New to Adobe After Effects (CS4)

i'm relatively new ae , have basic question:  can after effects import , work long files - 1+ hours or more?

 

i have thought of ae tool small clips less 10min. i'm new , not know.

 

i working on research project harvard university , university of michigan.  studying educational practices in classrooms around country.  these "observations" conducted remotely using web interfaced camera.  files being given lower quality asf files. 

 

in cases identity of students must masked - can work in premiere pro.  in other cases entire video needs "identity concealing" treatment - these files i'm hoping edit within ae.  i'm looking @ using toonit's rotoscoping filter this.  when use toonit in ppro slow (many hours) process.

 

also, advise on working asf files helpful.

 

i forgot mention file details:

 

352 x 240 (1.0)

7980+01, 30.00 fps

8000 hz - 16-bit - mono

 

i not know of means "7980+01" - not clue.

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