- st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
- st->codec->codec_tag = id;
- st->codec->codec_id = codec;
- st->codec->channels = channels;
- st->codec->sample_rate = rate;
- av_set_pts_info(st, 64, 1, rate);
+ st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
+ st->codecpar->codec_tag = id;
+ st->codecpar->codec_id = codec;
+ st->codecpar->channels = channels;
+ st->codecpar->channel_layout = channels == 1 ? AV_CH_LAYOUT_MONO :
+ AV_CH_LAYOUT_STEREO;
+ st->codecpar->sample_rate = rate;
+ avpriv_set_pts_info(st, 64, 1, rate);