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• How can I store a live stream when internet connection is interrupted ?

  5 juin 2019, par Marcello Moreira

  I’m building a solution using drone and 3g/4g connection.
  I have an IP camera encoded in H.264 by a hardware encoder connected to a raspberry pi and a 3g/4g moldem. The hardware encoder livestream de video via RTMP to a remote server I have. All these devices are in a moving platform, and sometimes the moldem loses connection with internet for a few seconds/minutes. When this happens, I want to store the live footage in the raspberry with ffmpeg, and when the connection restores I can send it back to the server. I have access to the encoded livestream from the raspberry pi over LAN even when internet is down.

  I do not know how and where should I start.
  I see two approaches for this.

  First approach

  One is to do all the streaming via ffmpeg, and disable the automatic hardware stream, when ffmpeg detects that it can’t send stream to the remote server, it starts to store the video (like a buffer) until the connection is restore. The issue with this, is that I don’t know if ffmpeg can detect if internet connection is down, and how can I buffer the video. Also by doing this, when connection is restored, live video would have a huge delay, and I can’t have lot’s of delay in my solution.

  Second approach

  The second is simultaneously store with ffmpeg the live video, when internet goes down, a process records the timestamp, and keeps watching until internet connection is restored. Then it sends to my server only the missing piece. At my server I would need to figure out a way to join those streams back up.. (I would gladly accept tips on that too). Issue with this is that there’s limited space in my raspberry, so I can only store a limited amount. Also, my device may be turned off when it lands so I need to send the video recording ASAP after connection is restored.

  So, which approach seems to be the better one ?

• ffmpeg with Axis P1347 returns 400 Bad Request, but Axis 1357 works

  3 mai 2016, par steampowered

  I have two cameras : an Axis P1347 and an Axis P1357. ffmpeg gets a 400 Bad Request on the P1347 but everything works fine with the P1357.

  I am able to successfully stream rtsp video using vlc from an Axis P1347 Camera using the following url :

  rtsp://10.8.3.85:554/axis-media/media.amp?videocodec=h264&audio=1 

  However, this same url in ffmpeg gives the following for the Axis P1347 Camera :

  root@ubuntu4-virtual-machine:/home/ubuntu4# ffmpeg -re -v verbose  -i "rtsp://10.8.3.85:554/axis-media/media.amp?videocodec=h264&audio=1"
  
  ffmpeg version git-2016-05-02-9fcb59c Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.1)
  
    configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-version3
  
    libavutil      55. 23.100 / 55. 23.100
  
    libavcodec     57. 38.100 / 57. 38.100
  
    libavformat    57. 35.100 / 57. 35.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 44.100 /  6. 44.100
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  rtsp://10.8.3.85:554/axis-media/media.amp?videocodec=h264&audio=1: Server returned 400 Bad Request

  The same ffmpeg command works great with the nearly identical Axis P1357 Camera :

  root@ubuntu4-virtual-machine:/home/ubuntu4# ffmpeg -re -rtsp_transport tcp -i "rtsp://10.8.3.90:554/axis-media/media.amp?videocodec=h264&audio=1"
  
  ffmpeg version git-2016-05-02-9fcb59c Copyright (c) 2000-2016 the FFmpeg developers
  
    built with gcc 4.8 (Ubuntu 4.8.4-2ubuntu1~14.04.1)
  
    configuration: --enable-gpl --enable-libfaac --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-librtmp --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-version3
  
    libavutil      55. 23.100 / 55. 23.100
  
    libavcodec     57. 38.100 / 57. 38.100
  
    libavformat    57. 35.100 / 57. 35.100
  
    libavdevice    57.  0.101 / 57.  0.101
  
    libavfilter     6. 44.100 /  6. 44.100
  
    libswscale      4.  1.100 /  4.  1.100
  
    libswresample   2.  0.101 /  2.  0.101
  
    libpostproc    54.  0.100 / 54.  0.100
  
  Input #0, rtsp, from 'rtsp://10.8.3.90:554/axis-media/media.amp?videocodec=h264&audio=1':
  
    Metadata:
  
      title           : Media Presentation
  
    Duration: N/A, start: 0.083300, bitrate: N/A
  
      Stream #0:0: Video: h264 (Main), yuvj420p(pc, bt709), 2592x1944 [SAR 1:1 DAR 4:3], 12 tbr, 90k tbn
  
      Stream #0:1: Audio: aac (LC), 16000 Hz, mono, fltp

  Obviously rtsp is turned on and working if vlc can display video, correct ? So why does VLC work with the camera, but not ffmpeg ? Note ffmpeg is installed and works correctly with a similar camera.

• #include file from library returns "file not found"

  16 juin 2015, par Yossi Tsafar

  I’m getting this error from multiple .a files

  'libavcodec/avcodec.h' file not found

  Even though I added the library to project and also to "Library Search Paths" :

  $(PROJECT_DIR)/Project/Custom/RTPlayer/3rd-party/ffmpeg/lib

  This is how I add it to project :

  #include "libavcodec/avcodec.h"

  Please someone help me what seems to be the problem ?

  Thanks in advance !