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• Streaming video with node

  14 septembre 2016, par Kei Taylor

  I am attempting to stream video with from my built-in Mac OSX webcam to a node server. My intent is to parse the video data I receive with ffmpeg once it reaches the server. This is my first time trying to manipulate video.

  My problem is, right now I am unable to use VLC to send data to a node server. I am opening a stream with VLC by using the "Open Network" option, and streaming through what I think is my local IP, port 3000. However, I am not sure how to get from that to opening the stream on a node file. Also, I am not able to open the stream on the same computer and view it (I mean, when I click open stream on VLC and plug in my local IP and port 3000, I can’t view the stream I’m sending out).

  Clearly, I am doing something wrong. As this is my first experience with VLC and video transmission, its possible I’m missing something important. Its my impression that I should be able to stream to an ip and port using VLC, and then set up a node server that listens for data from this same port and ip, recieves chunks of video data, and formats it using FFMPEG.

  My questions are :

  1) Is this understanding accurate ?
  2) Does anyone have guidance on how I would transmit with VLC and read with FFMPEG in node (and then send to another client ?)
  3) Failing that, any guidance on the simple question of how to transmit a video stream using VLC and then open it using VLC on the same computer ?
  4) Any resources explaining how to do this ?

  I’d really appreciate layman’s, baby explanations. I’ve found a few blog posts that have illuminated issues, but been a bit difficult to follow.

  Thanks, as always.

• Broadcast Screen using ffmpeg to encode H.264

  29 avril 2018, par Erick Weil

  Background History :

  So. doing a program, I need a way to broadcast my desktop screen, trought local network( maybe wi-fi ), to aproximately 40 clients, primarily in windows, but if it also works in linux, will be great.

  Started doing my own video compression protocol, in Java, taking the hilbert curve as a inspiration ( it transmit 10 fps, 1024x720, horrible 8-bit colors, using 5 MB of bandwith) but the color quality was very low, and fps wasn’t that good, cpu usage blowing up to 50%, memory 800M. 

  So i realized i’ll never be able to do a proper encoding algorithm and tried to use ffmpeg to encode the screenshots in a video and transmit this.

  I tried :

  • Xuggler : not supported anymore, examples worked, but it does lack tutorials and things that explain how it works
  • VLCJ : VLC wraper for java, requires the client of the transmission to have VLC installed.
  • JavaCV : java wrapper of openCV, to wrap ffmpeg. my program size blows up if i include this
  • FFMPEG : in c++ i created a project, communication with java trought JNI, the remuxing example worked,
    but i don’t now how to use it to do what I want

  The actual question :

  How can i make a c++ program able to encode image frames into a H264 stream and send it trought UDP ?

  i mean, is there any tutorial on ffmpeg, any place to start learning how to use it.

• Using editly, how do I flip the image horizontally ? [closed]

  13 mai 2023, par placid chat

  Editly is a javascript video commandline editor. How do I get it to flip the source material horizontally ?