23 Feb
2016
23 Feb
'16
10:28 a.m.
Very little experience with GDC. I'm adding my colleague in case she
remembers any case.
Subtitles errors are rare even during festivals, but usually fatal and
easy to remember :) We have never seen our usual workflow fail, either
direct from dom or SMPTE with michaelcinquin with first and last
empty.
Manuel AC
On Tue, Feb 23, 2016 at 11:10 AM, lilian lefranc via DCPomatic
<dcpomatic(a)carlh.net> wrote:
Le 22/02/2016 20:36, Manuel AC via DCPomatic a écrit :
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https://www.facebook.com/akadcp
The first one empty is for one of those legendary errors that nobody
has ever seen but we keep avoiding :) It goes to say that timing will
be off-sync if there is no subtitle on timecode 0. Like it will treat
the first subtitle as 0 and ignore the actual timecode, in a similar
manner it ignores an entry point.
Maybe that's why I'm facing issues with 25fps SMPTE subtitles and GDC
servers.
Have you ever experiencing 25fps DCP with subtitles and GDC?
The only solution I found is to use IOP subtitles for now...
The last one is for SMPTE, don't do it and just wait for a (non)
projection with an Alchemy server.
Supposedly it just need to be longer than the other content of the
reel. I would not be surprised to see a server making random errors if
the last subtitle have a very high timecode instead of the actual reel
length.
Anyone knows the reason behind that length requirement for SMPTE? It's
pretty annoying.
On Mon, Feb 22, 2016 at 11:11 AM, lilian lefranc via DCPomatic
<dcpomatic(a)carlh.net> wrote:
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Le 22/02/2016 10:47, Manuel AC via DCPomatic a écrit :
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On Mon, Feb 22, 2016 at 9:44 AM, lilian lefranc wrote:
>
> Why do you have empty subtitles at the beginning and the end of your
> files?
> It is not necessary for interop and it causes troubles for servers in
> many cases!
>
What combination of factors have you seen fail for that case? I only
use SMPTE but it's always good to know.
It causes display issues in some cases (empty subtitle in the middle of
the
reel).
Subtitles after an empty one may not display.
I saw it one time, but I can not say if it's a common issue.
In doubt I recommend not to use empty subtitles in Interop, as it has no
utility.
> For smpte I recommend not to put the empty subtitle (ONLY) at the end,
> it
> is better if the mxf wrapper does it, as it know the reel duration it
> will
> wrap.
>
michaelcinquin would not add the empty subtitles unless you told the
tool to do so, and it does not have access to the reel duration
because it only receives a subtitle file.
I don't use this tool so I don't know how it handles the files.
If you look at the versioning tool, it asks for the CPL file so it knows
the
reel duration.
If not, you have to know the reel duration before wrapping, that's why it
asks for the last TC.
No idea why to let an empty one at the beginning, for me it has no
utility.
Lilian
>
>
> Manuel AC
>