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• 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.

• Capture pictures from IP camera

  29 décembre 2016, par Иван Деркач

  i’m trying to make project, which will take picture from ip camera (camera can’t send any esle format of video, except for .h264), my problem in that i don’t know, how to do it. I used live555 library and i tried to use openRTSP (from testProgs). So got images this way, but i had make .mp4 files and save little slices of video, after i opened them with Aforge.Video.FFMPEG library and took pictures, but i couldn’t take the video, while my parallel thread made me those files. So i checked those files in my program, but it doesn’t work. There was another problem, live555 standart program don’t write evenly(first file can be 10 sec, second can be 8 seconds, about 5-6 files don’t work, if total duration 20 secodns), and because of it Aforge couldn’t open them all. Please help me, i suggest that i should use testRTSPclient(from testProgs too), it’s dummy of real program, but i don’t know, what to do, this library little hard for my understanding. Give me advice and thanks.
  There references to this library : http://www.live555.com/
  There visual studio project of this library : http://www.bumblebee.website/downloads_l555.html

• FFMPEG и bitrate

  26 avril 2012, par victor kulichkin

  I wrote the app for broadcasting video streams to livestream.com. For it I used FFMPEG codes.
  The program works well, but there is one issue : if I set an height bitrate (300 - 500 kbit/s),
  then I get a good video, but the server (livestream.com) shows video with interrupts. If I set a low bitrate (50 - 100 kbit/s) - the video goes without interrupts, but its quality is not good. I tried to find some avarage value of bitrate (100 - 150), where the video stream went without interrupts, but my customer did not like its quality.

  I downloaded XSplit software, which had the same broadcast feature, and saw that program sent a good video stream with a low bitrate (50 - 150 kBit/s).
  Anybody says me how is this possible to make it ?