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December 09, 2019, 01:21:15 AM


Author Topic: Video recording stops after 12 mins?  (Read 5636 times)

Offline Toby123

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Video recording stops after 12 mins?
« on: June 11, 2015, 12:17:14 PM »
I'm a bit of a novice to the 550d. When I'm recording, the recording shuts down after 12-minutes. This happens each time I try to do a lengthy recording, even on a fast 32GB card, and irrespective of how much space I have left on the card.

Is there any way to prevent this?

Answers would be appreciated. Thanks.

Offline AndyCivil

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Re: Video recording stops after 12 mins?
« Reply #1 on: June 11, 2015, 01:06:42 PM »
No, not specifically. The problem is the FAT32 file system used on the card. Each file has its length stored as a 32-bit number. If you work it out, that comes to about 4GB. What you're experiencing is that after about 10 ~ 12 minutes, the movie has grown to the maximum size, so the camera has to stop.

The homebrew software "Magic Lantern" has a couple of tricks that can get around the problem: one is that you can manage the bit rate, so by decreasing the quality, you can squeeze a longer recording into 4GB, the other is that there's a mode where you can close one file and start another without losing any frames; this doesn't really solve the problem except that you can join the movies together afterward. I think some wedding photographers use this when they have an 'unattended' cam in the church and want to capture everything from one angle to blend in to a production movie later.


Offline Toby123

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Re: Video recording stops after 12 mins?
« Reply #2 on: June 11, 2015, 02:17:36 PM »
Thanks for the helpful reply, Andy.

So my next question is how do you set "the mode where you can close one file and start another without losing any frames"?

Having one continuous film in numerous segments would be fine. I'm planning to conduct a long interview (lasting over 1 hour) as a solo cameraman, but I don't want to stop and start the interview every 12 minutes to reset.

Advice on how to set this continuoius mode would be helpful.

Offline AndyCivil

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Re: Video recording stops after 12 mins?
« Reply #3 on: June 13, 2015, 02:02:28 PM »
I'm sorry, it seems I was mistaken about not losing any frames  :( Magic Lantern will restart, but not until the buffer is flushed. This is usually OK for wedding stuff, but it would suck for an interview. Apparently you lose 2 ~ 3 seconds.

Offline Craig

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Re: Video recording stops after 12 mins?
« Reply #4 on: June 14, 2015, 07:12:09 AM »
I'm sorry, it seems I was mistaken about not losing any frames .This is usually OK for wedding stuff

Not OK for wedding stuff (ceremony, speeches). The 6D doesn't lose any frames with it's original firmware.
6D, T2i, Canon 600EX, 430EXII, and some other stuff my wife doesn't know about.

Offline AndyCivil

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Re: Video recording stops after 12 mins?
« Reply #5 on: June 14, 2015, 11:15:58 AM »
I'm sorry, it seems I was mistaken about not losing any frames .This is usually OK for wedding stuff

Not OK for wedding stuff (ceremony, speeches). The 6D doesn't lose any frames with it's original firmware.

Fair enough. I suppose I was envisioning the situation where you're covering an event, and you'll be cutting from one close-up to another, but need an overall shot to fill in in-between, but yes, you could always argue that you need continuity, because you might need it. It wouldn't work for a twenty-minute speech, nor would it work for the OP's interview.