[7D RAW VIDEO]Faster speed, if picture quality is set to sJPEG

[_7D_]

Hi!

I hope this is the right place to ask this question. I already posted it into the "7D Raw Thread" - but somehow it got lost there ;-)

If I set the picture quality to sJPEG before shooting RAW video, I get about 75% more frames before the recording stopps automatically, compered to "RAW (no JPEG) setting. But what's the reason behind it?

Greets
_7D_

[_7D_]

Does nobody have an idea? ;-)

[ilguercio]

Because it gives you a bigger buffer, not faster speeds.

[_7D_]

Thanks! Is this a limitation developed by Canon, or made by ML-Developers?

[AnotherDave]

ML didn't make the buffer in the camera, so it's obviously an addition by Canon for when shooting sJPEGs...

Good find!

[1%]

Like on your pc, different programs use different amounts of memory. So sjpeg needs the least it appears. I'll look for some memory hacks, on 6D/5D3/M/600D there was a bit to gain from hacking about. On 50D not really so 7D is ?

[Andy600]

50D does seem to shoot for longer with sJpeg with recent builds. I'm sure it made no difference previously.

[Yuppa]

Unfortunately, useful info gets buried quickly here (and few seem willing to search much).  RE: 60D, this has been known for quite awhile (since May):

http://www.magiclantern.fm/forum/index.php?topic=5653.msg40488#msg40488

[a1ex]

The exact setting is camera-specific (e.g. 5D3 works best with raw, many others work best with some jpeg).

[_7D_]

Thanks for the answers. Yeah - I read about the "shoot_malloc" thing. But I still don't get the reason behind it. Shouldn't the buffer be as big as possible in every possible situation? Why is there a "software-limit", depending on the picture quality? If this is also present in standard photo mode - burst mode with RAW would definitly profit by a bigger buffer, or do I think in the wrong way? I see, there's a hardware limit. I would compare it to RAM. But how is it possible, that the limit is set down in some modes - like in RAW instead of JPEG?

I apologize for my bad english. But I hope you can see, that I'm not just lazy to google the solution. I just want to understand, why it is like this. I'm really interested in the "How is the whole ML system working, what are the software/hardware limits etc."

Greets

[1%]

so you're thinking like I'm playing COD, why can't I render out of AE at the same time. Shouldn't the memory be free in all situations. it works fine when I'm playing solitaire, etc.

[Yuppa]

The answer you seek to, "Why does the buffer do this and not this?" lies with Canon, so: