FFmpeg progress report

Installed nginx to monitor FFmpeg progress.


ffmpeg -f rawvideo -s 16x16 -r 1 -re -i /dev/zero -r 1 -f null -progress http://127.0.0.1:80/  /dev/null
ffmpeg version 2.2.1 Copyright (c) 2000-2014 the FFmpeg developers
  built on Apr 19 2014 15:42:41 with gcc 4.1.2 (GCC) 20080704 (Red Hat 4.1.2-52)
  configuration: --prefix=/home/dennisp/010_64 --enable-static --enable-postproc --enable-gpl --enable-avfilter --enable-libx264 --enable-libxvid --enable-libmp3lame --enable-libfdk-aac --enable-pthreads --enable-swscale --enable-runtime-cpudetect --disable-devices --disable-avdevice --extra-ldflags=-static --disable-shared --enable-bzlib --enable-zlib --extra-libs='-lx264 -lxvidcore -lmp3lame -lpthread -lm -lbz2 -lz -lpthread -lvpx -lass -lfontconfig -lexpat -lfreetype -lfdk-aac' --disable-encoder=libgsm --disable-decoder=libgsm --disable-doc --enable-libvpx --enable-libass --enable-version3 --enable-nonfree --enable-libfreetype
  libavutil      52. 66.100 / 52. 66.100
  libavcodec     55. 52.102 / 55. 52.102
  libavformat    55. 33.100 / 55. 33.100
  libavfilter     4.  2.100 /  4.  2.100
  libswscale      2.  5.102 /  2.  5.102
  libswresample   0. 18.100 /  0. 18.100
  libpostproc    52.  3.100 / 52.  3.100
Input #0, rawvideo, from '/dev/zero':
  Duration: N/A, start: 0.000000, bitrate: 3 kb/s
    Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 16x16, 3 kb/s, 1 fps, 1 tbr, 1 tbn, 1 tbc
Output #0, null, to '/dev/null':
  Metadata:
    encoder         : Lavf55.33.100
    Stream #0:0: Video: rawvideo (I420 / 0x30323449), yuv420p, 16x16, q=2-31, 200 kb/s, 90k tbn, 1 tbc
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo -> rawvideo)
Press [q] to stop, [?] for help
[null @ 0x3401900] Encoder did not produce proper pts, making some up.
frame=   17 fps=1.1 q=0.0 Lsize=N/A time=00:00:17.00 bitrate=N/A
video:2kB audio:0kB subtitle:0 data:0 global headers:0kB muxing overhead -101.348038%
Received signal 2: terminating.



can't see nay traffic on port 80 nor dst 127.0.0.1:

$tcpdump src 127.0.0.1
tcpdump: WARNING: eth0: no IPv4 address assigned
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on eth0, link-type EN10MB (Ethernet), capture size 65535 bytes
^C
0 packets captured
4 packets received by filter
0 packets dropped by kernel



How can I see the web traffic from FFmpeg?