[Libav-user] Can't retrieve Sample Format

[jan hölscher]

2012/4/24 Goo Creations <goocreations at gmail.com>

> Hi all,
>
> I've been stuck with this problem for a while now. When opening a file and
> doing the following:
>
> AVCodecContext *codecContext = NULL;
> AVFormatContext *formatContext = NULL;
> AVCodec *codec;
>
> avformat_open_input(&formatContext, "a.flac", NULL, NULL);
> int streamId = av_find_best_stream(formatContext, AVMEDIA_TYPE_AUDIO, -1,
> -1, &codec, 0);
> codecContext = formatContext->streams[streamId]->codec;
>
> cout<<codecContext->sample_fmt<<endl;
>
> It returns -1 (AV_SAMPLE_FMT_NONE). If I use the terminal tool (ffmpeg -i
> a.flac) it says s32 under the stream info. So what am I doing wrong that my
> code does not return the sample format? I can retrieve other info such as
> the sample rate.
>
> Thanks
>
> Chris
>
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> Libav-user at ffmpeg.org
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>
>
try "avformat_find_stream_info"
http://www.ffmpeg.org/doxygen/trunk/group__lavf__decoding.html#gd42172e27cddafb81096939783b157bb

before using "av_find_best_stream"


-- 
*Media Encoding Cluster <http://codergrid.de>, *
*the first Open Source Cluster Encoding Solution *
*for distributed Media Encoding.*
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