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• Ubuntu ffmpeg command -i not found

  12 avril 2016, par Gerwin

  I’m a beginner with Ubuntu and I need to setup a streaming server for my company, I’ve installed NGINX and FFMPEG, but when I call ffmpeg -i in the ~/ffmpeg/ffmpeg directory it returns an error command not found but when I call ./ffmpeg -i it returns a list with configurations.. why does ffmpeg -i not work and how can I fix it ?

  I think that the Path Enviroment Variable is incorrect but how would I go abouts changing said variable ? I’m not that experienced with Ubuntu / CMD programming / FFMPEG configuration.

  Sources - https://trac.ffmpeg.org/wiki/CompilationGuide/Ubuntu
  https://github.com/arut/nginx-rtmp-module/wiki/Control-module
  and http://docs.unified-streaming.com/tutorials/live/broadcast-247.html#continuous-timestamps

• How to use yadif filter in ffmpeg ?

  2 juin 2015, par Pavel

  I write application on C++ with ffmpeg. I read interlaced frames with opencv VideoCapture and convert it to AVFrame for use yadif filter.
  Can you give me simple example with yadif filter using ? filtering_video.c from ffmpeg docs is too broad

• WebRTC Multi-Stream recording

  11 janvier 2021, par Tim Specht

  I'm currently trying to build a WebRTC streaming architecture that contains multiple users streaming content from their camera in the same "room" and a SFU / MCU on server-side "recording" the incoming video packets, merging them into one image and re-distributing them to the viewers as either RTMP or HLS for added scalability.

  


  Upon doing some initial research on this, Janus Gateway seems like a good fit for this given it's wide adoption across the space + their (seemingly) extensible plugin architecture. Thus, I'm currently trying to figure out what a recommended architecture for my use-case would look like.
I looked at the following plugins :

  


  

  • Janus Streaming

  


  • Janus Recordings

  


  


  While Janus and the Streaming plugin seem like a good start to get the broadcasting aspect within the group of casters in the room, I'm trying to piece together how I could combine the different video sources into a combined one (split horizontally for example if there are 2 casters active) and retransmit the final result as something optimized for broadcast-consumption like HLS. Some of the ways I could imagine doing that :

  


  

  • Implement a custom Janus plugin that transcodes the incoming buffers on the gateway itself

  


  • Forwarding the incoming packets via RTP to a Transcoding server

    

    • In this specific case I am not sure what would be best to implement that ? Are the video frames different tracks ? Could I stream all of them to the same port and have ffmpeg or something similar take care of the merging for me ?