Note that all these utilities (MediaInfo, GSPot) read media attributes from the file headers and if
Field Order flag is wrong, they won't help you. Some video file formats do not contain information about field order.
The best way to identify the correct field order (100%) is to use external TV monitor. There are some utilities (like AVISynth scripts or Vegasaur
Field Order Analyzer) that can help you to identify the correct field order without such monitors (just using Vegas Preview Window)