/** 

* PURPOSE OF THIS SCRIPT:

*

* Fix a bad video frame by deleting bad frame and replacing with previous frame.

*

* A video track must be selected. If an audio track is selected, nothing happens.

*

* To use, select the event that contains the bad frame. Position the cursor so you can

* see the bad frame in the preview window. Then, run the script.

* 

* Copyright © John Meyer 2006

* Written: June 23, 2006

*

**/ 



import System; 

import System.IO; 

import System.Windows.Forms; 

import Sony.Vegas; 





try { 



  //Global declarations

  var dStart : Double;

  var dLength : Double;

  var dCursor : Double;

  var trackEnum : Enumerator; 

  var evnt : VideoEvent;

  var evnt2 : VideoEvent;

  var one_frame = Timecode.FromFrames(1);



  var track = FindSelectedTrack();                // Use this function to find the first selected track.  



  if (track.IsVideo()) {                          // Proceed only if selected track is video track.

    var one_frame = Timecode.FromFrames(1);

    var eventEnum  = new Enumerator(track.Events);

    dCursor = Vegas.Cursor.ToMilliseconds();      // Remember the cursor position.



    //Go through each event on the track.

    while (!eventEnum.atEnd()) {

      evnt = (eventEnum.item());



      // Get the event's start and length timecode, in milliseconds.

      dStart = evnt.Start.ToMilliseconds();

      dLength = evnt.Length.ToMilliseconds();



//    If the cursor timecode is between the beginning and end of the 

//    event timecodes, then split the event, delete first frame from event to right of split.

//    Copy last frame from event to left of split and put into the one-frame gap.



      if ( (dCursor > dStart) && ( dCursor <= (dLength + dStart) ) ) {

        var patch_frame : VideoEvent =  VideoEvent(evnt.Copy(VideoTrack(track),Vegas.Cursor));



        // Make first frame of new event equal frame to left of cursor (for all takes)

        for (var i=patch_frame.Takes.Count - 1; i >= 0; i--) {

          patch_frame.Takes[i].Offset = patch_frame.Takes[i].Offset + Vegas.Cursor - one_frame - evnt.Start;  // Make change for ALL takes.

        } 



        patch_frame.Start = Vegas.Cursor;     // Move new event to right of cursor.

        patch_frame.Length = one_frame;       // Truncate event to only one frame in length.



        evnt.Split (Vegas.Cursor - evnt.Start);



        // Next several lines truncate start of NEXT event by one frame.

        eventEnum.moveNext();                 // Go to next event on this timeline.

        evnt2 = VideoEvent(eventEnum.item()); // Get next event.

        evnt2.AdjustStartLength(evnt2.Start+one_frame, evnt2.Length-one_frame, true);



        if (evnt.IsGrouped) {                 // Add new events to existing grouping.

          var grp : TrackEventGroup = evnt.Group;

          grp.Add(evnt2);

          grp.Add(patch_frame)

        }



      } // End if dCursor ...



      eventEnum.moveNext(); // Go to next event on this timeline.



    } // End While



  } // End If Track



  else {

    MessageBox.Show("You must select a video track.");

  }



} catch (e) { 

  MessageBox.Show(e); 

} 



// End of main program







// Beginning of functions



function FindSelectedTrack() : Track {

  trackEnum = new Enumerator(Vegas.Project.Tracks);

  while (!trackEnum.atEnd()) {

    var track : Track = Track(trackEnum.item());

    if (track.Selected) {

      return track;

    }

    trackEnum.moveNext();

  }

  return null;

}