What does it mean if Android MediaCodec dequeueOutputBuffer returns -1? -

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i followed official android documentation setup encoder audio input using mediacodec object. method dequeueoutputbuffer in code below returns -1. return value mean?

my code:

/*configuarion of mediacodec object*/ codec = mediacodec.createencoderbytype("audio/mp4a-latm"); mediaformat format = new mediaformat(); format.setstring(mediaformat.key_mime, "audio/mp4a-latm"); format.setinteger(mediaformat.key_channel_count, 1); format.setinteger(mediaformat.key_sample_rate, 44100); format.setinteger(mediaformat.key_bit_rate, 64 * 1024); format.setinteger(mediaformat.key_aac_profile,mediacodecinfo.codecprofilelevel.aacobjecthe); codec.configure(format, null, null, mediacodec.configure_flag_encode);  codec.start();  bytebuffer[] inputbuffers = codec.getinputbuffers();  bytebuffer[] outputbuffers = codec.getoutputbuffers();  /*main loop encode audio data*/  (;;) {    int inputbufferindex = codec.dequeueinputbuffer(-1); -->this never 0 data should written correctly!    if (inputbufferindex >= 0) {       // write data audiorecord in queue      inputbuffer = inputbuffers[inputbufferindex];      inputbuffer.clear();       inputbuffer.put(buf);-->data audiorecord object       encoder.queueinputbuffer(inputbufferindex, 0, buf.length, 0, 0);      codec.queueinputbuffer(inputbufferindex, ...);     }     int outputbufferindex = codec.dequeueoutputbuffer(bufferinfo, 0);-------->>> "-1"    if (outputbufferindex >= 0) {         //do never called because outputbufferindex -1??

getting -1 return value when have passed non negative timeoutus indicates call dequeueoutputbuffer has timed out. according android sample, returns following integer

 public static final int info_try_again_later = -1;

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