If you use a digital camera ALL of the frames are numbered in each 'take'.
100 half interlace frames per second here (120 in USA, etc).  Most editing
equipment (read digital videotape machine) can easily extract the seconds
and frame number within each second from the digital data stream.

I'm sure that a little research will let you know how easy it is to tap into
the time code data as it is recorded and played back.  Then you just need
some memory to record the time, tilt and pan data.

Bye.  (and let us know what you find out).

        -----Original Message-----
        From:   Jim Ruxton [SMTP:cinetron@PASSPORT.CA]
        Sent:   Saturday, 19 August 2000 8:28
        To:     PICLIST@MITVMA.MIT.EDU
        Subject:        [OT] Interesting Project looking for solutions

        I am helping a local artist create something that will probably end
up
        with a PIC or 2 in it. I'm just wondering if anyone has any
suggestions
        as to the best way to tackle this project. I am building a motorized
        pan/tilt head which will initially hold a video camera. He wants to
move
        the pan/tilt head while recording a scene. As well as recording
video he
        wants to record the pan/tilt motion. I am using d.c. motors with
optical
        encoders so I can record the position over time. I'll use either a
LM629
        or perhaps the PIC based servo I.C.s from JR. Kerr to control and
record
        the motion. Once this info is recorded he wants to edit a number of
        things he shot together , and play it back through a projector
mounted
        on the pan/tilt head. The recorded motion will also play back
        simulaneously. My biggest challenge as I see it is synchronizing the
        video and motion system. I was thinking of using the audio tracks on
the
        video to hold the data. I'm not sure how much data I can pack onto
the
        audio track. Does anyone know if this is feasible. Any suggestions
or
        thoughts would be appreciated. Thanks!
        Jim

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