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• Decoding aac file with FFmpeg on windows

  6 septembre 2018, par Liron Levy

  I’m trying to follow this example :
  https://github.com/FFmpeg/FFmpeg/blob/master/doc/examples/decode_audio.c

  with the small change of using aac source file, thus changing line 100 :

  codec = avcodec_find_decoder(AV_CODEC_ID_MP2); 

  to

  codec = avcodec_find_decoder(AV_CODEC_ID_AAC);

  this results with a pcm output file which has double the size I would expect it to have and distorted sound.

  What am i missing ? does another line needs to be changed ?
  Does the change from mp2 to aac is more major then it seems ?

• Ndk : Button event error Fatal 11 SIGSEGV when video streaming

  24 avril 2015, par user3773632

  I’m using ffmpeg in ndk, make video streaming service.

  my problem is that Video streaming when the button is pressed, an fatal 11 SIGSEGV error occurs.

  this my source

  protected void onCreate(Bundle savedInstanceState) {
  
      super.onCreate(savedInstanceState);
  
      setContentView(R.layout.fragment_main);
  
  
  
      Log.v("LOG", "CREATE");
  
  
  
      mUHSurfaceView = (UHSurfaceView) findViewById(R.id.uhsurfaceview); 
  
      bCamera = (Button)findViewById(R.id.camera);
  
  
  
      bCamera.setOnClickListener(new OnClickListener() {
  
          @Override
  
          public void onClick(View v) {
  
              // TODO Auto-generated method stub
  
              Log.v("CameraButton", "CameraButton");
  
          }
  
      });

  In ndk using ffmpeg h264 decoding and rgb24 through opengl(GLSurfaceView) screen output.
  I don’t know why occur this error i can’t solve error
  please help me !

  my device : Samsung galaxy s4 mini
  android : 4.2.2

  Thanks.

• Using ffmpeg, the function av_find_input_format("avfoundation") return null

  28 avril 2019, par guojing

  I run this code in iPad mini 4 (Model A1538), iOS 11.2.6

  Try to record audio by FFmpeg.

  av_register_all();
  
  avcodec_register_all();
  
  avdevice_register_all();
  
  
  
  AVFormatContext *pFormatCtx = avformat_alloc_context();
  
  AVDictionary* options = NULL;
  
  av_dict_set(&options,"list_devices","true",0);
  
  AVInputFormat *iformat = av_find_input_format("avfoundation");
  
  printf("==AVFoundation Device Info===\n");
  
  avformat_open_input(&pFormatCtx,"",iformat,&options);
  
  printf("=============================\n");
  
  
  
  if(avformat_open_input(&pFormatCtx,"0",iformat,NULL)!=0){
  
      printf("Couldn't open input stream.\n");
  
      return;
  
  }

  pFormatCtx = NULL, and iformat = NULL.

  Why should this happen, did I missed anything to set ?