have not tested lossless myself, but I would think it offers mathematically accurate reconstruction of original at a very mild compression(probably 1.5-2:1).
as for computation, I believe that for this type of codec, required power depends more on the source resolution and picture content than compression level.
B.
From: Paul Dougherty <lists@postlit.com>
To: Avid-L2@yahoogroups.com; Bogdan Grigorescu <bogdan_grigorescu@yahoo.com>
Sent: Wednesday, July 6, 2016 6:00 AM
Subject: Re: [Avid-L2] jpeg2000 (aka j2k) standard on Avid MCn
Bogdan, this is brilliant, thank you so much. I'm not now on an Avid where I can test drive j2k (but will be soon). The last piece of the puzzle would be to understand how lossless j2k differs from the earlier (uncompressed) Avid 1:1? (esp re archiving)
By differs I mean pro/con. I'm guessing that the lossless version of j2k is not especially heavy computationally.
Thanks agaiin,
Paul
On Jul 5, 2016, at 10:43 PM, Bogdan Grigorescu bogdan_grigorescu@yahoo.com [Avid-L2] wrote:
j2k has a wide range of uses:-aquisition - all RED cameras use this type of compression, in the range of 3:1-20:1-distribution - all DCPs(digital cinema packages) are jpeg2000 compressed at 250Mbps-IMF(interoperable mastering format) and AS-02 packages for movie/broadcast versioning-high-end video over IP(Nevion/TVIPS)-archival-codec allows for different levels of quality, including lossless-resolution can be easily selected at the decoding end(i.e. same file can be decoded for both UHD and HD resolution)-compression is intraframe, so not very efficient when compared with MPEG-pretty heavy computationally - generally requires beefed up or dedicated HW(see RED Rocket)BG
From: "Paul Dougherty lists@postlit.com [Avid-L2]" <Avid-L2@yahoogroups.com>
To: Avid-L2@yahoogroups.com; Bogdan Grigorescu <bogdan_grigorescu@yahoo.com>
Sent: Tuesday, July 5, 2016 6:28 PM
Subject: Re: [Avid-L2] jpeg2000 (aka j2k) standard on Avid MCn
Thanks Bogdan, if this the only reason people use it? (archival purposes)The LoC site refers to "Lossless JPEG 2000 in Generic Container" is this the only way people use it?Thanks,PaulOn Jul 5, 2016, at 10:07 AM, Bogdan Grigorescu bogdan_grigorescu@yahoo.com [Avid-L2] wrote:iirc, it was specifically requested by one of the studios or networks - Disney or HBO - for archival purposesBG
From: "Paul Dougherty lists@postlit.com [Avid-L2]" <Avid-L2@yahoogroups.com>
To: Avid-L2@yahoogroups.com
Sent: Tuesday, July 5, 2016 5:28 AM
Subject: [Avid-L2] jpeg2000 (aka j2k) standard on Avid MCn
I'm trying to help a colleague with a fairly large archiving/digitizing project for a career's worth of NTSC work. The last time I posted about this someone mentioned capturing in jpeg2000.
Since (or when) jpeg2000 was introduced as a compression flavor in the Avid world (for both SD & HD)… what niche was it supposed to occupy or need was it supposed to fill?
Without having worked with it, I associate it with archiving and know it is promoted for that by the Library of Congress as there is a lossless version of it. Because it has jpeg in the name, one assumes it offers a compressed flavor, but that is as much as I know and I would like to learn more.
Thanks in advance for any help,
Paul
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