Film-Tech Forum ARCHIVE: Converting a Blu-ray (or DVD) to DCP

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Topic: Converting a Blu-ray (or DVD) to DCP

Chris Slycord
Film God

Posts: 2986
From: 청주시, 경북도, South Korea
Registered: Mar 2007

posted 11-27-2013 05:44 PM

The DCP-o-matic 32-bit deb package for Ubuntu 13.10 has an incorrect dependency.

It depends on "libxmlsec1 (>= 1.2.18-2)" so once I installed that, the package installed.

But running dcpomatic results in...
"dcpomatic: error while loading shared libraries: libxmlsec1-openssl.so.1: cannot open shared object file: No such file or directory"

So that tells you it actually depends on the "libxmlsec1-openssl" package.

And installing that package allows it to run.

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Alan Gouger
Jedi Master Film Handler

Posts: 501
From: Bradenton, FL, USA
Registered: Jul 2000

posted 11-27-2013 09:07 PM

Anyone else notice when playing back a ripped Blu-ray thats been converted to a DCP there is a gamma conversion taking place that is visually inaccurate. The playback appears to be a very low gamma 2.0 or even 1.9 using the DCI standard 2.6
I would expect the conversion to land a gamma somewhere between 2.2 and 2.6 but it is going the other direction. Setting up another memory or macro in your projector to counter this the BD looks great.

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Carl Hetherington
Film Handler

Posts: 93
From: York, North Yorkshire, England
Registered: Jul 2012

posted 11-28-2013 08:39 AM

quote: Chris Slycord
The DCP-o-matic 32-bit deb package for Ubuntu 13.10 has an incorrect dependency.

Thanks, I will fix that.

quote: Alan Gouger
Anyone else notice when playing back a ripped Blu-ray thats been converted to a DCP there is a gamma conversion taking place that is visually inaccurate. The playback appears to be a very low gamma 2.0 or even 1.9 using the DCI standard 2.6

This is with DCP-o-matic? What version? You mean that your conversion came out too bright?

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Alan Gouger
Jedi Master Film Handler

Posts: 501
From: Bradenton, FL, USA
Registered: Jul 2000

posted 11-28-2013 11:59 AM

Hello Carl I just checked and I used DVD-o-matic, version 0.126
it turned out to bright. Should I give DCP-o-matic a try.
I get the same results using Cineasset. The math may not taking into account the difference in source gamma before the conversion.

Thank you.

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Carsten Kurz
Film God

Posts: 4340
From: Cologne, NRW, Germany
Registered: Aug 2009

posted 11-29-2013 06:08 AM

I had the same issue with a BluRay Conversion with DVD-o-matic, I wrote Carl about it earlier. However, I have seen other conversions from other people without that issue. I still have not found the time to find out what causes this, machine/FFMPEG/OS, or the specific BluRay.

The gamma issue was not subtle - blacks were driven up to greenish blocky gray, blooming dark red, etc. That one DCP I was only able to play with a custom projector setting (reduced brightness a lot). No, it was not a missing xyz conversion, the colour balance was okay.

I need to spend some more time on this.

- Carsten

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William Kucharski
Expert Film Handler

Posts: 244
From: Louisville, Colorado, United States of America
Registered: Oct 2012

posted 12-02-2013 11:24 PM

I certainly hope that when you convert this way you let audiences know, if they ask.

I would feel severely ripped off if I were to see a film in a theater converted from DVD or BD, ick.

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Jordan Older
Film Handler

Posts: 7
From: Ventura, CA, USA
Registered: Oct 2013

posted 12-03-2013 09:01 PM

I'm converting a .mov file 1920x1080 into a DCP. The ratio is 1.78:1 so which format in DVD-o-Matic do I select? Also, does DVD-o-Matic accept .mov or do I need to convert it to mkv with HandBrake first?

I'm going to use 16:9 since it matches.

I'm still a little confused on the JPEG2000 bandwidth setting. What value do I enter to create the best quality DCP?

Thanks everyone!

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Carl Hetherington
Film Handler

Posts: 93
From: York, North Yorkshire, England
Registered: Jul 2012

posted 12-04-2013 03:21 AM

quote: Jordan Older
I'm converting a .mov file 1920x1080 into a DCP. The ratio is 1.78:1 so which format in DVD-o-Matic do I select? Also, does DVD-o-Matic accept .mov or do I need to convert it to mkv with HandBrake first?

DVD-o-matic will accept .mov. I would use "16:9 within Flat", though 16:9 will probably work fine.

quote: Jordan Older
I'm still a little confused on the JPEG2000 bandwidth setting. What value do I enter to create the best quality DCP?

Empirical evidence suggests that you won't notice any difference between 50 and 250MBps, so I would suggest 50Mbps.

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Mark Strube
Master Film Handler

Posts: 322
From: Milwaukee, WI, United States
Registered: Feb 2007

posted 12-05-2013 02:39 PM

I've noticed that when converting a DVD with a film source, I'm not able to get an inverse telecine. Is there any way to do this, or is this in the development plans?

Note that I'm talking about a DVD (29.97) that has progressive film frames within the video (23.976). The only way I've been able to convert these is to leave the output set at 30 fps, and it looks like there's just extra frames present, creating a bit of a choppy look.

I'm sure I could take the DVD's MKV file and convert to 23.976 in another piece of software beforehand, but that would be even more time-consuming and prone to quality loss.

Thanks for any ideas!

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Carsten Kurz
Film God

Posts: 4340
From: Cologne, NRW, Germany
Registered: Aug 2009

posted 12-05-2013 02:53 PM

Not currently. DVD-o-matic, however uses FFMPEG for image processing, and recent versions of FFMPEG offer inverse telecine, so, basically, it could be implemented I guess.

- Carsten

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Jordan Older
Film Handler

Posts: 7
From: Ventura, CA, USA
Registered: Oct 2013

posted 12-05-2013 04:10 PM

Why is 16:9 within flat better than just 16:9?

I've formatted a WD Passport 1TB USB hard drive ext3 and copied the DCP folder to the drive. Is the lost and found folder OK to keep on the drive? Is the DCP supposed to be inside a folder on the USB drive or in the root directory of the drive?

Is this how the folders should look? (image below)

http://venturait.com/wp-content/uploads/2013/12/dcp.png

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Mark Strube
Master Film Handler

Posts: 322
From: Milwaukee, WI, United States
Registered: Feb 2007

posted 12-06-2013 04:45 AM

Ideally the DCP folder that DVD-o-Matic creates (not the one you manually created) should be in the root directory of your hard drive. However, your server will probably find it either way... I'm sure this is dependent on your server brand and software version. Other extra folders and files shouldn't pose an issue, but again, I'd keep it simple if possible.

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Carsten Kurz
Film God

Posts: 4340
From: Cologne, NRW, Germany
Registered: Aug 2009

posted 12-06-2013 06:47 AM

quote: Jordan Older
Why is 16:9 within flat better than just 16:9?

Look at the target resolution/container created with the settings.

Stick to the commonly used DCI containers, in this case, 16:9 would create a 1920*1080 container (not to DCI spec), while 16:9 within flat would create a proper 1998*1080 flat container.

If this is only for your own server or the same server everytime, NTFS will probably do just as well, as most servers nowadays can read NTFS. If you're coming from a Windows system, this is easier and safer. Folders are no problem.

- Carsten

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Mark Strube
Master Film Handler

Posts: 322
From: Milwaukee, WI, United States
Registered: Feb 2007

posted 12-08-2013 05:21 AM

quote: Carsten Kurz
Not currently. DVD-o-matic, however uses FFMPEG for image processing, and recent versions of FFMPEG offer inverse telecine, so, basically, it could be implemented I guess.

Others may let me know if they disagree, but I think it would be very handy! The way I see it - the vast majority of DVD's out there are film speed based, it would be beneficial, especially on the big screen... if one MUST run a DVD source, it helps a lot for the motion to be smooth.

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Steve Guttag
We forgot the crackers Gromit!!!

Posts: 12814
From: Annapolis, MD
Registered: Dec 1999

posted 12-08-2013 10:58 AM

I absolutely agree. The DVD to DCP conversion I've personally seen was heavily marred by the lack of fluidity of motion since the DVD was at 29.97Hz from a 24fps source and was then converted to DCP at 30fps. Furthermore, I would think the file size and rendering time would drop by almost 25% since those frames would not need to be rendered.

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