Digital Cinema Package

[Avi Liani]

Avi, maybe you want to start with Chris Perry's basic and excellent tutorial (http://bitfilms.blogspot.com/2010/11...en-source.html).

Also, there are a number of open source toolsets related to digital cinema so you'd need to be way more specific to allow anyone to help here.

Which tools? What are you trying to do? What are you actually doing?

Hi

I am following these steps:

http://www.stereofinland.com/?page_id=49

[Wolfgang Woehl]

I pushed some code to collect and check X.509 certificates for Digital Cinema/SMPTE compliance upstream. Checks are following DCI_CTP_v1_1.pdf, chapter 2. See dc_crypto_context.rb.

These certificates, as you know, are used to sign DCPs and KDMs (See make-dc-certificate-chain.rb for PoC code to generate some of those certificates and Cinemaslides to actually use them.)

[jonathanj]

need a little help.

I am trying to learn making DCP with open source.

So I downloaded all open source tools. and I have uncompressed tif sequence, but when I run convert to DCP. bat file or image_j2k bat file, I get that it does not recognizes file type.

What may be the result?

Hi

I am following these steps:

http://www.stereofinland.com/?page_id=49

If you get "unregonized filetypes" error when trying to encode from tiff to j2c, it might be because your tiff image isn't in a correct resolution or bitdepth.
Can you provide some more information regarding your files... Are they 1998x1080, 2048x858, 2048x1080 or 1920x1080?
Or maybe provide which exact error you get. Screenshots or copy/paste of the error.

[Bert Jickty]

I have problem at ppm to tiff conversion stage

FOR /F %%i IN ('dir /B "%DIRNAME%\processing\01-pics\left\*.ppm"') DO  %IMDIRNAME%\convert "%DIRNAME%\processing\01-pics\left\%%i" -type  truecolor  -alpha Off  -depth 12  -gamma 0.454545 -recolor "0.4124564  0.3575761 0.1804375 0.2126729 0.7151522 0.0721750 0.0193339 0.1191920  0.9503041" -gamma 2.6  "%DIRNAME%\processing\02-transformed\left\%%i.tif"

More close to black, brightness changes stepwise.

On upper half - original picture, in lower half - after conversion by ImageMagick:


What is it the?

[Wolfgang Woehl]

Bert, can you post an original ppm and your tiff result so we can try to reproduce?

[Bert Jickty]

I have put files here: http://turbobit.net/mxegs5m6p8rp.html

[Wolfgang Woehl]

Bert, well, I can't reproduce (IM 6.5.7-8 here) what you're getting. The IM line you're using is fine. Also, although the linearization part is of the often used approximating type instead of the costlier correct type it wouldn't crush low values that much. Don't know, maybe your IM version is nasty. I'm sure over at ImageMagick Users someone might be able to pinpoint it.

[Bert Jickty]

Thanks, Wolfgang! The brother a wolf was right - upgrade to last version ( 6.6.9-5) has helped. People, don't use version 6.5.9-2 of ImageMagick.
And what the "correct type of the linearization part" must be?

[Wolfgang Woehl]

Bert, see http://en.wikipedia.org/wiki/SRGB#Th...transformation for the reasoning behind the math. In short gamma encoded sRGB carries a small linear range (values <= 0.04045 [0,1]) and a powered range (values > 0.04045, powered by 2.4). The resulting slope can be approximated with a 1/2.2 slope but this will crush low end values.

ImageMagick will do the right thing when called with "-colorspace sRGB".

[Michael Cinquin]

hello

I've built a new (beta, untested) smpte and interop xml subtitles generation tool, from the text generators found inside a Final Cut Pro timeline.
http://www.michaelcinquin.com/tools/...DCP_subtitling
I would appreciate field feedback.

cheers