Author Topic: 2 hour long video?  (Read 1676 times)

ijgabor

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2 hour long video?
« on: May 20, 2015, 06:47:30 PM »
Dear Users!

I would like to ask for Your help. I have a Canon 7D Mk I (the old version). I have never shooted a video before on it, but this time I would need video.

I need to record 2 hour-long family psychotherapy sessions.
So I would like to record 2 hours long without stoping or without touching the camera.

Is this possible?
Will it not harm my camera?


Thanks a lot in advance!

Walter Schulz

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Re: 2 hour long video?
« Reply #1 on: May 20, 2015, 07:14:15 PM »
Sorry, that's not what DSLRs are made for.
Every dumb camcorder will do just fine.

If you insist doing so you have to use an external power supply (Canon AKG-E6 or else).
H.264 will interrupt (with some noise) after 29:59:59 continuous recording, shutter will close, mirror will come down and ML will restart recording. You will loose about 0.5 seconds (as far as I can tell). Data rate is about 6 MByte/s in 1080p -> 2 hours = 7200 seconds -> about 44 GByte.

Recording in RAW/MLV will do seamless but cause serious data streams. Do calculation:
7200 * Vertical resolution * horizontal resolution * 14 * frame rate / 8 = Bytes
Or other way round: Biggest card available has about 238 GByte. Will give you about 889x500 resolution.

And in both modes cam will heat up and - if limit is reached - will just stop recording. If it hits limit or not is unpredictable from here. Depends on your environment.

ijgabor

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Re: 2 hour long video?
« Reply #2 on: May 20, 2015, 08:45:51 PM »
Oh I see. Seems to be a bit complicated, probably I would use a regular camcoder than.
Thanks a lot for Your help! :)