Essence Offset start and ATMOS MXF ISSUE in some servers

[Jaume(Dolby)]

Hi Carl,

There is a functionality that is used un many *COMMERCIAL* DCPs:

Video, and specially PCM/ATMOS track comes from Facility with Academy Leader, or need a *offset from start.
I understand DOM ***CUTS*** the mxf, instead of using the FFOA functionality in Interop & Smpte MXF, as Qubemaster Pro or Cineasset do.
***This has a advantage that NOT MODIFIES the track reusing UUID

Related to Atmos MXF, --some-- servers need need this preroll for Atmos, if clip enter *directly* with sound, starts in PCM and few second switch to Atmos.
There is the reason that Dolby INCLUDES leader with FFOA MXF, in PCM and ATMOS tracks developed by Dolby

Experienced people puts a 2 seconds of black at initial reel 1, but in many shorts or arthouse DCPs, I found that sound tarts at 1st frame, appearing this issue. I know that is NOT a DCI request, but practical issue in real field work....

Regards,
Jaume

[carl]

Hi Jaume

I think this wish is described in this bug report. It's a bit tricky to do, with the way DCP-o-matic is currently written, but it'll come (hopefully sooner rather than later).