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Old November 28th, 2013, 02:58 PM   #1
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Script to trim event front end

Looking for a script to trim just the leading edge of events to compensate for the audio lag in AVCHD files coming out of my DSLR (GH-3). These particular clips are all 1080p60 at 24Mbps. Using Vegas Pro 12.0, latest build.

Ed Troxel, if you're listening, the Set Duration script in Excalibur would do the trick, except it trims the end of each event, and there's no apparent way to tell it to trim the leading edge. The old Trim Front and Back.js script doesn't appear to work with Vegas 12.

For those who may want to offer other suggestions,I have already attempted the following, with no success:
- using two different TS merge Utilities (resulting files are the correct size, but Vegas can only see about the first eight seconds of each one, regardless of the overall length.) This technique normally works very well, but this is the first time I've tried it on 60p files at this bit rate.
- Short overlaps when placing the clips on the timeline (this would work if it were not for the fact that a significant number of clips have a 17 frame dead spot at the beginning, which is too long to do a quick dissolve without it being noticeable.)
- Conversion then merge into a large QuickTime file (file is seen by Vegas just fine, but has audio gaps embedded within it beginning of each former clip.)
- importing of clips directly from camera using Sony Vegas Device Manager (clips still have missing audio and take 10 times as long to import.)
- Importing of clips from SD card using Panasonic's import utility (clips still are missing audio and import directory is now choked with additional mysterious files.)

TIA,
Alan

Last edited by Alan Fitch; November 28th, 2013 at 03:02 PM. Reason: additional information
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Old November 28th, 2013, 04:34 PM   #2
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Re: Script to trim event front end

how are you importing the files in to vegas?
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Old November 28th, 2013, 05:02 PM   #3
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Re: Script to trim event front end

In addition to the ways mentioned in my posting, there is the standard way as well. The other import methods don't apply as it's not coming in from a camera DVD or in MXF format.

I'm a Vegas user since Version 3, so am very familiar with the program.

Alan
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Old November 28th, 2013, 05:53 PM   #4
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Re: Script to trim event front end

sorry alan, missed your explanation of importing...

you might try posing the same question over at scs forum - i know there's at least three people there shooting with gh3.
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Old November 29th, 2013, 12:24 AM   #5
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Re: Script to trim event front end

Alan, what format is the Hard Drive you are capturing the footage to? FAT32 or NTFS?

Grazie
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Old November 29th, 2013, 05:38 AM   #6
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Re: Script to trim event front end

Alan, if you' want to ask Edward Troxel about Excalibur why not try the jetdv.com forum?

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Old November 29th, 2013, 08:22 AM   #7
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Re: Script to trim event front end

Edward posted a script called "ChopOffFront.js" on the Sony scripting forum some time ago that may do what you need.
Delete n frames at event boundaries

edit: I just tried it and got 3 errors. My guess is that it's because the script is very old and Sony has changed a lot of things over time with respect to the scripting.

Last edited by Mike Kujbida; November 29th, 2013 at 09:52 AM.
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Old December 2nd, 2013, 02:31 PM   #8
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Re: Script to trim event front end

Take a look at this old script: TrimFront+Back.js (also posted on your message at jetdv.com)

Code:
/**
 * This script will trim the front and back for all selected events.
 *
 * Written By: Edward Troxel
 * Copyright 2004 - JETDV Scripts
 * Modified: 08-03-2005
 **/

import System;
import System.IO;
import System.Windows.Forms;
import Sony.Vegas;


var trimAmt = new Timecode("00:00:01:00");


try {

  //Go through the list of Tracks
  var trackEnum = new Enumerator(Vegas.Project.Tracks);
  while (!trackEnum.atEnd()) {
    var track : Track = Track(trackEnum.item());

    //Go through the list of Events
    var eventEnum = new Enumerator(track.Events);
    while (!eventEnum.atEnd()) {
      var evnt : TrackEvent = TrackEvent(eventEnum.item());

      if (evnt.Selected) {
        var dStart = evnt.Start + trimAmt;
        var dLength = evnt.Length;

   //Get current take offset
   var tke = evnt.ActiveTake;
   var tkeoffset = tke.Offset;
   tkeoffset = tkeoffset + trimAmt;
        evnt.Start = dStart;
   tke.Offset = tkeoffset;
   
        dLength = dLength - trimAmt - trimAmt; //Remove the second - trimAmt to trim only the front.
        evnt.Length = new Timecode(dLength);   
      }
      eventEnum.moveNext();
    }
    trackEnum.moveNext();
  }


} catch (e) {
    MessageBox.Show(e);
}
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