Recherche avancée

Sur d’autres sites (6475)

• send point to point video stream using ffmpeg with rtsp (c++)

  8 décembre 2015, par seleciii44

  I need to send a h264 encoded video stream to a(only one) specific IP address with RTSP protocol on a windows PC with C++. I’m trying to use the FFMPEG library.

  I used the example in this post and i can play the stream as :

  ffplay -rtsp_flags listen -i rtsp://127.0.0.1:8554/live.sdp

  The problem is, according to the solution of post i need a server. Where -rtsp_flags listen option of ffplay behaves like a server.

  On the other hand, according to StreamingGuide of ffmpeg i can send a point to point stream like :

  ffmpeg -i INPUT -acodec libmp3lame -ar 11025 --f rtp rtp://host:port

  This is fine and works well. But i need to use rtsp. According to StreamingGuide again,

  Another option is to use RTP (which by default uses UDP) but by
  specifying it use TCP :

  ffmpeg -i input -f rtsp -rtsp_transport tcp rtsp://localhost:8888/live.sdp

  which seems to be what i’m looking for. Yet the ffmpeg tool seems to be doing nothing when i try this method (don’t know why i need tcp,but udp does not work neither). Why is that ?

  FFMPEG protocols documentation, says that i need to use a media server to send the video.

  • Why would i need a media server to just send the video stream to another PC or whatever ?
  • If i need a media server, how does the IP Camera sends the stream ?
  • If i have no option but to use a media server, could some one please recommend a server for Windows 7 ?
    • ffserver is only for linux
    • live555mediaServer seems to be used for local files or am i wrong ?
    • ..?

  Best regards,
  Gokhan.

• How can I write SAPI audio stream to stdout in VBScript ?

  10 mai 2015, par Ravenstine

  I have this VBScript that will take some text from the command line and dictate it to a wav file using MS SAPI.

  Const SAFT48kHz16BitStereo = 39
  
  Const SSFMCreateForWrite = 3
  
  
  
  Set oFileStream = CreateObject("SAPI.SpFileStream")
  
  oFileStream.Format.Type = SAFT48kHz16BitStereo
  
  oFileStream.Open "C:\sample.wav", SSFMCreateForWrite
  
  
  
  Set Sapi = CreateObject("SAPI.SpVoice") 
  
  Set Sapi.voice = Sapi.GetVoices("Name=Microsoft Sam", "Language=409").Item(0)
  
  Sapi.volume = 100
  
  Sapi.rate = 3
  
  Set Sapi.AudioOutputStream = oFileStream
  
  Set args = Wscript.Arguments
  
  Sapi.Speak(args.item(0))

  Is it possible to, instead of write the audio to a file, write it to standard output ? I’d like to be able to pipe the audio directly to FFMpeg without writing to the file system.

• riffdec : Explicitly null-terminate array to work around VC++ bug

  28 janvier 2016, par Bruce Dawson

  riffdec : Explicitly null-terminate array to work around VC++ bug
  Due to this bug in VC++ 2015 Update 1 :
  
  https://connect.microsoft.com/VisualStudio/feedback/details/2291638
  the ’key’ array in ff_read_riff_info() ends up being not null
  
  terminated which led to failures in a Chromium unit tests. Update 2
  
  should have a fix, but until then it is important to avoid problems.
  

  • [DH] libavformat/riffdec.c