So I set it up so it would start 5 minutes in and encode 15 minutes. What I
got was a DCP the length of the full film, with audio starting at the
beginning and ending at the end (i.e no trimming), however the video starts
from 5 minutes in and goes for 15 mins (i.e. trimming worked). It has done
the trimming as asked for image but not audio. This means the audio is
massively out of sync, by 5 minutes.
The good new is my audio problem seems to be sorted and it looks great
(think the gamma was 2.2).
Ben
--
*Ben Edwards, Video Editor and Cameraman*
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*skype**:**funkytwig** twitter:**@funkytwig*
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Am 09.08.2014 um 16:56 schrieb Ben Edwards:
> PS, can I change the name of the directory to change the name of the DCP or will this screw things up?
Watch this:
http://digitalcinemanamingconvention.com/unabridged.asp
DCP-o-matic will add a -25 automatically to the DCP name when you check 'Use ISDCF name' and have a non-24fps frame rate chosen.
You can change the directory names containing the two separate DCPs later, that's no problem. Just don't change any of the filenames contained in the DCP directory.
Like 'Feature_25fps_SMPTE'
- Carsten
>
>
> On 9 August 2014 15:54, Ben Edwards <list4me2(a)gmail.com> wrote:
> Thanks for that. Looks like I will create a 2 versions. A 25FTS SMPTE and a 24FPS IOP. Does this sound sensible? Seem to cover most bases.
>
> If I create one, then change the fps and SMPTE/IOP settings and create a second DCP I assume it will create 2 DCP directories, will it have to totally re-encore?
>
> Lastly it looks like the DCP name does not show the FPS, should I change the name. First time calling it filmename_25fps and then filmname_24fts. Will It totally re-encode if I do this?
>
> Ben
>
>
>
>
>
>
> On 9 August 2014 13:16, Carsten Kurz <audiovisual(a)t-online.de> wrote:
>
> Am 09.08.2014 um 13:59 schrieb Ben Edwards:
>
>> I am confused, one minute I am being told it will not be notable, the next that is will "change the pitch and the tonality of the voices and music. ". This is kind of what my googeling also seemed to reveal. There seem to be two camps;(.
>
>
> Not really ;-)
>
> Resampling is no problem to do in good quality, but it leaves the sound with a 25/24 pitch change. If you also want to pitch-correct the resampled audio, you need a higher quality approach. However, a small change like the one needed for 24/25 is usually unnoticeable. It get's more complicated with larger pitch changes, and typically you would want to resort to external tools using special algorithms. Music is typically more complicated to pitch correct than dialog.
>
> Did you ever notice strange audio, pitched audio, etc. on any cinema presentations, DVDs, BluRays, etc.? No? Then you shouldn't care, because this technique is used widely for most entertainment content. As you are living in europe, which is a 25/50Hz country, you will be exposed to this every day when watching/listening entertainment media, at home or in cinema.
>
> As you have your audio in separate files, you could play with it easily using external tools like Audacity, Audition, etc.
>
> Always trust your own eyes and ears.
>
> The best way, of course, is to produce in 24fps/48KHz right away if aimed for cinema.
>
>
> - Carsten
>
>
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>
>
>
> --
> Ben Edwards, Video Editor and Cameraman
> web:www.nkytwig.com mobile:07773 02 44 82 skype:funkytwig twitter:@funkytwig
> iContact Community Video | Bristol Community Channel
>
>
>
> --
> Ben Edwards, Video Editor and Cameraman
> web:www.nkytwig.com mobile:07773 02 44 82 skype:funkytwig twitter:@funkytwig
> iContact Community Video | Bristol Community Channel
Am 08.08.2014 um 13:49 schrieb Ben Edwards:
> OK, trying to do this but if I start 4 mins in and trim 1:20 off end I get different length for audio and video. Any advice.
Maybe just a display rounding problem. Video is referenced in frames, audio in samples. Carl will probably comment on this. Never used the trim feature with split video/audio content. As this is only for testing, small sync issues shouldn't be a problem, as long as it is correct for the full length version.
- Carsten
>
>
>
>
> On 8 August 2014 11:23, Carsten Kurz <audiovisual(a)t-online.de> wrote:
>
> Am 08.08.2014 um 12:15 schrieb Ben Edwards:
>
> > Latest version, downloaded it a few days ago. The audio was 5.1 added as 6 separate files. When I tried to create first 15 minutes last time and it did whole film I was doing the same thing and sync was OK. I did however have to reimport all the media as when I reloaded project it would not work so I deleted all the media and imported.
>
> That will be the problem - when you insert video and audio separately, you need to trim ALL files that need to run in parallel with the same parameters. If one is left untrimmed, DCP-o-matic will create a full length DCP with the remaining trimmed audio and video tracks padded with silence and/or blacks.
>
> - Carsten
>
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>
>
>
> --
> Ben Edwards, Video Editor and Cameraman
> web:www.nkytwig.com mobile:07773 02 44 82 skype:funkytwig twitter:@funkytwig
> iContact Community Video | Bristol Community Channel
So I managed to create a DCP of the first 30 mins of the feature I am
DCPing and get it on a ext3 drive. Ingested and plays fine but there are
a few problems.
Firstly the audio is pooping in some places, We have a Dolby CP750 and
setting it between 3.5-4 seems about right for this DCP. This is very low
so I guess I have made the DCP to loud but the popping surprises me, is
this normal if the DCP is too loud. Looking at the audio graphs in
DCPOMatic it looked like it was peeking about -12 db. I guess the best
thing is to use the level calculator and make 3.5 come out as 5. The 5.1
is mixed to 0db and I had a -1db audio tweek in DCPOMatic.
The other issue is that there seem to be some blown whites. I have been
trying to find out what the grading was set up for but used 2.4 as they are
being non responsive (I have been told it is Rec.709). What effect is
using 2.2 or 2.6 going to have. If I go to 2.6 am I correct in thinking
the image will go darker. The thing is there are some very dark scenes. My
understanding is that at the ends of brightness (very dark and bright)
changes in the gamma curve used have the least effect. i did ask if the
whites where ever meant to be blown (its a found footage mockumentery) and
the answer was no. Any advice?
Regards,
Ben
--
*Ben Edwards, Video Editor and Cameraman*
*web*:*www.nkytwig.com* <http://funkytwig.com/>* mobile:**07773 02 44 82*
*skype**:**funkytwig** twitter:**@funkytwig*
<https://twitter.com/funkytwig>iContact Community Video
<http://www.icontactvideo.org/> | Bristol Community Channel
<http://bristol.mirocommunity.org/>
Hi, the fiml is 1:48. I started creating DCP then thought I should try
just the first 30 mins. When I restarted (after deleting stuff from the
directory and setting triming, and not forgetting to press set.) it still
says it will take 16 hours. Framerate has gone from 3.9 to 2.6;(.
Ben
--
*Ben Edwards, Video Editor and Cameraman*
*web*:*www.nkytwig.com* <http://funkytwig.com/>* mobile:**07773 02 44 82*
*skype**:**funkytwig** twitter:**@funkytwig*
<https://twitter.com/funkytwig>iContact Community Video
<http://www.icontactvideo.org/> | Bristol Community Channel
<http://bristol.mirocommunity.org/>
(This is from a previous tangental thread)
"When using DCP-o-Matic, I check if center channel "peak" is around -12db.
Certainly not scientific enough but most of the time it ends with a normal
human bearable audio level. It becomes more difficult to "predict" with 5.1
audio using phase inversion, as you need all the channels to get not only a
good balance but something human-understandable…" Gérald Maruccia
I have a 5.1 mix peaking at 0db. Any advise on what to do. I dont quite
understand the 'I check if center channel "peak" is around -12db', well I
understand what it means but dont know to do it in DCPOMatic.
Ben
--
*Ben Edwards, Video Editor and Cameraman*
*web*:*www.nkytwig.com* <http://funkytwig.com/>* mobile:**07773 02 44 82*
*skype**:**funkytwig** twitter:**@funkytwig*
<https://twitter.com/funkytwig>iContact Community Video
<http://www.icontactvideo.org/> | Bristol Community Channel
<http://bristol.mirocommunity.org/>
I know it was my own idea - but maybe it is better to make the CC: address a BCC: ? Because in general the KDM receiver shouldn't see it. No big thing, but...
Or may just offer both, I think there is still enough space on that tab.
Commercial KDM delivery emails usually have a bunch of recipients for internal and external reference. Sometimes half a dozen people receive an individual KDM Email.
- Carsten
Been doing some digging and it seems 4444 may be overkill. The colourspace
and bit depth are higher (bit depth 12) but if this is beyond DCP is seems
pointless.
Also in the preview (after file imported) when I look at same clip in 422
and 4444 the 4444 one looks pookier with better blacks and the 422 one
looks a little flat/washed out. Is this just the preview?
Has anyone done any comparisons on high end footage?
Ben
--
*Ben Edwards, Video Editor and Cameraman*
*web*:*www.nkytwig.com* <http://funkytwig.com/>* mobile:**07773 02 44 82*
*skype**:**funkytwig** twitter:**@funkytwig*
<https://twitter.com/funkytwig>iContact Community Video
<http://www.icontactvideo.org/> | Bristol Community Channel
<http://bristol.mirocommunity.org/>
