[Ffmpeg-devel] The question is: how to open the AMR_NB-Codec? (original) (raw)
Lars Blumberg Lars.Blumberg
Fri Feb 17 12:55:40 CET 2006
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How do I have to initialize the codec with codec id CODEC_ID_AMR_NB ?
I use the output_example.c :
/*
add an audio output stream */ AVStream *add_audio_stream(AVFormatContext *oc, int codec_id) { AVCodecContext *c; AVStream *st;
st = av_new_stream(oc, 1); if (!st) { fprintf(stderr, "Could not alloc stream\n"); exit(1); }
c = st->codec; c->codec_id = codec_id; c->codec_type = CODEC_TYPE_AUDIO;
/* put sample parameters */ c->bit_rate = 64000; c->sample_rate = 44100; c->channels = 2; return st;
}
To open the audio stream the following instructions are used:
void open_audio(AVFormatContext *oc, AVStream *st) { AVCodecContext *c; AVCodec *codec;
c = st->codec;
/* find the audio encoder */
codec = avcodec_find_encoder(c->codec_id);
if (!codec) {
fprintf(stderr, "codec not found\n");
exit(1);
}NOW the codec cannot be opened >>>>>>
/* open it */
if (avcodec_open(c, codec) < 0) {
fprintf(stderr, "could not open codec\n");
exit(1);
}... }
Is there any initialization missing for the AMR_NB codec to open it?
Thanks in advance for any help
Lars
"Lars Blumberg" <Lars.Blumberg at aquasoft.de> schrieb im Newsbeitrag news:dt2pu0$2n7$1 at sea.gmane.org...
Hello!
Has anyone tried the outputexample.exe with a 3gp-filename? I therefore included the AMR NB audio codec, described at http://www.allaboutsymbian.com/archive/t-22589 I am able to convert video files to 3gp file with ffmpeg.exe (with sound), but I can not generate a 3gp output example with "outputexample.exe test.3gp". The message is, that the audio codec cannot be opened. I also tried different bit rates and sample rates in outputexample.c but the error message is still the same. Thanks for any help in advance! Lars
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