reg[63:0] s_axis_video_in_0_tdata_in;
data_file = $fopen("./stream_data.txt", "r");
if(data_file == 0) begin
        $display("data_file handle was NULL");
        $finish;
 end

if (!$feof(data_file)) begin
                  //use captured_data as you would any other wire or reg value;
        $fscanf(data_file, "%lln", s_axis_video_in_0_tdata_in);
end
else begin
    // EOF means end simulation
    $finish;
end