func (this *FmtCtx) GetStream(idx int) (*Stream, error) {
if idx > this.StreamsCnt() || this.StreamsCnt() == 0 {
return nil, errors.New(fmt.Sprintf("Stream index '%d' is out of range. There is only '%d' streams.", idx, this.StreamsCnt()))
}
if _, ok := this.streams[idx]; !ok {
// create instance of Stream wrapper, when stream was initialized
// by demuxer. it means that this is an input context.
this.streams[idx] = &Stream{avStream: C.gmf_get_stream(this.avCtx, C.int(idx))}
}
return this.streams[idx], nil
}
func av_get_stream(ctx *C.AVFormatContext, idx int) *C.AVStream {
return C.gmf_get_stream(ctx, C.int(idx))
}