28 May
2014
28 May
'14
7:58 a.m.
Am 27.05.2014 um 22:11 schrieb Gérald Maruccia:
something like Dolby Atmos probably makes use of
(almost) all available channels.
16 channels were initially intended by DCI to make enough room for future sounds
evolution (and probably other datas object-oriented in case of Atmos)
Atmos uses a very different approach, they only include a sync track (DCI channel 14). The
ATMOS audio itself comes as a separate MXF file which is not even covered by current
DCI/SMPTE.
So far the maximum channel count in a regular DCP would be something like a 7.1 mix + 2
HI/VI tracks + maybe a DBOX seat track, so, like 12ch max.
Auro 3D has it's additional height channels hidden in the LSBs of a conventional 24Bit
5.1 audio mix.
BTW - SMPTE DCPs/KDMs now have options to disable audio watermarking in the media block
for specific track numbers that contain 'data type audio', like the ATMOS sync
tracks. The watermarking could otherwise render these tracks useless.
There was a discussion on 96KHz audio in DCPs on the ISDCF mailing list recently. It seems
it has never been used so far, quite a few servers/processors actually can not deal with
it it seems. A lot of servers seem to default to subsampling 96KHz tracks to 48KHz for
output.
- Carsten