func av_new_stream(ctx *FormatContext, stream_id int) *Stream { return &Stream{C.av_new_stream(ctx.ctx, C.int(stream_id))} }
func av_new_stream(ctx *FormatContext, stream_id int) *C.AVStream { //return &Stream{C.av_new_stream(ctx.ctx, C.int(stream_id))} return C.av_new_stream(ctx.ctx, C.int(stream_id)) }