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• How to stream video using C/C++

  19 janvier 2015, par Arif Ali Saiyed

  I want to stream video to a file/ or memory buffer using VC++ on windows.
  Can anyone suggest easy to integrate library ?(that has one H,one LIB and one DLL).

  I am exploring the libVLC right now and gonna explore FFMPEG also.
  dont want to spend time in building these complex software fully myself, would appreciate any help/pointer/ references.

  ---

  My ultimate goal is to stream a video and consume the stream on HTML5 viewer.
  I tried streaming using VLC media player and streamed to a OGG file, I used same OGG file in a HTML5-Video tag and it worked.

  Now I want to do the streaming part using libVLC instead of VLC media player.
  I want to stream the video file to File or memory stream.

  I have found this sample https://wiki.videolan.org/Stream_to_memory_(smem)_tutorial/

  BUt unsure of how to get started ?
  1) Where do i get the libVLC.dll, libVLC.lib, libVLC.h , Is there any sample visual studio that has everything setup and I can straight begin to write the code using libVLC etc.

  2) Since libVLC is said to depdend on 200+ other libraries/modules/plugins, what will I have include and distribute with my application ?
  http://www.enjoythearchitecture.com/vlc-architecture.html
  https://wiki.videolan.org/Contrib_Status/

  3) streaming format : above example seems to stream into PCM format, cant I get it stream in some format that has better codec and regonized by HTML5 ? For example when i tried using VLC media player , my options were as following
  :sout=#transcodevcodec=theo,vb=800,acodec=vorb,ab=128,channels=2,samplerate=44100:filedst=C :\Users\testUser\stream-output.ogg,no-overwrite :sout-keep

• VLC transcoding RTMP with 12 second delay

  27 août 2015, par astralmaster

  I am using VLC player to receive a RTMP stream from Unreal Media Server and transcode it with ogg/theora for html5 video element. Here is command line code
  I use :

  vlc.exe -I dummy rtmp://XX.XX.XX.XX:5119/live/LRFront :network-caching=0 :sout=#transcode{vcodec=theo,vb=200,scale=1,deinterlace=0,acodec=none}:http{mux=ogg,dst=:8181/stream.ogg} 

  But this produces 10-12 second delay when viewing and even freezes quite often.
  When played directly in flash player (rtmp stream) there is 50ms delay at most. So it has to be something with transcoding.
  Could anyone point me in the right direction ?

  My PC specs :

  CPU : Core i7
  RAM : 16 GB
  GPU : Nvidia Gefore GTX660

• Visual C++ linker can't resolve FFmpeg's external symbols

  25 février 2016, par JustPingo

  I’m making a C++ program and I want to use FFmpeg pre-built for x64, which is a C-compiled library.
  I’m using this code in order to include its header :

  extern "C" {
  
      #include "libavcodec/avcodec.h"
  
      #include "libavformat/avformat.h"
  
  
  
      #pragma comment (lib,"G:/Documents/ffmpeg/lib/avcodec.lib")
  
      #pragma comment (lib,"G:/Documents/ffmpeg/lib/avformat.lib")
  
  }

  I’m then calling the symbols like I would do for a normal function, for example with av_interleaved_write_frame(out->formatContext, &packet);

  However, when I try to compile it with Visual Studio 2015’s built-in C++ compiler, I get a lot of error like

  Error   LNK2019 unresolved external symbol _av_write_trailer referenced in function "void __cdecl closeArenaVideo(struct VideoOutput *)" (?closeArenaVideo@@YAXPAUVideoOutput@@@Z)  Sparta2 c:\Users\Théo\documents\visual studio 2015\Projects\Sparta2\Sparta2\video.obj   

  for basically any of the symbols I’m refering to.

  I tried to import everything in Visual Studio, to compile with command-line, to manually put FFmpeg’s libraries in the default libraries path, without success.

  Thank you in advance !