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• Experiences on building a video recorder for RTSP/RTP streams ?

  3 août 2016, par molokoV

  I have to store continuous video streams from many ip cameras,
  The video is encoded in H.264 and the audio is in AAC or MP3.
  The recorded videos will be played mostly on mobile devices but also on browsers.

  • What would be the best strategy to build a scalable recorder service ?

  • What is the best storage format ? mp4 ?

  • Should i convert the video directly to MP4 ? or is better to store RAW RTP ?

  • Whats the best way to ensure best reliability and less frame loses and avoid lost of sync between audio and video ?

  • I also want to hear similar experiences

  Thanks !

• H.264 - Green frames when streaming over TCP using FFmpeg

  29 août 2017, par Naseeb Panghal

  I am using FC23 machine and FFMPEG version is 2.8.10

  Using below command, I can stream flv over tcp successfully and able to receive it successfully at receiver side as well. I play it using vlc player. Both audio and video are played well.

  ./ffmpeg -f x11grab -s 1920x1080 -framerate 15 -i :0.0 -f alsa -ac 2 -i hw:1 -vcodec libx264 -r 30 -pix_fmt yuv420p -tune zerolatency -preset ultrafast -acodec aac -strict -2 -ar 48000 -ab 96k -f flv -metadata streamName=naseeb.sdp tcp ://127.0.0.1:6666

  But in actually i need to do this using an application. So i wrote an application in ’C’ language.
  I have done following things in the application.

   1. Open `AVOutputFormat` using below API
  
      fmt = av_guess_format("flv", NULL , NULL);
  
   2. Get `AVFormatContext` using below API
  
      avformat_alloc_output_context2(&oc, fmt, NULL, NULL);
  
   3. Then added streams(audio and video) using required APIs
  
   4. Then open codecs using required APIs
  
   5. Then set the output using below API
  
      ret = avio_open(&oc->pb, filename, AVIO_FLAG_WRITE);

  (A) If I need to write flv into a file on system then I provide filename in step 5 as muxer.flv.
  

  • result : When I play muxer.flv using VLC player both video and audio are played well
    

  (B) If I need to stream flv over tcp then I provide filename as tcp://127.0.0.1:6666.
  

  • result : When it is streamed over network then Green frames are shown for video (yet audio works very well). Is there an extra setting required when I need to stream it over network ?

  I have no doubt on Receiver side as it works very well with FFmpeg utility (command mentioned above).
  Currently I have downloaded ffmpeg 2.8.10 source code and looking into ffmpeg.c file for some extra setting. Till now I have not found anything helpful.

  Please suggest something why Green frames shown when flv is sent on network where it works well when dump on system hard disk.

• How to secure HLS video file for offline playback in react native

  21 août 2019, par Rakish Frisky

  Hey currently I want to try to make an application to store our video and download it. I already encrypt the HSL Video file but to support full offline playback I would have to give the key along with the HLS video file. So how to make my HLS video only can be played in my apps ?

  can someone help me to solve this problem ? I already stuck for this problem in 2 weeks