Flash 8 Video Encoder, audio/video discrepancy from mpeg

Two questions...
First, more urgently, I've been given an origianl
720xsomething mpeg format video, and I'm trying to bring it over to
flash... I use the flash 8 video encoder, which does a phenomenal
job of keeping video quality while vastly reducing file size, but
in this case, (unlike some others in the past) I'm getting a
bizarre discrepancy between the speed of audio vs. speed of
video... I can't find a way to force the mpeg (or flash encoder
software) to TELL me what the frame rate of the original mpeg is,
and even when i attempt to force it to 24 or 25 during conversion
to flv, it doesn't seem to bother matching it up to the audio...
when i take the result and export it from flash, i'll try, at 24
the video is going too fast for audio, but at 23 its going too
slow...
and this SEEMs related to 2nd question.. I took about 15
solid minutes of video of a particularly nice sunset in
progression, with the hopes of compressing it down to about 30-60
seconds for effect... but it seemed like, no matter what frame rate
I tried to compress it to with the encoder, it just drew each frame
out to a set length, and even if i tried to export the flash really
fast, it remained at the epicly slow frame rate...
is there a relation? what am I doing wrong?
is there a way to detect the ACTUAL frame rate of the
original mpeg... is there a way to force the audio and video to
remained sync'd up? Seems the that problem is, if i go with the
default 'Same as source' I'm left to guess what that might be when
exporting from flash, as nothing ever actually tells me what that
source frame rate actually was! Is there some natural audio
compression business inside mpeg video that works fine for mpeg
video, but the flash encoder can't handle well? I've tried it with
about a billion different frame rate, audio data rate, quality, and
export settings, and have yet to get a sync.
Thanks in advance!

I should have been more clear.
I changed the file name from .vob to .mpg and then tried to
add the video file to Flash 8 Video Encoder and received the
following error message:
"You won't be able to encode this file. Your computer doesn't
have the necessary codec or the file is corrupt."
Currently,
I use ffmpegx to convert the .vob to .dv and then, I import
the .dv into Flash 8 Video Encoder and convert it to a .flv....
I can use ffmpegx to go straight to a .flv, but the file size
is larger b/c the compression is different, not On2 VP6...
I would like to skip the middle step because my files are
very large and it takes extra time.

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