/** 

*

* The script will use exactly one frame from each event on the selected video track, 

* and delete everything else. All gaps between events will be eliminated,

* resulting in a single smooth movie. 

*

* Each event should be from a discrete, separate video file (i.e., make sure 

* "Enable DV Scene Detection" is checked in Vegas Capture).

*

* The script could probably be modified to work on a single file that has been

* broken up into events, but I didin't have time to figure out how to do this, and 

* I figure most time lapse captures would be captured into separate files for each clip

* 

* The main use envisioned for this script is the creation of true time 

* lapse movies from the multiple one-second clips that many camcorders 

* record when put in "time-lapse" mode.

*

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

* Only the first selected track is affected. If more than one video track is selected,

* subsequent tracks are ignored.

*

* This script uses the LAST frame(s) in the event on the theory that the first frame from 

* a time lapse capture may be slightly corrupted from tape startup glitches.

*

* Written By: John Meyer

* Written: October 22, 2003

*

**/ 



import System; 

import System.IO; 

import System.Windows.Forms; 

import SonicFoundry.Vegas; 





/**

**************************************************************************

* Start of main program                                                  *

**************************************************************************

**/



try { 



    //Change the next line to set the number of frames to keep.

    var SaveFrames : Timecode = new Timecode("00:00:00:01");  //This is 1 frame.

    var DeleteTime : double = SaveFrames.ToMilliseconds();    // Convert frames to milliseconds.



    //Global declarations

    var dStart : Double;

    var trackEnum : Enumerator; 

    var evnt : TrackEvent;



    //Use the FindSelectedTrack() function to find the first selected track.



    var track = FindSelectedTrack();

    var eventEnum = new Enumerator(track.Events);



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

      TrimEvent();             // Function that "trims" event down to "n" frames

    }

    Vegas.UpdateUI();  



} catch (e) { 

  MessageBox.Show(e); 

} 



// End of main program



// ***********************************************************************



// Beginning of functions



/**

**************************************************************************

* This function finds the first selected track                           *

**************************************************************************

**/



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;

}





/**

***************************************************************************

* The following function trims all events on the selected track           *

* by "n" (usually 1) frame(s). Only the LAST n frames in the event remain.*

***************************************************************************

**/



function TrimEvent() {



  dStart = 0;                                         // Initialize the starting point.



  //Go through each event on the track.



  while (!eventEnum.atEnd()) {

    evnt = TrackEvent(eventEnum.item());              // Get the next event on the timeline.

    evnt.AdjustStartLength(new Timecode(dStart), new Timecode(DeleteTime), true);

    dStart = evnt.Start.ToMilliseconds()+ DeleteTime; // Next event will start at end of this event.

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

  } 



return null;

}