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• Free music recognition API

  12 March 2014, by AmirH

  I'm developing an application to recognize the music played by speakers. It records 32 seconds of the sound played and send a request via an API of music recognition. So far I used Echonest. But my api_key has been banned because of to many requests since I published my freeware, used by more than 200 users.

  So I looked for MusicBrainz but it needs the exact duration of the entire song to receive a acceptable response, duration that my application can't guess.

  So I'm looking for a free music recognition API so my freeware works. Do you know one?

  Note: I used Echonest by :

  • capturing 32 seconds with ffmpeg

  • sending this command via cURL :

    curl -F "api_key=XXX" -F "filetype=mp3" -F "track=@sound.mp3" "http://developer.echonest.com/api/v4/track/upload" > info.txt

  I tried to use MusicBrainz by :

  • capturing 32 seconds with ffmpeg

  • generating the fingerprint using Chromaprint with this command :

    fpcalc sound.mp3 > fingerprint.txt

  • sending this command via cURL :

    curl -F "client=XXX" -F "meta=recordings" -F "duration=32" -F "fingerprint=ABC" "http://api.acoustid.org/v2/lookup" > info.txt

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

  24 April 2015, by 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 April 2019, by 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?