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• Live Video Chat for iPhone and HTTP Live Streaming

  2 novembre 2014, par mayuur

  So generally, I want to make an app which has video chat functionality for iPhone. But after many searches, I am still not able to find any successful results. Is there any public or even for that matter, private API available for doing this on iPhone ??? If you have an YES answer, please help me.

  Basically, what I want is to read the streams of the video on both the devices connected for chatting. Thanks a lot in advance and please help me if you can.

  p.s - I have already checked iDoubs but it failed and always shows some unknown problem and for that reason, doesn’t allow me to connect to anyone.

  ALSO : The suggested method I have found is via HTTP Live Streaming. But, in that too, I have multiple doubts.

  1.) I need to find how do I upload my video from iPhone to the HTTP server from where I would be broadcasting ?

  2.) Can you please post something related to setting up the server ? How do I feed the video to the FFMPEG Server ?

  Mainly, I need to find the upload method. I am right now simply sending hex-code in the form of NSDATA to the server and I am stuck there. The main problem is, It is live. How do I handle that ?

  It would be best, if you could help me make the iDoubs work properly.

  Thank you so much for any kind of support !

• Linking against libx264 does not work (Cygwin)

  11 novembre 2011, par Erik

  I want to use libx264 in one of my projects on windows. I compiled x264 with cygwin including the shared and static library. Everythin works out fine, also the static and dynamic libraries are properly installed in cygwin.

  When trying to compile another project that uses libx264 (gcc ... -lx264) I get an error :

  /cygdrive/c/Users/Erik/workspace/test/Debug/../main.cpp:406: undefined reference to `x264_param_default_preset(x264_param_t*, char const*, char const*)'
  
  /cygdrive/c/Users/Erik/workspace/test/Debug/../main.cpp:425: undefined reference to `x264_param_apply_profile(x264_param_t*, char const*)'

  The linker seems to have problem with my built libraries of libx264, but what is exactly wrong here ? How can I correctly link x264 ?

  The full build output looks like this :

  Build of configuration Debug for project test **

  make all 
  
  Building target: test.exe
  
  Invoking: Cygwin C++ Linker
  
  g++ -L"/cygdrive/c/Program Files (x86)/Microsoft SDKs/Windows/v7.0A/Lib" -L"/cygdrive/c/Program Files (x86)/Microsoft DirectX SDK (June 2010)/Lib/x86" -L/usr/local/lib -o "test.exe"  ./main.o   -lx264.dll -lKernel32 -lUser32 -lgdi32 -lwinspool -lcomdlg32 -ladvapi32 -lshell32 -lole32 -ld3dx9d -ld3d9 -loleaut32 -luuid -lm
  
  ./main.o: In function `_Z8InitX264ii':
  
  /cygdrive/c/Users/Erik/workspace/test/Debug/../main.cpp:406: undefined reference to `x264_param_default_preset(x264_param_t*, char const*, char const*)'
  
  /cygdrive/c/Users/Erik/workspace/test/Debug/../main.cpp:425: undefined reference to `x264_param_apply_profile(x264_param_t*, char const*)'
  
  collect2: ld returned 1 exit status
  
  make: *** [test.exe] Error 1
  
  
  
  **** Build Finished ****

  Thanks for your help !

• Change file format from flv to anything android will play

  19 octobre 2011, par Bilthon

  I need to take this file which encoded is in h264 but in a flv container and just put it in a mp4, 3gp or whatever file format the android MediaPlayer will understand.

  I want to do this natively. As I will not be decoding nor encoding anything I think I will not be wasting a lot of power (am I wrong ?)

  I followed the instructions from here http://www.roman10.net/?p=394 and could sucessfully compile and use ffmpeg and use it with mp4 and 3gp files.

  But when it comes to flv files it fails. I understand there is no format definition for flv files in that specific port of ffmpeg for android.

  There is no libavformat/flv.h header file for instance.

  Maybe that's why this works :

  extern AVInputFormat ff_mov_demuxer ;
  av_register_input_format(&ff_mov_demuxer) ;

  While this fails :

  extern AVInputFormat ff_flv_demuxer;
  
  av_register_input_format(&ff_flv_demuxer);

  Question is, is there a light at the end of the tunnel ? has someone done something similar ? is it useful ? I mean, I can always just throw the flv media file into a flash player and voila.. the thing is that this would be a parcial solution, as it will not work for all those folks running slower devices that can't yet run Flash.

  Nelson

  PS. Just in case. Here's some info about the file I'm talking about :

  ffmpeg -i rio.flv 
  
  ffmpeg version N-32624-gea8de10, Copyright (c) 2000-2011 the FFmpeg developers
  
    built on Sep 15 2011 23:31:42 with gcc 4.5.2
  
    configuration: --enable-libfaac --enable-libmp3lame --enable-librtmp --enable-libtheora --enable-libx264 --enable-libxvid --enable-gpl --enable-nonfree
  
    libavutil    51. 16. 0 / 51. 16. 0
  
    libavcodec   53. 15. 0 / 53. 15. 0
  
    libavformat  53. 12. 0 / 53. 12. 0
  
    libavdevice  53.  3. 0 / 53.  3. 0
  
    libavfilter   2. 42. 0 /  2. 42. 0
  
    libswscale    2.  1. 0 /  2.  1. 0
  
    libpostproc  51.  2. 0 / 51.  2. 0
  
  
  
  Seems stream 0 codec frame rate differs from container frame rate: 2000.00 (2000/1) -> 14.99 (15000/1001)
  
  Input #0, flv, from 'rio.flv':
  
    Duration: 00:01:00.06, start: 0.000000, bitrate: 783 kb/s
  
      Stream #0.0: Video: h264 (Main), yuv420p, 704x480 [SAR 10:11 DAR 4:3], 14.99 tbr, 1k tbn, 2k tbc