5D Mark IV - "Press start/stop button to activate movie..."

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Chris Gagne

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5D Mark IV - "Press start/stop button to activate movie..."

PostSun Jul 09, 2017 8:06 pm

Hi Blackmagic folks!

I am planning to use a 5D Mark IV to record a ~2 hour lecture. I know there is a 30-minute internal recording limit, which is why I am interested in the BM Video Assist product.

The issue that I am running into is that after about 35 minutes outputting to HDMI in movie mode, the LCD screen goes black and displays "Press START STOP button to activate movie shooting." I've tried this twice, both times using a Canon 17-40 f/4 L lens.

This seems like it would preclude me from using the BM Video Assist product to record the HDMI stream for 2 hours...

Any advice or suggestions? Is there a way around this?
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Chris Gagne

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Re: 5D Mark IV - "Press start/stop button to activate movie.

PostMon Jul 10, 2017 5:26 pm

I learned that the way to get around this is to simply press a button on the camera every so often to keep it awake. Pressing "Rate" every 20 minutes seemed to do the trick.

Can anyone think of a way to do this that won't jostle the camera? some sort of external remote perhaps?
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Denny Smith

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Re: 5D Mark IV - "Press start/stop button to activate movie.

PostMon Jul 10, 2017 5:56 pm

The reason the Canon shuts down after 20-min, is it will overheat the sensor at or after 30 to 40 min., so a Canon DSLR (or most DSLRs) is not the camera to use to record a long event, like your 2-hr lecture. I tried this with a Nikon D7100, same issue, even forcing the camera bsckmin right after it shut down, resulted in it overheating a turning off 10-min. later. I would suggest getting a video camera to shoot your 2-hr lecture, youmwill get better results,
Denny Smith
SHA Productions
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Chris Gagne

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Re: 5D Mark IV - "Press start/stop button to activate movie.

PostMon Jul 10, 2017 9:32 pm

Thanks, Denny!

For what it's worth, I was able to keep it going for a couple of hours without it shutting down. But point taken: this might not work consistently or in a warm room, for instance.
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Xtreemtec

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Re: 5D Mark IV - "Press start/stop button to activate movie.

PostTue Jul 11, 2017 9:03 am

Indeed.. DSLR's are not for long recordings.. The sensor heats up very quickly and does not have the decent cooling to run it like that for hours..

You are reducing the lifetime of your DSLR quick in this way and you will notish that after a few times recording longer than recommended that pixels will fail.. (Dead pixels / hotpixels) Sending it in for repair under waranty will not go as planned.. The repair centers can read out the internal memory and they can see that you kept it in movie mode longer then recomended.. Also they can see temperature peaks.. So they will decide quickly that it is user error and you will be billed for the whole price of a sensor replacement.. ;)

So buy a cheap HD handycam and you will be better off..
Daniel Wittenaar .:: Xtreemtec Media Productions ::. -= www.xtreemtec.nl =-
4K OBV, ATEM TVS HD, Production Studio 4K, 2M/E Broadcast Studio 4K, Hyperdeck Studio, SONY FS7 4K, JVC HM700 Full HD Camera
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Colin Barrett

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Re: 5D Mark IV - "Press start/stop button to activate movie.

PostFri Jul 14, 2017 7:52 am

Xtreemtec wrote:So buy a cheap HD handycam and you will be better off..


You beat me to it. That's exactly what I'd recommend, too. People expect too much from D-SLRs.
Blackmagic Teranex 2D, Ultrastudio Express, Intensity Shuttle (Thunderbolt), H.264 Pro Recorder (all Mac OSX) & lots of old VTRs used for digital archiving of legacy video formats for major libraries, broadcasters, universities and public archives.

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