[Libav-user] AAC encoding question

[Justin]

Hi,
 
    I am trying to encode audio using the AAC audio encoder with the program below, but when I call the avcodec_open2 funtion, the function always return -733130664. I don't know where is wrong in it. I'll very appreciate someone who can point out the wrong.
 
note:if the codec AV_CODEC_ID_AAC is changed as AV_CODEC_ID_MP2, the avcodec_open2 can return 0 successfully!
 
============program=================
main()
{
 int ret;
 AVCodec *codec;
 AVCodecContext *c;
 AVFrame *frame; 
 
 avcodec_register_all();
 codec = avcodec_find_encoder(AV_CODEC_ID_AAC);
 if (!codec)  return;
 //avcodec_register(codec);
 c = avcodec_alloc_context3(codec);
 if (!c)  return;
 
 c->bit_rate = 64000;
 c->sample_rate    = 44100;
 c->channels       = 2;
 c->frame_size = 88200;
 c->sample_fmt = AV_SAMPLE_FMT_S16;
 // open it 
 ret = avcodec_open2(c, codec, NULL);
 if (ret >= 0)  printf("OK\r\n");
}
 
Best Regards,
Justin
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