convert rootitem into sequence[index] script premiere

[Krishna Kumar22556352ieq8]

how to convert  from  app.project.rootItem.children[index] to this 

 app.project.sequences[index]

 app.project.sequences[index].videoTracks.numTracks   

or 

id or projectitem are not working.

i cannot access these properties that sequence[index] can be accessed please do help.

[Bruce Bullis · Accepted solution]

All sequences are projectItems; not all projectItems are sequences. 

You can use the projectItem.isSequence() method to identify sequences; you can also iterate across app.project.sequences, to access all sequences in a project.

[TVMStern]

In addition of Bruce's receipt. If you have a sequence as the definite ProjectItem or TrackItem object you have to compare "nodeId" in all of sequence[i].projectItem objects and your projectItem (or TrackItem.projectItem) objects in cycle.