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• rtsp stream capturing

  12 avril 2016, par ДМИТРИЙ МАЛИКОВ

  I’m looking for some universal way to dump rtsp stream. I want to figure out, that some rtsp stream is working well and server is sending some watchable video.

  openRTSP

  At first, google recommends me openRTSP tool.

   openRTSP -4 ${stream_link} > ${output_file}

  But output video file dumped by that tool is not really correct. Video decoder (ffdec) returns many errors like "Failed to decode video packet" and "[h264] no frame !", which don’t suit me.

  ffmpeg

  Then I’ve tried to dump rtsp stream with ffmpeg tool.

  ffmpeg -loglevel debug -i "${stream_link}" -s 640x480 -vcodec copy -acodec copy -y ${output_file}

  But streaming process was interrupted often by error :

  Application provided invalid, non monotonically increasing dts to muxer in stream 0: 730672 >= 730672
  
  av_interleaved_write_frame(): Invalid argument

  I’m trying to use --fflags igndts but ffmpeg doesn’t ignore these errors. It doesn’t make any sense, because that error actually means that audio and video streams are sending asynchronously. The worst thing is that dumped file, resulted by that interrupted dump, is not correct too. Ffdec return some error :

  ERROR [mov,mp4,m4a,3gp,3g2,mj2] moov atom not found
  
  ERROR [ffdec] av_open_input_file: Operation not permitted

  After a nice cup of googling I’ve found, that it’s really old ffmpeg’s muxer bug.

  mplayer

  Than I’ve tried to use mplayer with LIVE_555 lib.

  mplayer -noframedrop -dumpfile ${output_file} -dumpstream ${stream_link}

  But I’ve got some errors too.

  Stream not seekable!
  
  Core dumped ;)

  Question

  I think I’m doing something wrong. It’s sounds really ridiculous, that there is no way to save rtsp stream in correct and playable video-file.

  Maybe there are some another tools which can help with that task ? Actually, I will be grateful for any advice for all kind of libs and languages. But that process should be automatic and have cli.

  Refinements

  Something about 50% experiments I’ve done on the localhost with vlc-streamer that emulates rtsp-broadcaster. Here is a manual which I try to follow.

  I have really fresh and latest ffmpeg with x264 support, that I’ve installed by that useful thread.

• bigbluebutton ...

  7 mars 2015, par signo

  ---

  Hello i have a BigBlueButton (0.9.0-beta (622)) installation on Debian Wheezy (7.8) all is ok except archiving recordings...

  in the log (/var/log/bigbluebutton/archive-488052dc7c095c74bf8992ec51a66298db04b765-1425642166675.log) i have always same message :

  I, [2015-03-06T11:48:19.320704 #4550]  INFO -- : Archiving events for 488052dc7c095c74bf8992ec51a66298db04b765-1425642166675.
  
  W, [2015-03-06T11:48:19.851280 #4550]  WARN -- : Failed to archive events for 488052dc7c095c74bf8992ec51a66298db04b765-1425642166675. Permission denied - /var/bigbluebutton/recording/raw/488052dc7c095c74bf8992ec51a66298db04b765-1425642166675/events.xml (complete error below...)

  but all directory are writable by right user (tomcat7).

  More Info :

  bbb packages installed

  ii  bbb-apps                              0.9.0-1ubuntu88               amd64        BigBlueButton applications for Red5
  
  ii  bbb-apps-deskshare                    0.9.0-1ubuntu25               amd64        BigBlueButton deskshare module for Red5
  
  ii  bbb-apps-sip                          0.9.0-1ubuntu19               amd64        BigBlueButton SIP module for Red5
  
  ii  bbb-apps-video                        0.9.0-1ubuntu18               amd64        BigBlueButton video module for Red5
  
  ii  bbb-client                            0.9.0-1ubuntu235              all          BigBlueButton Flash client
  
  ii  bbb-config                            0.9.0-1ubuntu42               all          BigBlueButton configuration
  
  rc  bbb-demo                              0.9.0-1ubuntu8                amd64        BigBlueButton API demos
  
  ii  bbb-freeswitch                        0.9.0-1ubuntu38               amd64        BigBlueButton build of FreeSWITCH 1.5.x
  
  ii  bbb-mkclean                           0.8.7-1                       amd64        tool to clean and optimize Matroska and WebM files
  
  ii  bbb-office                            0.9.0-1ubuntu6                amd64        BigBlueButton wrapper for LibreOffice
  
  ii  bbb-playback-presentation             0.9.0-1ubuntu11               amd64        BigBluebutton playback of presentation
  
  ii  bbb-record-core                       0.9.0-1ubuntu37               amd64        BigBlueButton record and playback
  
  ii  bbb-red5                              0.9.0-1ubuntu25               amd64        The Red5 server for bbb
  
  ii  bbb-swftools                          0.9.2-1ubuntu14               amd64        The swftools files for bbb
  
  ii  bbb-web                               0.9.0-1ubuntu54               all          BigBlueButton API
  
  ii  bigbluebutton                         0.9.0-1ubuntu2                amd64        Open source web conferencing platform (bbb)

  ---

  bbb-conf —check

  BigBlueButton Server 0.9.0-beta (622)
  
                      Kernel version: 3.16.0-4-amd64(64-bit)
  
                              Memory: 12044 MB
  
  
  
  /var/www/bigbluebutton/client/conf/config.xml (bbb-client)
  
          Port test (tunnel): 2xx.xxx.xxx.xx
  
                                Red5: 2xx.xxx.xxx.xx
  
                useWebrtcIfAvailable: true
  
  
  
  /opt/freeswitch/conf/sip_profiles/external.xml (FreeSWITCH)
  
                      websocket port: 5066
  
                      WebRTC enabled: true
  
  
  
  /etc/nginx/sites-available/bigbluebutton (nginx)
  
                         server name: 2xx.xxx.xxx.xx
  
                                port: 80
  
                      bbb-client dir: /var/www/bigbluebutton
  
  
  
  /var/lib/tomcat7/webapps/bigbluebutton/WEB-INF/classes/bigbluebutton.properties (bbb-web)
  
                        bbb-web host: 2xx.xxx.xxx.xx
  
  
  
  /usr/share/red5/webapps/bigbluebutton/WEB-INF/red5-web.xml (red5)
  
                    voice conference: FreeSWITCH
  
                       capture video: true
  
                     capture desktop: true
  
  
  
  /usr/local/bigbluebutton/core/scripts/bigbluebutton.yml (record and playback)
  
                       playback host: 2xx.xxx.xxx.xx
  
  
  
  
  
  * Potential problems described below **
  
      # IP does not match:
  
      #                           IP from ifconfig: 172.xx.xxx.xx
  
      #   /etc/nginx/sites-available/bigbluebutton: 2xx.xxx.xxx.xx
  
      # Error: Unable to connect to port 1935 (RTMP) 2xx.xxx.xxx.xx
  
  
  
      # Error: Unable to connect to port 9123 (desktop sharing) on 212.xxx.xxx.xx

  ---

  ls -l /var/freeswitch/meetings/

  -rw-r--r-- 1 freeswitch daemon 5139984 Mar  6 11:44 488052dc7c095c74bf8992ec51a66298db04b765-1425642166675-81976383.wav

  ---

  ls -l /usr/share/red5/webapps/video/streams/488052dc7c095c74bf8992ec51a66298db04b765-1425642166675/

  -rw-rw-r-- 1 red5 red5 438342 Mar  6 11:44 320x240-cztd6nyzasaz_1-1425642114164.flv

  ---

  ls -l /usr/share/red5/webapps/video/streams/488052dc7c095c74bf8992ec51a66298db04b765-1425642166675/

  -rw-rw-r-- 1 red5 red5 438342 Mar  6 11:44 320x240-cztd6nyzasaz_1-1425642114164.flv

  ---

  cat /usr/share/red5/webapps/video/WEB-INF/red5-web.xml

  <bean class="org.bigbluebutton.app.video.VideoApplication">
  
          <property value="true"></property>
  
          <property ref="redisRecorder"></property>
  
  </bean>

  ---

  cat /usr/share/red5/webapps/deskshare/WEB-INF/red5-web.xml

   <bean class="org.bigbluebutton.deskshare.server.stream.StreamManager">
  
      
  
      
  
   </bean>

  ---

  bbb-record —watch

  Every 2.0s: bbb-record --list20                                                                                                                                   Fri Mar  6 11:53:58 2015
  
  
  
  Internal MeetingID                                               Time                APVD APVDE RAS Slides Processed            Published           External MeetingID
  
  ------------------------------------------------------  ---------------------------- ---- ----- --- ------ -------------------- ------------------  -------------------
  
  57d9849193299cebe9409d1c98d175958331d34a-1425642748807  Fri 6 Mar 11:52:28 GMT 2015   X                  5
  
  488052dc7c095c74bf8992ec51a66298db04b765-1425642166675  Fri 6 Mar 11:42:46 GMT 2015  XXX         X       6

  ---

  bbb-record —debug

  E, [2015-03-06T11:48:20.335578 #4548] ERROR -- : Sanity check failed on 488052dc7c095c74bf8992ec51a66298db04b765-1425642166675

  ---

  cat /var/log/bigbluebutton/archive-488052dc7c095c74bf8992ec51a66298db04b765-1425642166675.log

  # Logfile created on 2015-03-06 11:48:19 +0000 by logger.rb/31641
  
  I, [2015-03-06T11:48:19.320704 #4550]  INFO -- : Archiving events for 488052dc7c095c74bf8992ec51a66298db04b765-1425642166675.
  
  W, [2015-03-06T11:48:19.851280 #4550]  WARN -- : Failed to archive events for 488052dc7c095c74bf8992ec51a66298db04b765-1425642166675. Permission denied - /var/bigbluebutton/recording/raw/488052dc7c095c74bf8992ec51a66298db04b765-1425642166675/events.xml
  
  I, [2015-03-06T11:48:19.851428 #4550]  INFO -- : Fetching the recording marks for 488052dc7c095c74bf8992ec51a66298db04b765-1425642166675.
  
  I, [2015-03-06T11:48:19.851501 #4550]  INFO -- : Getting record status events
  
  W, [2015-03-06T11:48:19.851585 #4550]  WARN -- : Failed to fetch the recording marks for 488052dc7c095c74bf8992ec51a66298db04b765-1425642166675. Permission denied - /var/bigbluebutton/recording/raw/488052dc7c095c74bf8992ec51a66298db04b765-1425642166675/events.xml
  
  I, [2015-03-06T11:48:19.851645 #4550]  INFO -- : Archiving audio /var/freeswitch/meetings/488052dc7c095c74bf8992ec51a66298db04b765-1425642166675*.wav.
  
  W, [2015-03-06T11:48:19.851920 #4550]  WARN -- : Failed to archive audio for 488052dc7c095c74bf8992ec51a66298db04b765-1425642166675. Permission denied - /var/bigbluebutton/recording/raw/488052dc7c095c74bf8992ec51a66298db04b765-1425642166675/audio
  
  I, [2015-03-06T11:48:19.851981 #4550]  INFO -- : Archiving presentation for 488052dc7c095c74bf8992ec51a66298db04b765-1425642166675.
  
  W, [2015-03-06T11:48:19.852257 #4550]  WARN -- : Failed to archive presentations for 488052dc7c095c74bf8992ec51a66298db04b765-1425642166675. Permission denied - /var/bigbluebutton/recording/raw/488052dc7c095c74bf8992ec51a66298db04b765-1425642166675/presentation
  
  I, [2015-03-06T11:48:19.852322 #4550]  INFO -- : Archiving deskshare for 488052dc7c095c74bf8992ec51a66298db04b765-1425642166675.
  
  W, [2015-03-06T11:48:19.852561 #4550]  WARN -- : Failed to archive deskshare for 488052dc7c095c74bf8992ec51a66298db04b765-1425642166675. Permission denied - /var/bigbluebutton/recording/raw/488052dc7c095c74bf8992ec51a66298db04b765-1425642166675/deskshare
  
  I, [2015-03-06T11:48:19.852620 #4550]  INFO -- : Archiving video for 488052dc7c095c74bf8992ec51a66298db04b765-1425642166675.
  
  W, [2015-03-06T11:48:19.852834 #4550]  WARN -- : Failed to archive video for 488052dc7c095c74bf8992ec51a66298db04b765-1425642166675. Permission denied - /var/bigbluebutton/recording/raw/488052dc7c095c74bf8992ec51a66298db04b765-1425642166675/video

  ---

  all folder under /var/bigbluebutton/ have same rights (drwxrwxrwx tomcat7 tomcat7)

  ls -l /var/bigbluebutton/

  total 40
  
  drwxr-xr-x 3 tomcat7 tomcat7 4096 Mar  6 11:42 488052dc7c095c74bf8992ec51a66298db04b765-1425642166675
  
  drwxr-xr-x 3 tomcat7 tomcat7 4096 Mar  6 11:52 57d9849193299cebe9409d1c98d175958331d34a-1425642748807
  
  drwxrwxrwx 2 tomcat7 tomcat7 4096 Mar  3 15:52 blank
  
  drwxrwxrwx 2 tomcat7 tomcat7 4096 Feb 17 17:17 configs
  
  drwxrwxrwx 2 tomcat7 tomcat7 4096 Mar  3 15:57 deskshare
  
  drwxrwxrwx 2 tomcat7 tomcat7 4096 Mar  3 15:57 meetings
  
  drwxrwxrwx 3 tomcat7 tomcat7 4096 Mar  3 15:52 playback
  
  drwxrwxrwx 3 tomcat7 tomcat7 4096 Mar  3 15:57 published
  
  drwxrwxrwx 6 tomcat7 tomcat7 4096 Mar  3 15:57 recording
  
  drwxrwxrwx 2 tomcat7 tomcat7 4096 Mar  3 15:57 unpublished

  ---

• Music Video Idiosyncrasies

  18 juin 2011, par Multimedia Mike — General

  So I’m watching a fairly recent music video for a song named "XXXO" from an artist named M.I.A. when I’m suddenly assaulted by this imagery :

  
  
  

  ... and I enter nervous convulsions. You see, while this might seem to be an odd video effect to the casual viewer, to a multimedia hacker, it appears to be deliberately antagonistic. To anyone who has written a video codec, this scene looks like an entire casserole of video bugs, combining creeping plane offsets errors, chroma problems, and interlacing havoc. The craziest part is to realize that this is probably some kind of standard video effect / filter type. Upon a repeat viewing, I realized that the entire video sort of looks like an amateur video editor’s first week using video software.

  Elsewhere in the video, a YouTube-style video frame vortex highlights the proceedings. I guess I need to come to terms with the fact that the ubiquitous player frame is just part of the digital Zeitgeist now :

  
  
  

  Vintage Video Strangeness
  I’m a long-time music video junkie but I have a tendency of examining them entirely too closely. I first saw Paula Abdul’s video for "Cold-Hearted" when I was just starting to understand multimedia technology and how it interacted with emerging home computers. Imagine how confused I was when I tried to make sense of the actions performed by our eMaestro "Chuck" whom Paula has instructed to "hit it". First, he hits a key followed by 3 quick strikes on a second key :

  
  
  

  Then, the "start music" action is apparently bound to a particular key on the electronic keyboard :
  
  

  
  
  

  Which kicks off the electronic metronome on the computer. Each identical-sounding beat quizzically maps to a different frequency transform :

  
  
  a one...
  
  and a two...
  
  and a three...
  

  I had no trouble believing things up to this point. But even though I didn’t understand what was going on with that frequency transform, I knew that it must have had something to do with the audio. And if the audio was the same, the visualization ought to be the same. Though, to be fair, I will concede that the first and third ticks pictured bear some mutual resemblance.

  Anyway, the software is probably real even if the keyboard interaction was stylized. Can anyone identify the software ? What about the computer ? This is perhaps the best view the video gives us :

  
  
  

  So, remember, don’t base your understanding of technology — or anything, really — on stylized media representations. Don’t even get me started on the movie "Sneakers." That had me confused about cryptography and computer security for many years.