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Problem with recording both DNG and JPG photos

Joined
Apr 15, 2017
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Lake Lure, NC
Hello to all,

Today I was doing a test shoot at a property and after downloading the photos from the camera card, some of the JPGs were scrambled. The DNG versions were fine. And, it only occurred on some of the Panorama shots.

4K Video files recorded without problems.

I've shot several JPG+DNG panos in the past without troubles until this shooting. Any ideas?

Example:
Typhoon DNG.jpg
Typhoon JPG.jpg
 
I'm completely theorizing here, since I've not tried setting the H to shoot both formats...
which is saved first, the DNG? If so, and the write speed is not quite fast enough,
it might not have enough time in between the pre-progammed shots of the pano mode
to subsequently fully save the JPG version.

Do you have another microSD card you could try?
 
There seems to be a glitch in the firmware when using JPG+DNG. Use one or the other but not both until they get it fixed.
 
I sometimes shoot panos in both formats at the same time as well. Shooting stills is also done using both formats. The DNG file always stores first.

I too have had a few files that did not record properly but right now I don't recall which format it was.

Not certain but panos should prolly be only shot in one format. Regardless, if you shoot panos be sure to post process each photo before stitching.

I like Eagle's theory. It makes sense.
 
There seems to be a glitch in the firmware when using JPG+DNG. Use one or the other but not both until they get it fixed.
I recently started shooting my pictures using the DNG+JPG. Previously I did most pictures on JPG unless the client specified RAW. One thing I've noticed is that now the JPG files seem, overall, to be a smaller size while the DNG files come in at around 20Mb.
Other than the smaller sized JPG files I gotta say I've not had an issue with them.
 
JPG files are always considerably smaller files because the JPG format provides higher compression and discards a lot of high and low data. It's why JPG's are more limiting in post processing. The problem with JPG's is that we can't manipulate image data that isn't there. The same photo in DNG captures and retains the highs and lows, allowing post processing more range of adjustment.
 
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My understanding, from other camera systems, is that the DNG is the camera's raw (adobe's open version) file, and the JPG would be the "in camera" processed, then lossy compressed, file after applying the selected image mode (Natural, Gorgeous, etc.).

The only difference this time was that it was gustier than previous times I've used the pano function. That being said, I would think that the processors used to maintain position would not have any effect on photo processing.

Hmmm...After writing that last line I thought, the H could be using more power to maintain position, could that cause electrical fluctuations to effect the writing of the JPGs to the card? IE, the DNGs are written direct from the sensor with minimal processing, while the JPGs are both processed and then written...

I do have several different cards that I can try.

Thanks for the responses.
 
Fastest, highest data rate recording card works the best.

The photo format makes no difference with power consumption or in maintaining position. The corrupted file thing is a data buffering issue. Data coming in faster than the card can process it causes data to back up. If the processor lacks temporary storage capacity some of the backed up data gets lost. Everything has a limit, in this case ~50 mbps at the processor, and I think we come up against the processor's limit when our data cards choke the data stream.
 
OMG... what do you guys not understand? It's the write speed of the SD card. It has nothing to do with Raw (DNG) or Jpeg's. It's all about writing the data to disk, if you have a slow SD card then it will not write enough info before you take the proceeding shot! Get a faster SD card as recommended, any photospecialist's will tell you.
 
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OMG... what do you guys not understand? It's the write speed of the SD card. It has nothing to do with Raw (DNG) or Jpeg's. It's all about writing the data to disk, if you have a slow SD card then it will not write enough info before you take the proceeding shot! Get a faster SD card as recommended, any photospecialist's will tell you.

BrightonBlue

Pretty sure we covered write speed a few times already. I believe you were the first.
 
JPG files are always considerably smaller files because the JPG format provides higher compression and discards a lot of high and low data. It's why JPG's are more limiting in post processing. The problem with JPG's is that we can't manipulate image data that isn't there. The same photo in DNG captures and retains the highs and lows, allowing post processing more range of adjustment.
Hi Pat.
I understand about JPG compression and that JPG files will be considerably smaller than DNG files. What I was trying to say was that since I've been shooting in DNG + JPG that the JPG files now seem to be smaller than the JPG files captured when I was just shooting JPG alone...without DNG.

Also, and I I can't see why this would have an impact, I've noticed that since I switched the camera mode from JPG to JPG+DNG that the video I now capture is slightly sharper than it was before (I used to have to add a little sharpness in post but I now no longer need too). I've no idea how this could be since I would have thought that shooting in both JPG+DNG formats for stills would have no effect on video quality, but it's only been the case after I switched the JPG+DNG in. Can anyone suggest how this could be the case?
 
In theory, neither of those two actions should not have an effect on the other...
 
The above occurred with a SanDisk Extreme 64GB microSDXC UHS-I V30.
 
The above occurred with a SanDisk Extreme 64GB microSDXC UHS-I V30.

That is likely your answer... try a UHS-3 V30 microSD. IMHO, you will be better
off to get two 32GB cards than one 64GB.
 
That is likely your answer... try a UHS-3 V30. IMHO, you will be better off to get
two 32GB cards than one 64GB.

Will do, Thanks.

The info posted above was from the order. Here is the card in question. What does the 3 inside the U represent?
IMG_20170625_175527128_HDR.jpg
AF1QipMYu7yiBJrdOhg_y14gCquYznsUKPuxTAnIvvE
 
Last edited:
Hi Pat.
I understand about JPG compression and that JPG files will be considerably smaller than DNG files. What I was trying to say was that since I've been shooting in DNG + JPG that the JPG files now seem to be smaller than the JPG files captured when I was just shooting JPG alone...without DNG.

Also, and I I can't see why this would have an impact, I've noticed that since I switched the camera mode from JPG to JPG+DNG that the video I now capture is slightly sharper than it was before (I used to have to add a little sharpness in post but I now no longer need too). I've no idea how this could be since I would have thought that shooting in both JPG+DNG formats for stills would have no effect on video quality, but it's only been the case after I switched the JPG+DNG in. Can anyone suggest how this could be the case?

Interesting. I had not noticed a file size difference but I haven't looked at those lately. I will though.

The sharpness thing is, to say the least, odd. Are you using an after market lens that may have rotated slightly in the mount?
 
Actually the 3 inside the U indicates that this card is a UHS 3 card...
your next step up would be a V60 or V90 card
 
Where did you buy that card? If it was an online order, I'll bet you got a fake. I run a samsung U3 card in mine, shoot DNG+JPEG all the time and have never had any write speed issues.
 
Interesting. I had not noticed a file size difference but I haven't looked at those lately. I will though.

The sharpness thing is, to say the least, odd. Are you using an after market lens that may have rotated slightly in the mount?
Nope. Original lens.
Since my last update I'd had to add a bit of sharpening in post but only since I switched in DNG+JPG do I no longer need to add sharpening...the footage I'm getting now is the best quality I've ever seen from my H. Switching in the DNG+JPG is the only alteration I've done with the camera since the last update. I agree: It is odd that my footage has become a little sharper. I'm not aware of any way that switching in DNG+JPG would effect video sharpness. I'm baffled!

What's even more baffling is that since I switched in DNG+JPG I've not had a video drop-out when raising the legs but that's probably just a fortunate coincidence: the issue has always been intermittent so it wouldn't surprise me if it does drop out the next time I raise the landing gear.

(for full info, I shoot video in the 'natural' setting and the sunny/cloudy/florescent/etc. mode is dependent on the lighting conditions on the day)
 

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