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• Re-stream (forward) UDP-Live-Video-Stream (using winsock) reduce video quality ?

  18 août 2014, par vantrung -cuncon

  So, I used ffmpeg to stream the live webcam using UDP protocol to port 1111 :

  ffmpeg -f dshow -i video="Lenovo EasyCamera" -f mpegts udp://localhost:1111

  When I played it directly by ffplay from port 1111, everything worked properly :

  ffplay udp://localhost:1111

  I got the video quality like this :

  

  So I think, I could write some winsock-codes to listen to port 1111 & forward any UDP packet that it catches to port 2222. Thus, I could simulate that I’m streaming to port 2222. My code is something like this :

  ' // Please note that this is the simplified code - cause it worked
  
  ' // i've just post the key lines
  
  Winsock1.Bind 1111
  
  Winsock2.remotePort = 2222
  
  
  
  WinSock1.GetData myPacket
  
  Winsock2.SendData myPacket

  Then I tried playing the stream from port 2222 using ffplay :

  ffplay udp://localhost:2222

  Well, I don’t know why the video quality turned to this bad :

  

  The point is that, I’ve sent the same UDP packets in the same order as the streaming-source. What could be wrong here ?

  ---

  PS : I’ve tried a similar experiment like above with TCP, but the end-result video quality was as good as direct streaming. So, could this be a problem of UDP ?

  ---

  PS2 : I’ve tested the UDP packet loss & disorder by replacing the ffplay with a socket that listen to port 2222 & print out all the received packets. But the result is all 10,000+ packets were in correct order & nothing lost. What a crazy phenomenon ?

• using ffmpeg implementation live video/audio

  14 mars 2018, par geeeek

  I am going to implementation live video/audio service using ffmpeg.

  I am using embedded board with camera, mic. Receiver is android phone.

  as summary :
  sender : embedded board.
  receiver : android phone.

  I have an embedded board with a camera and a microphone. The camera’s data is raw h264 data, and the audio data is raw pcm data. I want to do live video communication with Android phone, but I do not know how.

  I would like to mux two data with ffmpeg and send it, but I do not know if it is possible. Thank you for your advice.

  I can not be sure because I have no experience about ffmpeg in live.

  About above enviroment please suggest your best methods.

• dvb-t live mpeg2-ts to apache with hls

  27 février 2018, par Elmer

  I have a dvb-s which capture channels from sat, and streams it in unicast/multicast through mumudvb.
  I would to encoding a channels, in hls format, it’s possible with on ubuntu server with apache2 or ngix ?

  Thanks so much.