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• Controlling "Real-Time" sending rate in RTP Streaming with FFMpeg

  14 décembre 2020, par Robert_Ordis

  I'm trying to build an experimental audio telephony system with ffmpeg to talk some G.711 VoIP machine.

  


  Then, I tried this command.

  


  .\ffmpeg.exe -re -f dshow -i audio="CABLE Output (VB-Audio Virtual Cable)" -ac 1 -ab 64k -ar 8000 -f mulaw -f rtp "rtp://192.168.3.175:4449?fifo_size=240&localrtpport=5100&pkt_size=240"


  


  In WireShark capturing, the audio in each packets was actually divided in each around 30[ms].

  


  However, 17- 18 packets was sent together once per 500[ms].

  


  Sent audio was correct, but in this situation, an opponent machine can't treat this correctly.

  


  How do I send these packets in per "UNDER 0.5 SEC" ?

  


• Possible to stream video over 115kbps ?

  15 mai 2014, par Arcadio Alivio Sincero

  I need some advice from people experienced with streaming video.

  I have a task to put together a system that allows video coming from RS-170 (composite) video cameras and have them displayed on an iPad. The catch is that no wireless (no Wi-Fi, no bluetooth) is allowed. Only a wired interface.

  The physical I/O options on an iPad are apparently extremely limited, but I did manage to come across a company named Redpark that makes an RS232-to-Lightning cable. So my proposed solution is to have the video feeds go into a box with software that digitizes and encodes the video, and then sends it over RS232 to the iPad using that cable. The catch here is that the maximum bandwidth on that cable is 115kbps.

  My preliminary testing of this setup on a prototype system have been less than stellar so far. I set up two PCs, each with serial ports, and hooked them together with a null modem. I then set the baud rates of the ports to 115kpbs and then attempted to stream a web cam video feed over the serial connection in real-time using ffmpeg. The results weren’t very encouraging, but I at least did manage to get some sort of image to show up.

  I guess I need to play around with the ffmpeg encoding options some more. But I need to ask : am I wasting my time with this idea, or should what I am asking here be possible ?

• AWS Lambda making video thumbnails

  9 décembre 2017, par Jesus

  I want make thumbnails from videos uploaded to S3, I know how to make it with Node.js and ffmpeg.

  According to this forum post I can add libraries :

  ImageMagick is the only external library that is currently provided by
  default, but you can include any additional dependencies in the zip
  file you provide when you create a Lambda function. Note that if this
  is a native library or executable, you will need to ensure that it
  runs on Amazon Linux.

  But how can I put static ffmpeg binary on aws lambda ?

  And how can I call from Node.js this static binary (ffmpeg) with AWS Lambda ?

  I’m newbie with amazon AWS and Linux

  Can anyone help me ?