How to find a trackitem with QE scripting

[Cad81]

I need to find a track item through the QE functions. I saw that getItemAt (number) exists but I didn't understand exactly what number to pass to the function.

var num = (mainSeq.videoTracks.numTracks)-1;
var insertedSub = main.getVideoTrackAt(num).getItemAt(???????);

Or is there another particular way to find a track item or an array of track items in QE?

With the basic functions I would use:

var insertedSub = mainSeq.videoTracks[0].clips;

but I need to work with QE for this operation.
Thanks  a lot.

[Bruce Bullis · Accepted solution]

> I need to find a track item through the QE functions.

As previously stated, the QE DOM is officially unsupported, and not recommended.

[TVMStern]

Using QE DOM you must know that clips and gaps in tracks are the same. For example, if your sequence contents only one trackitem at TC (00:00:01:00 - 00:00:04:00), its index is 1, and index 0 has gap at TC (00:00:00:00 - 00:00:01:00). You must create the function for translating clip indexes into QE DOM clip indexes. It's not difficult. 

[Cad81]

Thank you!