RTSP DESCRIBE without a User-Agent causes some IP Cameras to close the connection

[imavra]

Summary of the bug:

When connecting via RTSP, the IP Cam IcyBox IB-CAM2002 closes the connection when ffmpeg sends a DESCRIBE without a User-Agent. This causes issues with CCTV software such as ZoneMinder that use ffmpeg.

How to reproduce:

% ffprobe.exe rtsp://192.168.0.220:554/stream1/ 

I can provide access to devs if needed, although problem seems straightforward.

[imavra]

Wireshark captures packets

[imavra]

FFMPEG:

OPTIONS rtsp://192.168.0.220:554/stream1/ RTSP/1.0
CSeq: 1

DESCRIBE rtsp://192.168.0.220:554/stream1/ RTSP/1.0
Accept: application/sdp
CSeq: 2

LibVLC:

OPTIONS rtsp://192.168.0.220:554/stream1/ RTSP/1.0
CSeq: 2
User-Agent: LibVLC/2.0.7 (LIVE555 Streaming Media v2012.12.18)

DESCRIBE rtsp://192.168.0.220:554/stream1/ RTSP/1.0
CSeq: 3
User-Agent: LibVLC/2.0.7 (LIVE555 Streaming Media v2012.12.18)
Accept: application/sdp

[Carl Eugen Hoyos]

Is the problem only reproducible with ffprobe or also with ffmpeg? (Please only report problems against ffprobe if they are not reproducible with another tool.)
Please provide the failing command line (ffmpeg -i rtsp://192.168.0.220:554/stream1/ together with the complete, uncut console output to make this a valid ticket.

[imavra]

From windows:

D:\Stuff\bin>ffmpeg -i rtsp://192.168.0.220:554/stream1/
ffmpeg version N-54499-g63d7684 Copyright (c) 2000-2013 the FFmpeg developers
  built on Jul  6 2013 10:30:06 with gcc 4.7.3 (GCC)
  configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  libavutil      52. 38.100 / 52. 38.100
  libavcodec     55. 18.102 / 55. 18.102
  libavformat    55. 11.101 / 55. 11.101
  libavdevice    55.  2.100 / 55.  2.100
  libavfilter     3. 78.102 /  3. 78.102
  libswscale      2.  3.100 /  2.  3.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  3.100 / 52.  3.100
rtsp://192.168.0.220:554/stream1/: Invalid data found when processing input

From ubuntu linux:

functor@ichigo:~$ ffmpeg -i rtsp://192.168.0.220:554/stream1/
ffmpeg version 0.8.6-6:0.8.6-1ubuntu2, Copyright (c) 2000-2013 the Libav developers
  built on Mar 30 2013 22:23:21 with gcc 4.7.2
*** THIS PROGRAM IS DEPRECATED ***
This program is only provided for compatibility and will be removed in a future release. Please use avconv instead.
rtsp://192.168.0.220:554/stream1/: Invalid data found when processing input

Same theme on other devices / versions I tried

As I mentioned, I re-injected the packets myself and if you add a User-Agent the camera doesn't close the connection after "DESCRIBE"

Thanks

[Carl Eugen Hoyos]

Unrelated: You may want to read ​http://blog.pkh.me/p/13-the-ffmpeg-libav-situation.html to learn more about the intentionally broken version of FFmpeg that you tested on Ubuntu.

[Carl Eugen Hoyos]

Please test attached patch (completely untested).

[imavra]

Yep the patch works!

Example of avprobe (technically the same patch would work here):

functor@ichigo:~/bin$ ffprobe rtsp://192.168.0.220:554/stream1/
avprobe version 0.8.6-6:0.8.6-1ubuntu2, Copyright (c) 2007-2013 the Libav developers
  built on Mar 30 2013 22:23:21 with gcc 4.7.2
rtsp://192.168.0.220:554/stream1/: Invalid data found when processing input

Example of ffmpeg with your patch:

functor@ichigo:~/bin$ ./ffprobe rtsp://192.168.0.220:554/stream1/
ffprobe version git-2013-07-09-c5a1b18 Copyright (c) 2007-2013 the FFmpeg developers
  built on Jul  9 2013 18:42:27 with gcc 4.7 (Ubuntu/Linaro 4.7.3-1ubuntu1)
  configuration: --prefix=/home/functor/ffmpeg_build --extra-cflags=-I/home/functor/ffmpeg_build/include --extra-ldflags=-L/home/functor/ffmpeg_build/lib --bindir=/home/functor/bin --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-x11grab
  libavutil      52. 38.100 / 52. 38.100
  libavcodec     55. 18.102 / 55. 18.102
  libavformat    55. 11.101 / 55. 11.101
  libavdevice    55.  2.100 / 55.  2.100
  libavfilter     3. 79.101 /  3. 79.101
  libswscale      2.  3.100 /  2.  3.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  3.100 / 52.  3.100
Input #0, rtsp, from 'rtsp://192.168.0.220:554/stream1/':
  Metadata:
    title           : Test
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: h264 (Baseline), yuv420p, 1280x1024, 90k tbr, 90k tbn, 180k tbc

[Carl Eugen Hoyos]

Thank you!
Could you also test the new version of the patch that allows to specify a custom user-agent? (It should still work if you do not specify anything.)

[imavra]

Works! Both default and not. Thanks!

functor@ichigo:~/bin$ ./ffprobe -user-agent tst rtsp://192.168.0.220:554/stream1/
ffprobe version git-2013-07-09-c5a1b18 Copyright (c) 2007-2013 the FFmpeg developers
  built on Jul 11 2013 12:32:50 with gcc 4.7 (Ubuntu/Linaro 4.7.3-1ubuntu1)
  configuration: --prefix=/home/functor/ffmpeg_build --extra-cflags=-I/home/functor/ffmpeg_build/include --extra-ldflags=-L/home/functor/ffmpeg_build/lib --bindir=/home/functor/bin --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-x11grab
  libavutil      52. 38.100 / 52. 38.100
  libavcodec     55. 18.102 / 55. 18.102
  libavformat    55. 11.101 / 55. 11.101
  libavdevice    55.  2.100 / 55.  2.100
  libavfilter     3. 79.101 /  3. 79.101
  libswscale      2.  3.100 /  2.  3.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  3.100 / 52.  3.100
Input #0, rtsp, from 'rtsp://192.168.0.220:554/stream1/':
  Metadata:
    title           : Test
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: h264 (Baseline), yuv420p, 1280x1024, 90k tbr, 90k tbn, 180k tbc

DESCRIBE rtsp://192.168.0.220:554/stream1/ RTSP/1.0
Accept: application/sdp
User-Agent: tst
CSeq: 2

functor@ichigo:~/bin$ ./ffprobe rtsp://192.168.0.220:554/stream1/
ffprobe version git-2013-07-09-c5a1b18 Copyright (c) 2007-2013 the FFmpeg developers
  built on Jul 11 2013 12:32:50 with gcc 4.7 (Ubuntu/Linaro 4.7.3-1ubuntu1)
  configuration: --prefix=/home/functor/ffmpeg_build --extra-cflags=-I/home/functor/ffmpeg_build/include --extra-ldflags=-L/home/functor/ffmpeg_build/lib --bindir=/home/functor/bin --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-x11grab
  libavutil      52. 38.100 / 52. 38.100
  libavcodec     55. 18.102 / 55. 18.102
  libavformat    55. 11.101 / 55. 11.101
  libavdevice    55.  2.100 / 55.  2.100
  libavfilter     3. 79.101 /  3. 79.101
  libswscale      2.  3.100 /  2.  3.100
  libswresample   0. 17.102 /  0. 17.102
  libpostproc    52.  3.100 / 52.  3.100
Input #0, rtsp, from 'rtsp://192.168.0.220:554/stream1/':
  Metadata:
    title           : Test
  Duration: N/A, start: 0.000000, bitrate: N/A
    Stream #0:0: Video: h264 (Baseline), yuv420p, 1280x1024, 90k tbr, 90k tbn, 180k tbc

DESCRIBE rtsp://192.168.0.220:554/stream1/ RTSP/1.0
Accept: application/sdp
User-Agent: Lavf/55.11.101
CSeq: 2

[Carl Eugen Hoyos]

The second patch was merged, thank you for reporting, analyzing and testing!