Hi Carsten.
Sorry, didn't see your replies before. That's really interesting.
DCP-o-matic does give a warning. I thought the limit it states is 256KB,
not 640KB, but I could well be wrong.
This thread about Texas Instrument font compressor (which is no longer
supported) also sites 640KB as the limit:
https://e2e.ti.com/support/dlp-products-group/dlp/f/dlp-products-forum/7785…
I think it was someone from Motion Picture Solutions who put the 256KB
figure in my head, and that limit related to the subtitles XML file, not
the font.
Anyway, is the gist that it's only old series 1 projectors where this
limit is relevant? - and so these days it's largely (but not entirely)
irrelevant.
Jim
On 20/09/2022 2:22 am, Carsten Kurz wrote:
The hard limit seems to be the 640KByte per reel limit
for series1 projectors.. Mostly, that limit is not exceeded by the subtitle XML file, but
the font file. Therefore, Texas Instruments developed the font compressor tool to shrink
down large font files if necessary..
I think DCP-o-matic has a warning in place when subtitle assets exceed 640KBytes? At
least I remember having seen it somewhere?!
I see many arthouse DCPs that come in single reels nowadays. However, when Timed Text is
used for subtitles, it is probably a good idea to segment in reels.
- Carsten
-----Original-Nachricht-----
Betreff: [DCP-o-matic Users] Subtitle XML max length
Datum: 2022-09-20T00:14:00+0200
Von: "Jim Dummett via DCP-o-matic users" <users(a)lists.dcpomatic.com>
An: "users(a)lists.dcpomatic.com" <users(a)lists.dcpomatic.com>
Hi all.
First posting on this list since Carl mentioned possibly shutting it
down. Perhaps it's had a chilling effect on public discourse!
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.
Jim
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