case AVMEDIA_TYPE_AUDIO:
avfilter_copy_buf_props(filtered_frame, picref);
filtered_frame->pts = frame_pts;
+ if (!(ost->st->codec->codec->capabilities & CODEC_CAP_PARAM_CHANGE) &&
+ ost->st->codec->channels != av_frame_get_channels(filtered_frame)) {
+ av_log(NULL, AV_LOG_ERROR,
+ "Audio filter graph output is not normalized and encoder does not support parameter changes\n");
+ break;
+ }
do_audio_out(of->ctx, ost, filtered_frame);
break;
default: