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• Streaming low latency video

  26 août 2018, par user4893295

  Goal is to get low latency HD video over the LAN from a USB camera on a ARM device (a10 Lime running Armbian Jessie) to OBS Studio.

  Thinking first step is to at least get it viewable on VLC on another device. So, to that end, I have tried gstreamer (no joy), ffmpeg (same) and VLC. Best luck with VLC so far, but the picture is mostly blank with occasional spots of picture.

  This is the command I’m using :

  cvlc v4l2:///dev/video0:chroma=h264:width=1920:height=1080 --sout '#standard{access=http,mux=ts,dst=0.0.0.0:8080/stream,name=stream,mime=video/ts}' -vvv

  It moans a bit at first with

  [00b4a178] core interface error: no suitable interface module
  
  [00ab18f8] core libvlc error: interface "globalhotkeys,none" initialization failed
  
  [00b4a178] core interface debug: looking for interface module matching "dbus,none": 18 candidates
  
  [00b4a178] dbus interface error: Failed to connect to the D-Bus session daemon: Unable to autolaunch a dbus-daemon without a $DISPLAY for X11
  
  [00b4a178] core interface debug: no interface modules matched
  
  [00b4a178] core interface error: no suitable interface module
  
  [00ab18f8] core libvlc error: interface "dbus,none" initialization failed

  But then seems to get a bit happier

  [b4316038] core demux meta debug: no meta reader modules matched
  
  [b4300508] core input debug: `v4l2:///dev/video0:chroma=h264:width=1920:height=1080' successfully opened
  
  [b4300508] core input debug: Buffering 0%
  
  [b4300508] core input debug: switching to sync mode
  
  [b430cce8] packetizer_h264 decoder debug: found NAL_SPS (sps_id=0)
  
  [b430cce8] packetizer_h264 decoder debug: found NAL_PPS (pps_id=0 sps_id=0)
  
  [b4300508] core input debug: Buffering 10%
  
  [b43041a0] core stream output debug: adding a new sout input (sout_input:0xb49004f0)
  
  [b43060f8] core mux debug: adding a new input
  
  [b43060f8] mux_ts mux debug: adding input codec=h264 pid=68
  
  [b43060f8] mux_ts mux debug: new PCR PID is 68
  
  [b4300508] core input debug: Buffering 32%
  
  [b4300508] core input debug: Buffering 44%
  
  [b4300508] core input debug: Buffering 55%
  
  [b4300508] core input debug: Buffering 65%
  
  [b4300508] core input debug: Buffering 77%
  
  [b4300508] core input debug: Buffering 88%
  
  [b4300508] core input debug: Buffering 98%
  
  [b4300508] core input debug: Stream buffering done (332 ms in 331 ms)
  
  [b4300508] core input debug: Decoder wait done in 0 ms

  And I can connect to it from VLC, but the picture looks like

  

  Processor peaks at around 17% and memory even less than that, so it’s not that.

  Any suggestions ?

• rtsp stream transcode with ffserver/ffmpeg

  30 juin 2018, par Torbjørn

  I’m having a unifi dome webcam. Connected thrue a USG Pro4. I’m sending a rtsp live stream at 1024x576px. Until now I have been using ffserver to transcode the stream into a new mpjpeg stream that I can show in a html file.
  But after I updated ffserver to the newest version. This does not work.

  Using debian.

  ffserver.conf file :

      HTTPPort 8090
  
      # bind to all IPs aliased or not
  
      HTTPBindAddress 0.0.0.0
  
      # max number of simultaneous clients
  
      MaxClients 1000
  
      # max bandwidth per-client (kb/s)
  
      MaxBandwidth 100000
  
      # Suppress that if you want to launch ffserver as a daemon.
  
      # NoDaemon
  
      NoDefaults
      File /tmp/feed1.ffm
  
      FileMaxSize 500M
      Feed feed1.ffm
  
      Format mpjpeg
  
      VideoCodec mjpeg
  
      VideoFrameRate 1
  
      #VideoBufferSize 80000
  
      VideoQMin 1
  
      VideoQMax 5
  
      VideoSize 1024x576
  
      PreRoll 0
  
      Noaudio
  

  ffmpeg startup :

  `ffmpeg -rtsp_transport tcp -re -i "rtsp ://user:pass@193.213.XXX.XXX:554/s2" -b:v 1016k http://localhost:8090/feed1.ffm`

  I’ve tried with different startups after some google search. But I can get 1-10 fps before it shuts down.
  Sometimes I get :

  `rtsp ://user:pass@193.213.XXX.XXX:554/s2 : Invalid data found when processing input`

      Input #0, rtsp, from ’rtsp ://user:pass@193.213.XXX.XXX:554/s2’ :
  
        Metadata :
  
          title : s2
  
        Duration : N/A, start : 0.000000, bitrate : N/A
  
          Stream #0:0 : Audio : aac (LC), 11025 Hz, mono, fltp
  
          Stream #0:1 : Video : h264 (Main), yuvj420p(pc, bt709, progressive), 1024x576 [SAR 189:190 DAR 168:95], 1 fps, 1 tbr, 90k tbn, 2 tbc
  
      Output #0, ffm, to ’http://localhost:8090/feed1.ffm’ :
  
        Metadata :
  
          title : s2
  
          creation_time : now
  
          encoder : Lavf57.56.101
  
          Stream #0:0 : Video : mjpeg, yuvj420p(pc), 1024x576 [SAR 189:190 DAR 168:95], q=1-5, 1016 kb/s, 1 fps, 1000k tbn, 1 tbc
  
          Metadata :
  
            encoder : Lavc57.64.101 mjpeg
  
          Side data :
  
            cpb : bitrate max/min/avg : 0/0/1016000 buffer size : 0 vbv_delay : -1
  
      Stream mapping :
  
        Stream #0:1 -> #0:0 (h264 (native) -> mjpeg (native))
  
      Press [q] to stop, [?] for help
  
      frame=    4 fps=0.7 q=2.1 Lsize=     564kB time=00:00:03.00 bitrate=1540.1kbits/s dup=1 drop=0 speed=0.54x
  
      video:558kB audio:0kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead : 1.089245%
  

  Is there an easy way to get this working, or is there a much better way of doing it ?
  What i want out of this is an live web cam stream in an html site that works on all platforms without any plugins on clients end.

• Run ffmpeg as window service

  7 juin 2018, par Brad Reiter

  My setup is like this :

  It contains components :

  • Web Cam : which send out the RTP packets when i get a stream request
  • Agent server : Which receives the stream from the Webcam and forwards
    the same to ffmpeg server.
  • ffmpeg server : this where i need to run the ffmpeg as window service,
    receives the rtp stream sent by agent server and create a ts file.

  What have i done is :

  I have setup the ffmpeg in one of my dev environment using this link :

  https://video.stackexchange.com/questions/20495/how-do-i-set-up-and-use-ffmpeg-in-windows

  My problems :

  • How to make ffmpeg run as daemon.?
  • How can i make ffmpeg aware that new stream is coming from agent
    server and start creating a ts file.?
  • Is there a way in ffmpeg that i reserve ports for ffmpeg and make it
    listen to all the ports for eg : reserve 2000 - 3000 ports and listen
    to them as soon as rtp stream arrives, convert to ts stream.

  Regards