Better try to edit your video file externally using Adobe premier or try with media encoder to crop it out. and again the embed the clip on the timeline. you get solved.
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I encountered a similar problem. Here is how I solved it.
First, just to be clear:
Deleting frames from individual layers - To add frames to individual layers of your movie, the keyboard shortcut is: F5 (select layers, then click F5). To delete them, usually all you need to do is select the frames you wish to delete and then use the keyboard shortcut Shift+F5 (Windows).
Deleting frames from all layers of the movie (global) - Similarly, to add frames to all layers of your movie, place your cursor in the timeline at the top, and use the same keyboard shortcuts noted above.
What I discovered was that any CLOSED folders included in my movie layers causes Flash to refuse to delete frames when I try to delete them globally. So I tried manually opening all my folders. Still no luck. Then I tried placing my cursor in the layers on one of my open folders, right-clicked to open context sensitive menu, and chose "Expand all folders". And voila. I was able to then place my cursor in the timeline and delete frames globally using the usual Shift+F5 command.
Please try this and let me know if you achieve success. I know how irritating this can be!
This was helpful! Once I expanded everything, I could select and delete. Flash appears to have cut out the part I wanted, but when I run after publish, the audio is out of sync, it's seems like it cut the audio from the end towards the front, not chop out the piece I thought I removed in the middle.
Thanks for the response!
I have cs5 on 32 bit products you mention seem to require 64
thats why I suggested to do the things from the editing software to still have your audio to be sync.