/* read frames from the file */
    while (av_read_frame(fmt_ctx, &pkt) >= 0) {
        //decode_packet(&got_frame, 0);
        if (audio_stream_idx == pkt.stream_index)
            printf("Frame found!\n");
        else
            continue;
        fwrite(pkt.data, 1, pkt.size, audio_dst_file);
    }