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Re: DKDM / Safeguard config.xml :?:
Posted: Fri Jan 05, 2018 9:56 pm
by Guddu
I have used 2.11.34 in this case to generate my final DCP which will release in theatres on 11 Jan 2018
Re: DKDM / Safeguard config.xml :?:
Posted: Fri Jan 05, 2018 11:54 pm
by Carsten
I don't know wether you also encoded the DCP with 2.11.34, but at least, 2.11.34 got rid of a major J2C bug, so you may be lucky...
- Carsten
Re: DKDM / Safeguard config.xml :?:
Posted: Sat Jan 06, 2018 12:37 am
by Guddu
Cartsen,
Yes...I encoded using 2.11.34. The J2C bug you mentioned would cause what kind of problems? And at what stage would those manifest?
Will it play in DOM Player but crash on Cinema Projector or something like that?
Re: DKDM / Safeguard config.xml :?:
Posted: Sat Jan 06, 2018 2:57 am
by Carsten
Guddu wrote: ↑Sat Jan 06, 2018 12:37 am
Cartsen,
Yes...I encoded using 2.11.34. The J2C bug you mentioned would cause what kind of problems? And at what stage would those manifest?
Will it play in DOM Player but crash on Cinema Projector or something like that?
Yes, no problem in DOM player, but crash during play at least on Barco ICMP and Dolby Servers (quite a few of them around).
But as I said, this bug is confirmed to be solved in 2.11.34.
- Carsten
Re: DKDM / Safeguard config.xml :?:
Posted: Sat Jan 06, 2018 3:37 am
by Guddu
Carsten wrote: ↑Sat Jan 06, 2018 2:57 am
Guddu wrote: ↑Sat Jan 06, 2018 12:37 am
Cartsen,
Yes...I encoded using 2.11.34. The J2C bug you mentioned would cause what kind of problems? And at what stage would those manifest?
Will it play in DOM Player but crash on Cinema Projector or something like that?
Yes, no problem in DOM player, but crash during play at least on Barco ICMP and Dolby Servers (quite a few of them around).
But as I said, this bug is confirmed to be solved in 2.11.34.
- Carsten
Scary one though...The DCP I made was used at the censor board (they use Doremi IMB) and they had no issues so all should be fine. Until which version did we have that J2C bug? Also is it on mantis just to have a read? I have never seen or heard of a crash on a cinema projector in midst of a screening thus far. Have you?
Re: DKDM / Safeguard config.xml :?:
Posted: Sat Jan 06, 2018 12:25 pm
by Carsten
The first time to my knowledge we had a broken J2C. The J2C is using openjpeg library, and the openjpeg team recently added a small optimization that breaks the decoder of some servers.
Read it up here:
viewtopic.php?f=2&t=965
Testing it successfully on a Doremi and then failing in the field was our worst case scenario
In most cases, it would probably not have caused a crash mid-show, but simply prevented the show from starting, but in some cases, playback would start, then go into stutter-mode and stop.
That's why we advise not to use test versions for production work.
- Carsten