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Messages - cinemaxav

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Digital Cinema Packages / Re: Hash generation
« on: May 10, 2013, 09:58:48 AM »
Joop, thank you!
I've been struggling with openssl trying to get the right syntax and just couldn't do it.
That's great!
I only want to do it for the CPL file, so it's instant. It's a pain waiting for the normal tools to do it as they recalculate the hash for the MXF files when I don't need it (they haven't changed).

Digital Cinema Packages / Hash generation
« on: May 10, 2013, 05:19:33 AM »
I'm doing a lot of experimenting with subtitles on a DCP server.

If I change something in the CPL, I have to regenerate the PKL so that the hash of the CPL is updated.

Is there an easy way to do this? I can of course use the normal dcp tools, but each time, it goes to generate the sha1 digest of the video and audio assets which take time.

What I'd like to know is how to generate the correct type of hash used so that I can do it just on the modified CPL.

I thought the hashes were baset64 encodes, but I'm not so sure now.

Any pointers?

OpenDCP / Re: Formats for Subtitles.
« on: April 06, 2013, 01:15:57 PM »
Hi Cody,
Did you get any luck? Sorry, I just noticed your PM.

Thanks for the link, I hadn't found that before.
I'll have a read, edit some XML files and will report back with results when I get the time  :D

Digital Cinema Packages / Re: How can I demux MXF video ?
« on: March 28, 2013, 06:27:03 PM »
I was hoping to find an alternative to having to compile on Windows. Amberfin's / Snell & Wilcox's MXF Desktop applicaiton works for audio, but not video essences.
But after persevering a little, I've managed to build from source and looks like it's working. :)

Digital Cinema Packages / How can I demux MXF video ?
« on: March 28, 2013, 05:38:51 AM »
Simple question: I have some unencrypted DCP MXF files produced with OpenDCP I need to change and I've already deleted the JPEG2k source files.

How can I extract the jpeg files from the MXF file?

Thanks for the comprehensive reply, Wolfgang. It's clear to see how personal subtitles are, both to the producer and to the end viewer, and as we're both, we get to see both ends.

Strange you should mention Avatar as that's my candidate for the moment. I know the original DCPs for Avatar when it was released had them burnt in, partly because the SMPTE spec was still in its early days, partly because the "artistic direction of subtitles" forced them to use burnt in so guarantee getting the desired effect.

I know you might want to choose on a subtitle-by-subtitle level where they go, both in terms of X, Y and Z axis.

Do you have any examples of using the Zposition, VariableZ and LoadVariableZ parameters? I have access to the new Sony SRX-515 "Rocky" projector and initial testing with SMPTE subs on Avatar has prooved succesfull, if only the position needs working on.

I'm happy to experiment with it, understanding how it works and can give feedback on behaviour (at least on the R-515). I know we have a Doremi media block, but no projector head, so might have to limit my testing on the Sony one for now.

Thanks for your contribution, and feel free to get in touch if you want me to help you with your testing :)

After playing around and figuring out how to generate SMPTE timed text MXF subtitles and incorporate them into a DCP created with OpenDCP, it's all working great, even with custom fonts  :D

However, for 3D content, it places them in the "middle" of the depth, probably just behind the screen in my test case. This means subjects in the film are sometimes in front, sometimes behind, so it's quite distracting.

As the subtitles are just metadata and not burnt into the picture, is there a way of specifying the depth in the XML ? Unfortunately, I havne't been able to find the XML schema for the subtitles and the DCI spec doesn't seem to mention anything. I would have thought there's a field or metadata I can put in to specify the Z depth ?  ???

Any suggestions?

Digital Cinema Packages / Re: Converting 3D Blu-ray to 3D DCP
« on: March 23, 2013, 07:16:16 AM »
Thanks Loki, I have just found out what it is (had a problem in the past and it's left some php code in my files). I'll remove it shortly :)

Digital Cinema Packages / Re: Converting 3D Blu-ray to 3D DCP
« on: March 17, 2013, 02:17:15 PM »
An update: you can now decode the right eye using avisynth and the ssifSource2.dll. It's still a bit of a long method as you have to encode a h264 stream (I haven't found a way yet to go straight from MVC to frames), but it's a lot quicker and doesn't take up as much room, and you don't have to decode the left eye as well like ldecod does. Instead of using ldecod and obtaining full uncompressed YUV streams for both left and right eyes, you can do an x264 encode for the right eye only, chosing lossless compression. So there's no loss in quality, but it's a lot quicker. File sizes are around 50GB/hour of video. Speed is around half realtime on my quad core i5 system.

I'll update my blog when I have some time.

OpenDCP / Re: online dcp subtitling tool updated
« on: May 10, 2012, 06:17:02 AM »
Hi Michael, sent you an email.
P.S. Tu peux me répondre en français si tu préfères  ;)

Digital Cinema Packages / Re: Blu-ray to DCP
« on: May 09, 2012, 06:04:55 PM »
With ffmpeg, the parameters have to be typed before the input or output they reference.
So the -r24 is to specify the input is 24 fps.
I can't remember for sure, but I think you have to say it because with raw video, there's no frame rate information so ffmpeg wouldn't know how to extract it.

If it repeats one frame every 1000 frames, then this would cause a loss of sync with the audio: it would slowly drift out, then come back in every 1000 frames...

Next time I do a conversion, I'll play around with the stuff. I need to try some short form content - doing full features takes a long time to process just to check if you've got it right.

Digital Cinema Packages / Re: Blu-ray to DCP
« on: May 09, 2012, 07:10:35 AM »
Trust me, darklover, it works this way!
It is a bit confusing, and I think the true frame rate on blu-ray is 23.976 instead of 24.
As a result, when you extract the sound, it's slightly too long in duration which is why you need to then shorten it with eac3to so it matches the picture duration because the DCP has to be 24 fps.

Digital Cinema Packages / Re: Blu-ray to DCP
« on: May 08, 2012, 03:48:22 PM »
Thanks Terrence. Another example of Wikipedia giving an incomplete picture (pun intented!) I'll modify for the resolution stuff.

And yes, the no overwrite function does give you a kind of resume. I discovered that after writing that paragraph and forgot to update the text. It's in fact what prompted that other post regarding the fact you can't (currently ;)) start an encoding process if there are files still appearing in the directory, and where the start and end parameters don't help either...

I'll tweak. Thanks again  8)

Digital Cinema Packages / Re: Converting 3D Blu-ray to 3D DCP
« on: May 08, 2012, 01:02:07 PM »

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