  [h264 @ 000001c3a9dff900] non-existing SPS 0 referenced in buffering period
  [h264 @ 000001c3a9dff900] SPS unavailable in decode_picture_timing
  [h264 @ 000001c3a9dff900] non-existing PPS 0 referenced
  [h264 @ 000001c3a9dff900] decode_slice_header error
  [h264 @ 000001c3a9dff900] no frame!
  [h264 @ 000001c3a9dff900] non-existing SPS 0 referenced in buffering period
  [h264 @ 000001c3a9dff900] SPS unavailable in decode_picture_timing
  [h264 @ 000001c3a9dff900] non-existing PPS 0 referenced
  [h264 @ 000001c3a9dff900] non-existing SPS 0 referenced in buffering period
  [h264 @ 000001c3a9dff900] SPS unavailable in decode_picture_timing
  [h264 @ 000001c3a9dff900] non-existing PPS 0 referenced
  [h264 @ 000001c3a9dff900] decode_slice_header error
  [h264 @ 000001c3a9dff900] no frame!
  [h264 @ 000001c3a9dff900] non-existing SPS 0 referenced in buffering period
  [h264 @ 000001c3a9dff900] SPS unavailable in decode_picture_timing
  [h264 @ 000001c3a9dff900] non-existing PPS 0 referenced
  [h264 @ 000001c3a9dff900] non-existing SPS 0 referenced in buffering period
  [h264 @ 000001c3a9dff900] SPS unavailable in decode_picture_timing
  [h264 @ 000001c3a9dff900] non-existing PPS 0 referenced
  [h264 @ 000001c3a9dff900] decode_slice_header error
  [h264 @ 000001c3a9dff900] no frame!
  [h264 @ 000001c3a9dff900] non-existing SPS 0 referenced in buffering period
  [h264 @ 000001c3a9dff900] SPS unavailable in decode_picture_timing
  [h264 @ 000001c3a9dff900] non-existing PPS 0 referenced
  [h264 @ 000001c3a9dff900] non-existing SPS 0 referenced in buffering period
  [h264 @ 000001c3a9dff900] SPS unavailable in decode_picture_timing
  [h264 @ 000001c3a9dff900] non-existing PPS 0 referenced
  [h264 @ 000001c3a9dff900] decode_slice_header error
  [h264 @ 000001c3a9dff900] no frame!
  [h264 @ 000001c3a9dff900] non-existing SPS 0 referenced in buffering period
  [h264 @ 000001c3a9dff900] SPS unavailable in decode_picture_timing
  [h264 @ 000001c3a9dff900] non-existing PPS 0 referenced
  [h264 @ 000001c3a9dff900] non-existing SPS 0 referenced in buffering period
  [h264 @ 000001c3a9dff900] SPS unavailable in decode_picture_timing
  [h264 @ 000001c3a9dff900] non-existing PPS 0 referenced
  [h264 @ 000001c3a9dff900] decode_slice_header error
  [h264 @ 000001c3a9dff900] no frame!
  [mpegts @ 000001c3a9dea3c0] PES packet size mismatch
  [h264 @ 000001c3a9dff900] Reference 2 &gt;= 2
  [h264 @ 000001c3a9dff900] error while decoding MB 62 39, bytestream 99129
  [h264 @ 000001c3a9dff900] reference picture missing during reorder
  [h264 @ 000001c3a9dff900] Missing reference picture, default is 65373
  Input #0, mpegts, from 'udp://@xxx.x.x.xx:xxxx':
    Duration: N/A, start: 87772.784411, bitrate: N/A
    Program 4030
      Metadata:
        service_name    : SONY TV HD
        service_provider: BSkyB
      Stream #0:0[0x208]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(tv, bt709, top first), 1920x1080 [SAR 1:1 DAR 16:9], 25 fps, 50 tbr, 90k tbn, 50 tbc
      Stream #0:1[0x281](eng): Audio: ac3 ([6][0][0][0] / 0x0006), 48000 Hz, 5.1(side), fltp, 384 kb/s
      Stream #0:2[0x243](eng): Subtitle: dvb_teletext ([6][0][0][0] / 0x0006)
  [udp @ 000001c3aa7aaa00] getaddrinfo(xxx.x.x.xx.xxxx, 0): The name does not resolve for the supplied parameters
  udp://@xxx.x.x.xx.xxxx: I/O error
  </code></pre>