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• RTSP streaming on Android client using FFMpeg

  10 août 2013, par rurtle

  I am working on a hobby project the goal for which is to develop an Android application capable of streaming live feeds captured through web cams in a LAN setting using FFMpeg as the underlying engine. So far, I did the following -

  A. Compiling and generating FFMpeg related libraries for the following releases -

  FFMpeg version : 2.0
  NDK version : r8e & r9
  Android Platform version : android-16 & android-18thisthisthisthis
  Toolchain version : 4.6 & 4.8
  Platform built on : Fedora 18 (x86_64)
  

  B. Creating the files Android.mk & Application.mk in appropriate path.

  However, when it came to writing the native code for accessing appropriate functionality of FFMpeg from the application layer using Java, I'm stuck with following questions -

  a) Which all of FFMpeg's features I need to make available from native to app layer for streaming real-time feeds ?
  b) In order to compile FFMpeg for Android, I followed this link. Whether the compilation options are sufficient for handling *.sdp streams or do I need to modify it ?
  c) Do I need to make use of live555 ?
  

  I am totally new to FFMpeg and Android application development and this is going to be my first serious project for Android platform. I have been searching for relevant tutorials dealing with RTSP streaming using FFMpeg for a while now without much success. Moreover, I tried the latest development build of VLC player and found it to be great for streaming real-time feeds. However, it's a complex beast and the goal for my project is of quite limited nature, mostly learning - in a short time span.

  Could you suggest some pointers (e.g. links, documents or sample code) on how can I write the native code for utilizing FFMpeg library and subsequently use those functionality from the app layer for streaming real-time feeds ? Moreover, will really appreciate if you could let me know the kind of background knowledge necessary for this project from a functional standpoint (in a language agnostic sense).

• FFMPEG Streaming using RTMP

  20 février 2014, par desto

  I'm trying to create a stream using ffmpeg to send a video to a Red5 Server. I've already managed to do this using this command :

  ffmpeg -re -y -i "Videos\Video1.mp4" -c:v libx264 -b:v 600k -r 25 -s 640x360 -t 40 -vf yadif -b:a 64k -ac 1 -ar 44100 -f flv "rtmp://192.168.0.12/live/videostream"

  My problem is, when ffmpeg finishes encoding the video, it stops the stream, and thus cuts the video short for 5-10 seconds (for short videos), but this gets worse on larger videos.

  Is there a way to stop this behavior ?
  I was trying to add a blank 10 second video before and after the original video, but due to some encoding options, I always end up losing audio. And this only kind-of works on the short videos, but on longer videos the problem is still there.

  Any recommendations ?

• deprecated error calling C function in C virtual function

  25 juillet 2013, par wolfz

  when i call C function use : : operation in C++ virtual function,
  it always occurs the error as follows.

      D:/player/jni/lib/DllAvCodec.h:119:120: warning: 'avcodec_encode_audio' is deprecated [-Wdeprecated-declarations]
  
      virtual int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size, const short *samples) { return ::avcodec_encode_audio(avctx, buf, buf_size, samples); }
  
                                                                                                                     ^

  and that i called the extern "C" in the head, but the error still occur.
  my code is :

   extern "C" {
  
   #include <libavcodec></libavcodec>avcodec.h>
  
   }
  
   ......
  
    virtual int avcodec_encode_audio(AVCodecContext *avctx, uint8_t *buf, int buf_size, const short *samples) { return ::avcodec_encode_audio(avctx, buf, buf_size, samples); }
  
   ......