2 Nov
2019
2 Nov
'19
7:07 p.m.
Hi Carl, hope all is well with you, I'm a user of your product DCP-o-matic
for two years now and I have to say that it's a very good DCP creator and
one of the best according to the reviews I've seen online. I use it to
create movie trailers for our cinema here in Barbados. Though I usually
receive links from our movie Distributors to download their DCP trailer
content for our screens, if there are any unavailable content I will go to
HDtrailers.net or Thedigitaltheater.com. and download the the content if
available. These trailers which I download from the two sites in the above
have to be prepped for DCP export which I use the DCP-o-matic DCP creator
to finish the trailer.
DCP file size: ( Distributors content file size vs DCP-o-matic file size.)
My observation of file size that the trailer content downloaded via link
from our Distributors have a greater file size than any trailer content
that I create using the DCP-o-matic creator.
I understand that the Distributor's content are mastered in Dolby 5.1 and
mixed in a facility studio with 5.1 audio track stems and full 2k video
content that is then exported to DCP with very expensive DCP creator
software like Easy DCP and Wraptor DCP. but the trailer content download
from Thedigitaltheater.com that are mastered in Dolby 5.1 are copies from
the good content and then converted to MKV and MP4 files that are smaller
in size because of the compression of audio and video bit rates.
If I convert one of these compressed trailer files to DCP using The
DCP-o-matic creator, then compare it to one of the Distributors files (the
exact trailer) there is always a difference in the size of the output file.
Mastering in Adobe Premiere Pro and Audition:
I've experimented with creating 2048x858 2K & 1998x1080 2K QuickTime video
files in Premiere with maximum bit rates and bit depths for optimum picture
quality, and have extracting the 5.1 files from the compressed content
with Audition then export to 5.1 wav files. Then I create and export a 5.1
2k sequence file that give me a 2.9gb or a 3.0gb file depending on the
length of the trailer.
DCP-o-matic export:
After I have imported the sequence file that I have created in Premiere
into DCP-o-matic and make all the necessary adjustments then I make the
DCP. After the DCP is finished, I am seeing that the file existing in the
content folder is half the size of the sequence file. Example! [ imported
sequence file = 3.0gb] [exported DCP folder with ASSETMAP, cpl, j2c, pcm,
pkl, VOLINDEX = 1.5gb.]
There is also a drop in resolutions in the exhibition of the trailer
content although all DCP contents are 2K.
(1) Is the compression rate set by default to 2gb alone for all contents
that are approximately 2 minutes 30 seconds?
(2) Or, is there something that I can do to maintain a maximum quality
content and keep my file size matching the imported file size? Thanks!
Best regards,
Clive.
3 Nov
3 Nov
7:50 p.m.
Hi Clive
Have you tried adjusting the control "JPEG2000 bandwidth for newly-encoded
data"
Kind regards,
Carl
On Sat, 2 Nov 2019, Clive Osbourne via DCPomatic wrote:
Hi Carl, hope all is well with you, I'm a user of
your product DCP-o-matic for two years now and I have to say that it's a very good DCP
creator and one of the best according to the reviews I've seen online. I use it to
create movie
trailers for our cinema here in Barbados. Though I usually receive links from our movie
Distributors to download their DCP trailer content for our screens, if there are any
unavailable content I will go to HDtrailers.net or
Thedigitaltheater.com. and download the the content if available. These trailers which I
download from the two sites in the above have to be prepped for DCP export which I use the
DCP-o-matic DCP creator to finish the trailer.
DCP file size: ( Distributors content file size vs DCP-o-matic file size.)
My observation of file size that the trailer content downloaded via link from our
Distributors have a greater file size than any trailer content that I create using the
DCP-o-matic creator.
I understand that the Distributor's content are mastered in Dolby 5.1 and mixed in a
facility studio with 5.1 audio track stems and full 2k video content that is then exported
to DCP with very expensive DCP creator software like Easy
DCP and Wraptor DCP. but the trailer content download from Thedigitaltheater.com that are
mastered in Dolby 5.1 are copies from the good content and then converted to MKV and MP4
files that are smaller in size because of the
compression of audio and video bit rates.
If I convert one of these compressed trailer files to DCP using The DCP-o-matic creator,
then compare it to one of the Distributors files (the exact trailer) there is always a
difference in the size of the output file.
Mastering in Adobe Premiere Pro and Audition:
I've experimented with creating 2048x858 2K & 1998x1080 2K QuickTime video files
in Premiere with maximum bit rates and bit depths for optimum picture quality, and have
extracting the 5.1 files from the compressed content with
Audition then export to 5.1 wav files. Then I create and export a 5.1 2k sequence file
that give me a 2.9gb or a 3.0gb file depending on the length of the trailer.
DCP-o-matic export:
After I have imported the sequence file that I have created in Premiere into DCP-o-matic
and make all the necessary adjustments then I make the DCP. After the DCP is finished, I
am seeing that the file existing in the content folder
is half the size of the sequence file. Example! [ imported sequence file = 3.0gb]
[exported DCP folder with ASSETMAP, cpl, j2c, pcm, pkl, VOLINDEX = 1.5gb.]
There is also a drop in resolutions in the exhibition of the trailer content although all
DCP contents are 2K.
(1) Is the compression rate set by default to 2gb alone for all contents that are
approximately 2 minutes 30 seconds?
(2) Or, is there something that I can do to maintain a maximum quality content and keep
my file size matching the imported file size? Thanks!
Best regards,
Clive.
4 Nov
4 Nov
11:36 a.m.
Yes, I did Carl thank you, after I sent you the email I was going through
the default settings and doing some more research on the JPEG2000 bandwidth
settings. Then I realized I was not making any adjustment to the JPEG2000
bandwidth for newly-encoded
data", thanks a lot Carl. All is good now, I made the adjustment for a
new trailer I'm working on "THE COURIER" and every thing turned out ok.
I'm
getting a 2.46gb DCP now from the QuickTime file of 2.75gb, instead of the
1.68gb I got before.
Keep up the good work and best wishes to you and the team.
My best regards,
Clive.
On Sun, Nov 3, 2019 at 1:50 PM Carl Hetherington <cth(a)carlh.net> wrote:
Hi Clive
Have you tried adjusting the control "JPEG2000 bandwidth for newly-encoded
data"
Kind regards,
Carl
On Sat, 2 Nov 2019, Clive Osbourne via DCPomatic wrote:
Hi Carl, hope all is well with you, I'm a
user of your product
DCP-o-matic for two years now and I have to say that it's
a very good DCP
creator and one of the best according to the reviews I've seen online. I
use it to create movie
trailers for our cinema here in Barbados. Though
I usually receive links
from our movie Distributors to download their DCP trailer
content for our
screens, if there are any unavailable content I will go to HDtrailers.net or
Thedigitaltheater.com. and download the the
content if available. These
trailers which I download from the two sites in the
above have to be
prepped for DCP export which I use the DCP-o-matic DCP creator to finish
the trailer.
DCP file size: ( Distributors content file size vs DCP-o-matic file
size.)
My observation of file size that the trailer
content downloaded via link
from our Distributors have a greater file size than any
trailer content
that I create using the DCP-o-matic creator.
I understand that the Distributor's content are mastered in Dolby 5.1
and
mixed in a facility studio with 5.1 audio track stems and full 2k video
content that is then exported to DCP with very expensive DCP creator
software like Easy
DCP and Wraptor DCP. but the trailer content
download from
Thedigitaltheater.com that are mastered in Dolby 5.1 are copies from
the
good content and then converted to MKV and MP4 files that are smaller in
size because of the
compression of audio and video bit rates.
If I convert one of these compressed trailer files to DCP using The
DCP-o-matic
creator, then compare it to one of the Distributors files (the
exact trailer) there is always a difference in the size of the output file.
Mastering in Adobe Premiere Pro and Audition:
I've experimented with creating 2048x858 2K & 1998x1080 2K QuickTime
video
files in Premiere with maximum bit rates and bit depths for optimum
picture quality, and have extracting the 5.1 files from the compressed
content with
Audition then export to 5.1 wav files. Then I
create and export a 5.1 2k
sequence file that give me a 2.9gb or a 3.0gb file
depending on the length
of the trailer.
DCP-o-matic export:
After I have imported the sequence file that I have created in Premiere
into
DCP-o-matic and make all the necessary adjustments then I make the
DCP. After the DCP is finished, I am seeing that the file existing in the
content folder
is half the size of the sequence file. Example! [
imported sequence file
= 3.0gb] [exported DCP folder with ASSETMAP, cpl, j2c, pcm,
pkl, VOLINDEX
= 1.5gb.]
There is also a drop in resolutions in the
exhibition of the trailer
content although all DCP contents are 2K.
(1) Is the compression rate set by default to 2gb alone for all contents
that are
approximately 2 minutes 30 seconds?
(2) Or, is there something that I can do to maintain a maximum quality
content
and keep my file size matching the imported file size? Thanks!
>
> Best regards,
>
> Clive.
>
>
>
>
>
>
>
> 
11:54 a.m.
A careful reminder: We just experienced issues playing back a DCP on classic Doremi
servers (DCP-2000/DCP-2k4, using Dolphin boards). They are known to be picky if the j2k
data rate approaches the DCI spec limit of 250MBit/s. Yesterday I experienced playback
issues on a DCP-2k4 at a data rate of 230MBit/s. The same DCP had no issues on a Sony 515
and Barco server. I checked the DCP, unwrapping the individual J2K images, and confirmed
that very many frames hit exactly the 230MBit/s spec (about 1178kByte per frame). There
was not a single frame peaking beyond that data rate. Yet that Doremi showed false colors,
green flashes, and audio sync issues in certain parts of the movie. Techwise, the DCP was
perfectly okay.
I can only advise, if your DCP goes wide and you can not control the type of system it is
played on, restrict yourself to around 200MBit/s to be on the safe side. Believe me, you
can not see the difference between 200 and 250 MBit/s even on a big screen. J2K has a huge
safety margin before visual image degradation occurs.
Most (even very big budget) mainstream DCPs stay well below 200MBit/s.
The same data rate limits apply for 4k and 3D releases. You don't double or quadruple
the data rate for 4k or 3D!
Regards - Carsten
Am 04.11.2019 um 12:36 schrieb Clive Osbourne via DCPomatic:
Yes, I did Carl thank you, after I sent you the email
I was going through the default settings and doing some more research on the JPEG2000
bandwidth settings. Then I realized I was not making any adjustment to the JPEG2000
bandwidth for newly-encoded
data", thanks a lot Carl. All is good now, I made the adjustment for a new
trailer I'm working on "THE COURIER" and every thing turned out ok. I'm
getting a 2.46gb DCP now from the QuickTime file of 2.75gb, instead of the 1.68gb I got
before.
Keep up the good work and best wishes to you and the team.
My best regards,
Clive.
On Sun, Nov 3, 2019 at 1:50 PM Carl Hetherington <cth(a)carlh.net> wrote:
Hi Clive
Have you tried adjusting the control "JPEG2000 bandwidth for newly-encoded
data"
Kind regards,
Carl
On Sat, 2 Nov 2019, Clive Osbourne via DCPomatic wrote:
Hi Carl, hope all is well with you, I'm a
user of your product DCP-o-matic for two years now and I have to say that it's a very
good DCP creator and one of the best according to the reviews I've seen online. I use
it to create movie
trailers for our cinema here in Barbados. Though I usually receive links from our movie
Distributors to download their DCP trailer content for our screens, if there are any
unavailable content I will go to HDtrailers.net or
Thedigitaltheater.com. and download the the content if available. These trailers which I
download from the two sites in the above have to be prepped for DCP export which I use the
DCP-o-matic DCP creator to finish the trailer.
DCP file size: ( Distributors content file size vs DCP-o-matic file size.)
My observation of file size that the trailer content downloaded via link from our
Distributors have a greater file size than any trailer content that I create using the
DCP-o-matic creator.
I understand that the Distributor's content are mastered in Dolby 5.1 and mixed in a
facility studio with 5.1 audio track stems and full 2k video content that is then exported
to DCP with very expensive DCP creator software like Easy
DCP and Wraptor DCP. but the trailer content download from Thedigitaltheater.com that are
mastered in Dolby 5.1 are copies from the good content and then converted to MKV and MP4
files that are smaller in size because of the
compression of audio and video bit rates.
If I convert one of these compressed trailer files to DCP using The DCP-o-matic creator,
then compare it to one of the Distributors files (the exact trailer) there is always a
difference in the size of the output file.
Mastering in Adobe Premiere Pro and Audition:
I've experimented with creating 2048x858 2K & 1998x1080 2K QuickTime video files
in Premiere with maximum bit rates and bit depths for optimum picture quality, and have
extracting the 5.1 files from the compressed content with
Audition then export to 5.1 wav files. Then I create and export a 5.1 2k sequence file
that give me a 2.9gb or a 3.0gb file depending on the length of the trailer.
DCP-o-matic export:
After I have imported the sequence file that I have created in Premiere into DCP-o-matic
and make all the necessary adjustments then I make the DCP. After the DCP is finished, I
am seeing that the file existing in the content folder
is half the size of the sequence file. Example! [ imported sequence file = 3.0gb]
[exported DCP folder with ASSETMAP, cpl, j2c, pcm, pkl, VOLINDEX = 1.5gb.]
There is also a drop in resolutions in the exhibition of the trailer content although all
DCP contents are 2K.
(1) Is the compression rate set by default to 2gb alone for all contents that are
approximately 2 minutes 30 seconds?
(2) Or, is there something that I can do to maintain a maximum quality content and keep
my file size matching the imported file size? Thanks!
Best regards,
Clive.
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3 comments
3 participants
participants (3)
-
Carl Hetherington -
Carsten Kurz -
Clive Osbourne