Need Help: BMPCC (Original) - Get full resolution from DNG

[Kharak]

I know this is ML forum, but you guys normally know stuff about EXIF and Metadata and the BM Forum is really hard to get answers on anything that isn't the newest new new.

I bought the BMPCC (BlackMagic Pocket Cinema Camera) original or first edition what have you, the not-4K one. In package, never used at my local photo store for a good price and it shoots RAW, so I of course had to have it. And I've really been interested in the Super 16 look of lately and B4 Zooms and so on, so its a nice package.

I noticed that when playing the DNG's in MLRawViewer (which somehow works with Compressed DNG's from BM cameras) that the camera actually shoots 1952x1112 and not 1920x1080 as shown in Resolve and other software- Not a big Crop, but none the less a crop on an already heavily cropped camera. The DNG's contain metadata that tell the software, like Resolve to Crop to 1920x1080. See Exif. I don't know why, maybe for easier calculations or just to adhere to a standard, but I see no artifacts with the extra resolution.
I opened a DNG in Rawdigger Trial version and I have no idea what I am doing or if this is the right tool. But got the exif data. What I need help with, is a way to change or remove the crop, preferably on all the DNG's, like Batch uncrop if possibe or Change Metadata of all DNG's on the SD card.

So if someone could point me at the right tool or Command, I would be very happy.

Just some extra info, in my test I found out that the camera LCD shows the cropped 1920x1080 area and not the full 1952x1112 recorded resolution.

---- ExifTool ---- ExifTool Version Number      : 12.36 ---- File ---- File Name                    : super16 raw_1_2022-02-10_1144_C0020_000000.dng Directory                    : I:/super16 raw_1_2022-02-10_1144_C0020 File Size                    : 2020 KiB File Modification Date/Time  : 2022:02:10 10:44:55+00:00 File Access Date/Time        : 2022:02:10 10:44:54+00:00 File Creation Date/Time      : 2022:02:10 10:44:55+00:00 File Permissions             : -rw-rw-rw- File Type                    : DNG File Type Extension          : dng MIME Type                    : image/x-adobe-dng Exif Byte Order              : Big-endian (Motorola, MM) ---- EXIF ---- Subfile Type                 : Full-resolution image Image Width                  : 1952 Image Height                 : 1112 Bits Per Sample              : 12 Compression                  : JPEG Photometric Interpretation   : Color Filter Array Orientation                  : Horizontal (normal) Samples Per Pixel            : 1 Planar Configuration         : Chunky Tile Width                   : 976 Tile Length                  : 1112 Tile Offsets                 : 9216 1084480 Tile Byte Counts             : 1075262 984166 CFA Repeat Pattern Dim       : 2 2 CFA Pattern 2                : 1 2 0 1 TIFF-EP Standard ID          : 0 0 0 1 DNG Version                  : 1.2.0.0 Unique Camera Model          : Blackmagic Pocket Cinema Camera Linearization Table          : (Binary data 20799 bytes, use -b option to extract) Black Level Repeat Dim       : 1 1 Black Level                  : 256 White Level                  : 51080 Default Crop Origin          : 16 16 Default Crop Size            : 1920 1080 Color Matrix 1               : 1.31197 -0.49679 0.01156 -0.41723 1.44237 0.04528 0.06723 0.2171 0.72651 Color Matrix 2               : 1.00885 -0.27351 -0.08258 -0.48997 1.34441 0.11174 -0.06406 0.32997 0.53917 Camera Calibration 1         : 1 0 0 0 1 0 0 0 1 Camera Calibration 2         : 1 0 0 0 1 0 0 0 1 As Shot Neutral              : 0.6306 1 0.7728 Baseline Exposure            : 2.1 Camera Serial Number         : BC5D3219599F4337BFA39329B572099A Calibration Illuminant 1     : Standard Light A Calibration Illuminant 2     : D65 Time Codes                   : 11:44:55.00 Frame Rate                   : 24 ---- Composite ---- CFA Pattern                  : [Green,Blue][Red,Green] Image Size                   : 1952x1112 Megapixels                   : 2.2

[Kharak]

I forgot, if you want sample DNG's I will WeTransfer to you in PM.

So I found ExiftoolGUI https://exiftool.org/forum/index.php?topic=2750.0 I actually thought this was ML forum 

But I can't figure out how to use it, maybe I should join that forum..

[Deadcode]

The crop factor of 2.88x is calculated with the 1920x1080 resolution, however the difference is barely 2%.

[Kharak]

Yes, but the extra vertical resolution is proportionally higher than its corresponding horizontal resolution. So if you set up a 16x9 Project and you have the full sensor width resolution (1952) you gain extra Vertical wiggle room for stabilization. Something I have been a profound user of with 5D3's 3:2 1920x1280 resolution. When tracking headshots and you want that headline to stay close to the top border, it is an amazing tool for controlling your compositions or for post stabilization.

After playing with different Exiftool GUI's, I think I need to get a command for Exiftool(-k) and somehow remove DefaultCropSize. The GUI ones don't seem to be able to do that, even tried removing all Metadata and that did not remove anything.

[Danne]

Provide a dng example in your post. Better than sending privately.
You need to find syntax using exiftool. If you get it to work with exiv2 it´s even faster to change.
Here is one example using exiftool changing the as shot neutral tag:

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exiftool "-AsShotNeutral=0.4757272085 1 0.6440925123" M20-1539_frame_1.dng -overwrite_original

[ArcziPL]

The GUI ones don't seem to be able to do that

Select a file
Click on "Exif" button on the right panel
Find and right click "Default Crop Origin" field and select "Add tag to workspace"
Do the same for "Default Crop Size"
Click on "Workspace" button on the right panel
Select "Default Crop Origin", change the value in the edit field on the very bottom to 0 0, press Enter, click "Save" button
Select "Default Crop Size", change the value in the edit field to 1952 1112, press Enter, click "Save" button

Your DNG should be modified now.

For batch processing you should use the command line option of exiftool

[Kharak]

Thank you all for looking in to this.

I had some issues with my cloud yesterday, here they are: https://drive.protonmail.com/urls/W1XSGHAEVC#Wn4Gtp4spxRD
Its 12 frames cut out, you can look at the printed dots in the notepad and see the crop/uncrop.

I will try your suggestions now.

EDIT:

@ArcziPL The GUI does not work, the Save button remains greyed out. Is the metadata locked somehow? is that possible?

@Danne I tried using that Exiftool command, but replacing with "-defaultcropsize" instead, but I probably need something else to -overwrite_original with.. I am so dumb with this stuff.

[Levas]

Not an expert with exiftool, but learned some useful commands on this forum 

The command line you're looking for is:

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exiftool -IFD0:DefaultCropSize="1952 1112" *.dng

Use this command, while being located in the directory were the dng files are.

The above command keeps the originals, doesn't overwrite stuff.

If all works well, and you want to overwrite originals:

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  exiftool -IFD0:DefaultCropSize="1952 1112" -overwrite_original *.dng

Not sure why the IFD0 part has to be used, but it is common, some standard layer naming in exifs or something 

[Kharak]

That did the trick, you're an expert to me! Thank you.

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exiftool -IFD0:DefaultCropSize="1952 1112" *.dng

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exiftool -IFD0:DefaultCropOrigin="0 0" *.dng

I put the command in ExiftoolGUI and it changed the Metadata of all the DNG's in the folder. I had to also change DefaultCropOrigin to 0 0 to make the DNG's viewable in Windows Photo Viewer and Photos and probably other software.

And thanks to everyone else for helping out!

[snappy8k]

I made a simple tool to batch convert BMPCC OG footage from 1920x1080 to 1952x1112. The script goes through all folders and sets the highest resolution. Even with some stabilization, I get a wider field of view than the original 1080p.

GitHub repo: https://github.com/Eloren1/bmpcc-og-full-res

[snappy8k]

EDIT: MacOS version is now live too!

- Windows version: https://github.com/Eloren1/bmpcc-og-full-res#windows-installation
- MacOS version: https://github.com/Eloren1/bmpcc-og-full-res#macos-installation

[Kharak]

Thank you for fixing the link.

I look forward to testing this script, because even though the other method posted here is "batch" editing. It is still a very tedious method of selecting one folder at a time, waiting for the process to finish and repeat.

Thank you for your contribution.

[names_are_hard]

It's not tedious if you're on a unix-ish system:

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find . -name "*.dng" | xargs exiftool -IFD0:DefaultCropSize="1952 1112"

Recursively runs the exiftool command on all *.dng files starting in whatever dir you run it in.  I did not actually test it, so you should do that in a less broad way first.

[Walter Schulz]

Crude command line for Windows:

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For /R %a in (*.dng) do exiftool -IFD0:DefaultCropSize="1952 1112" "%a"

Not tested! ;-)
EDIT: Missing quote added.

[names_are_hard]

Thanks, my windows cmd foo is mostly rusted away

It's got unbalanced quotes which looks suspicious.

[Kharak]

Running win 10. It does not work for me.

When the script runs it says

"Super 16 BMPCC_1_2023-06-19_1229_C0147: Setting resolution to 1952x1112px
Could not find C:\windows\exiftool_files\perl5*.dll"

Why is it looking for "C:\windows\exiftool_files\perl5*.dll". This folder does not exist in my win 10 machine, not sure if this is a win 11 thing.

I tried googling for "Missing perl5.dll", this is one answer to a forum post

It sounds to me that the thing you're describing as a 'perl script' is actually an executable built from a perl script using ActiveState's perlapp with the --dependent flag. By default, perlapp executables are self contained, but the perl{version number here}.dll can be left out to save space.

Possible courses of action (roughly in order of ease + sanity):

Get the original source from the guy who wrote it, & just run it.

Get the guy who wrote it to update the perlapp executable to a non-dependent version or a version that runs under your installed version of ActivePerl.

Pony up for ActiveState's 'business' subscription to download & install ActivePerl 5.8 (and no other version) on that machine.

Find a copy of the perl58.dll and place it where windows will find it. (may require subscription, or the guy who built the perlapp may have a copy lying about)

Extract the original script from within the .exe and either build a newer (and non-dependent) perlapp or just run it from the source as Larry intended.

Now the entire thing around perl58.dll script and what not is way over my head. I thought I could just download a .dll library, but it does not seem straight forward like that.

Any suggestions?

[Walter Schulz]

"Note that if you move the .exe to another folder, you must also move the "exiftool_files" folder to the same location."

Snappy's instructions doesn't cover this part of exiftool's requirements.

And working with software distribution tools for quite some time: Having 3rd-party executables copied to C:\Windows gives me the creeps.

[Kharak]

Cant believe I missed that. Found the exiftool files folder in the downloaded exiftool-k.exe zip file..

Thank you Walter. It works now.

So as Walter says, you have to move the "exiftool files" folder to Windows folder aswell.