20 Sep
2022
20 Sep
'22
12:23 p.m.
Thanks for answer Carl. The SMPTE spec you quoted does seem quite clear
to me - the restriction to 256kB applies to closed captions only, not
open subtitles.
However, I'm not sure what situation is for Interop.
Does anyone have any in-the-field experience of this? e.g. "X projector
won't play subtitle XML above 256kB"
Many thanks,
Jim
On 19/09/2022 11:24 pm, Carl Hetherington via DCP-o-matic users wrote:
On 20.09.22 00:13, Jim Dummett via DCP-o-matic users wrote:
Hi all.
First posting on this list since Carl mentioned possibly shutting it
down. Perhaps it's had a chilling effect on public discourse!
To be fair it wasn't exactly speakers' corner before ;) It should
still be fully functioning (though now hidden from view a bit more on
the website...)
A question for the font of knowledge...
I believe there's meant to be a limit on the size of a subtitles XML
file in a DCP of 256KB. i.e. for most features, the DCP needs to be
cut into reels to avoid exceeding this limit if there are soft subs.
However in practice we receive many features with subtitles as
single-reel DCPs (though Deluxe etc still seem to use multiple reels).
When making a DCP which is intended to screen widely, is it wise to
stick to multiple reels? Or was this limitation purely for the
benefit of series 1 projectors which are now mostly extinct?
If anyone has any practical experience of this (especially any
projectors where this limit does still apply), that info would be
hugely helpful.
I'm afraid I have no practical experience these days, but all I would
point out is that these SMPTE Bv2.1 guidelines that were published
not-so-long-ago say:
* XML files used for closed captions /should/ be 256kB or less (but
this does not apply to subtitles)
* Cumulative size for a timed text track (including PNGs/fonts)
/shall/ be 115MB or less.
* Fonts /shall/ be 10MB or less.
Make of that what you will!
Best,
Carl
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