[Khursheed Fateh]

No. I do not think so. I posted my answer after testing and I just tested it again 🙂
If fps of input and output clip is same you will get the required effect using method described by me.

If fps of input clip is 30 and fps of output clip is 60 and you shrink your input clip to 50% using time stretch method then you will get all frames of your input clip in your output clip and get fast forward effect. etc.

kFateh

[Khursheed Fateh]

1) Select Clip in timeline
2) Use following method (a) or (b)
(a) From Menu (on top of after effects window) select “Layer / Time / Time Stretch…”
(b) Right click on clip and from Shortcut Menu select “Time / Time Stretch…”
3) A window will pop-up with title “Time Stretch”.
4) Here you can change length of clip in two ways.
(I) By entering value for “Stretch Factor” in %. Give value less then 100 for “Fast forward” and value more then 100 for “Slow motion”.
(II) By entering value for “New Duration” in actual time. Reduce time for “Fast forward” and increase time for “Slow motion”.

**In your case try giving value of 3.33 %.

(f/nf * 100) %
f = No of equally distant frames required from nf (I am using 1)
nf = No of frames per second (I am using 30)

=>(1/30*100) %
=>3.33333 %