Search found 1888 matches

by Carsten
Thu Dec 02, 2021 2:39 am
Forum: DCP-o-matic
Topic: File Formats
Replies: 1
Views: 102

Re: File Formats

We had occasional issues with some of the higher profile codecs some time ago, but I think they are solved. ProRes4444 shows a similar quality/data rate relation as DCP/J2K.
by Carsten
Tue Nov 30, 2021 12:57 pm
Forum: DCP-o-matic
Topic: Black screen on Doremi servers
Replies: 12
Views: 437

Re: Black screen on Doremi servers

Yup, comparing the MXFs directly would probably not give useful results. I remember when I found that J2K optimisation bug a few years ago, I unpacked the J2K MXF into individual J2K images and compared those. They were identical between two runs with the same compression rate (and build). As this t...
by Carsten
Mon Nov 29, 2021 11:47 pm
Forum: DCP-o-matic
Topic: Atmos track best practices
Replies: 11
Views: 400

Re: Atmos track best practices

ATMOS is now just a proprietary Dolby brand for SMPTE standardised IAB bitstreams. Not saying that IAB audio support could be implemented easily in DCP-o-matic, but proper file handling could at least be possible, as that is part of SMPTE DCP/aux data. Carl, have you ever seen an ATMOS DCP? There ar...
by Carsten
Mon Nov 29, 2021 11:27 pm
Forum: DCP-o-matic
Topic: Black screen on Doremi servers
Replies: 12
Views: 437

Re: Black screen on Doremi servers

Although you mentioned 200MBit/s, it could be a data rate problem. Doremis tend to show such issues. Usually they are repeatable. I have experienced something similar, but, admittedly, with a data rate of 230MBit/s. I lowered it to 200MBit/s, and the problem went away. Did I understand correctly, th...
by Carsten
Thu Nov 25, 2021 8:27 pm
Forum: DCP-o-matic
Topic: DCP AUDIO LEVEL
Replies: 15
Views: 9516

Re: DCP AUDIO LEVEL

No. Peak is only an issue if you actually hit 0dB True Peak. Peak and True Peak are strict technical problem indicators - when you hit 0dB, signal may clip and distort. RMS/LEQ/LUFS on the other side are perceptual warning indicators. If these are too high, audio may be considered too loud, but it i...
by Carsten
Wed Nov 24, 2021 11:16 pm
Forum: DCP-o-matic
Topic: Creating a OV from a VF
Replies: 1
Views: 137

Re: Creating a OV from a VF

Yes. You load a VF, assign it's OV (rightclick VF, 'Add OV'), and simply create a new DCP. This will copy all assets into a new DCP and create a standalone CPL and other metadata files. DCP-o-matic will not set the new DCPs parameter identical to those of the loaded VF/OV automatically. You need to ...
by Carsten
Wed Nov 24, 2021 2:33 pm
Forum: DCP-o-matic
Topic: Apply video filter on J2K
Replies: 1
Views: 116

Re: Apply video filter on J2K

Hmm, looks as if that is true. Most people will use J2K or DCPs explicitly for passtrough without recompression, so, any changes to image, incl. filters, would force recompression. That said - maybe video filters could be enabled for J2K content if recompression is ticked. I understand that for 'wei...
by Carsten
Sat Nov 20, 2021 5:52 pm
Forum: DCP-o-matic
Topic: Edit Rate vs Frame Rate in CPL Reel list
Replies: 5
Views: 306

Re: Edit Rate vs Frame Rate in CPL Reel list

Certainly a problem on festivals where you will usually receive content with a huge range of frame rates. For most cinematic DCPs, 24fps is the dominant frame rate. Rarely we do see 25 in germany.
by Carsten
Sat Nov 20, 2021 2:57 pm
Forum: DCP-o-matic
Topic: 3D source designation
Replies: 0
Views: 111

3D source designation

Hi Carl, when I load a 3D mxf from a DCP, what is the difference between '3D' and '3D alternate'? Can I assume both to be the same for frame sequential 3D source files? I notice that when I load the 3D MXF, I have to assign 3D or 3D alternate manually. When I load a 3D DCP, it is automtically set to...
by Carsten
Sat Nov 20, 2021 2:39 pm
Forum: DCP-o-matic
Topic: Edit Rate vs Frame Rate in CPL Reel list
Replies: 5
Views: 306

Re: Edit Rate vs Frame Rate in CPL Reel list

The frame rate and edit rate relation is usually 2 for 3D DCPs, as stereographic 3D video assets are frame-sequential, so 2 frames=1 edit rate unit. I haven't looked at NEODCP for a while, but as it reads out frame rate, shouldn't it be able to set the proper output frame rate automatically then? I ...