MJPG stream recovery

Dear mpjeg hackers!

I've got an interesting problem: data recovery. I hope that you can
answer me some questions regarding that file format.

Story: We recorded the most cool salsa dancing video ever and deleted it
by accident (right at the camera). I then tried recovery by photorec
--cool program, found everything except what I was looking for. So I
hacked in the bytes...

'RIFF' appeared at every videos start. I've check everything starting
with that 4 bytes, but haven't found the video. So I guess the camera
wrote after deletion above those video header bytes. :-/

The video header is gone (although I've other vids by the same camera).
Is there anything that I should't have lost in the headers?

I've already tried extracting a single frame (which are all marked by
ffd8ffe00) but didn't succeed--eog tells 'huffman table missing'. I've
had a look at Apples Spec (qtff.pdf) but haven't even found out thereby
wheter it's an MJPG-A or -B one.

Do you have any hint or reference how to convert a MJPG-frame to a
(viewable) JPG image? (--without having video headers ^^)

Greetings

Claudio

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