@jetdv @davebo

You don't need to rename the file, just rename the active take name, unless that's what you meant. After experimenting, I was able to add a suffix to the active take name consisting of the string such as "fps:59.940_". A more exact rate is actually displayed. I was adding it to the end of the name, but most times the fps couldn't be read because of the relative width of the event vs. the visible timeline doesn't provide enough room for the whole name to show, so I added it before the name.

Still, it seems, that the easiest way to see the frame rates is in the Project Media window in Detail view. The frame rate is unfortunately way down the other end of the column headers, so you have a chore dragging the column so it's near the name column. If you want to know where the media is on the timeline, you can right-click and select "select event(s) on timeline."

If you run the scripts multiple times, the fps will be added multiple times. Ctrl-Z will undo the appends.

//  Filename: ShowFPS_Script.cs
//  Appends FPS to active take names of selected event(s).
//  Adapted by Robert J Johnston from JetDV scripts

using System;
using System.Windows.Forms;
using ScriptPortal.Vegas;

namespace ShowFPS_Script
{
    public class Class1
    {
        public Vegas myVegas;

    public string fpsPrefix = "fps:";

        public void Main(Vegas vegas)
        {
            myVegas = vegas;

            foreach(Track track in myVegas.Project.Tracks)
            {
                foreach (TrackEvent evnt in track.Events)
                {
                    if (evnt.Selected)
                    {
                        if (evnt.IsAudio())
                        {
                            // do nothing for now.

                        }
                        else
                        {
                            VideoEvent ve = (VideoEvent)evnt;
                            VideoStream vs = (VideoStream)ve.ActiveTake.MediaStream;
                            
                            // To show -- or not to show -- these two message boxes:
                            //MessageBox.Show("Frame Rate: " + vs.FrameRate);
                            //MessageBox.Show("PlaybackRate: " + ve.PlaybackRate);
                            
                            // Append fps prefix to active take name
                            ve.ActiveTake.Name = fpsPrefix +  vs.FrameRate.ToString() + "_"+ ve.ActiveTake.Name;
                            myVegas.UpdateUI();
                        }
                    }
                }
            }
        }
    }
}

public class EntryPoint
{
    public void FromVegas(Vegas vegas)
    {
        ShowFPS_Script.Class1 test = new ShowFPS_Script.Class1();
        test.Main(vegas);
    }
}