[Ffmpeg-devel] Re: The question is: how to open the AMR_NB-Codec?
Lars Blumberg
Lars.Blumberg
Fri Feb 17 18:30:03 CET 2006
Hello!
>> Try using legal values for the sample parameters for AMR eg.
>> c->bit_rate = 12200;
>> c->sample_rate = 8000;
>> c->channels = 1;
I already tried different settings for bitrate, samplerate und channels. It
didn't work. Maybe I have to do specify more settings for AMR-NB?
Lars
-----Original Message-----
From: ffmpeg-devel-bounces at mplayerhq.hu
[mailto:ffmpeg-devel-bounces at mplayerhq.hu] On Behalf Of Lars Blumberg
Sent: Friday, February 17, 2006 3:56 AM
To: ffmpeg-devel at mplayerhq.hu
Subject: [Ffmpeg-devel] The question is: how to open the AMR_NB-Codec?
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 output_example.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
> "output_example.exe test.3gp". The message is, that the audio codec
cannot be opened.
>
> I also tried different bit rates and sample rates in output_example.c
> but the error message is still the same.
>
> Thanks for any help in advance!
>
> Lars
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