Good question. If I get them separately, I master my picture and audio together first. But yes on other DCP software there has to be a frame accurate correlation between picture and audio to make that adjustment. But I sometimes get audio that starts at 2 beep, and picture starting at Picture Start. How would it handle that? Even at the same frame rate? Is there an adjustment for delaying audio for sync purposes, then keeping it in sync once a frame rate adjustment has been made?

Tom Rovak - Executive Producer / Sr. Colorist / Post Production Supervisor
ROVAK COLORIST SERVICES
A Division Of The Annex Studios
Commercials, Feature Films, Music Videos, Long Form
Color Correction, Dailies, Editorial, Finish/VFX
trovak@comcast.net
(815)690-8323
Website / Commercial Reel: http://colorist-rovak.com/

From: "Carsten Kurz" <audiovisual@t-online.de>
To: "DCP-o-matic net carlh" <DCPomatic@carlh.net>
Sent: Friday, October 17, 2014 2:56:08 PM
Subject: [DCP-o-matic] audio subsampling when adjusting frame rate

I just did a test with separate video/audio clips. Imported them, video source is 24fps. DCP-o-matic reports source and DCP will have same frame rate. No mention of audio. I then adjust the DCP frame rate to 25 fps. DCP-o-matic tells me that the frame rate will be adjusted to 25 fps. However, there is no indication what it will now do anything with the audio? I think we discussed this before shortly, but didn't come to a proper conclusion. With separate audio files, will DCP-o-matic simply assume that the separate audio has to be in sync to the chosen DCP frame rate? Because with a different frame rate for video, it could just as well resample the audio to 25 fps as well - but it needs to be instructed to do so - which includes that there is a frame rate/sampling rate relation established before and a change being notified.

The question is - with separate audio, how/where do you establish it's frame rate reference at first so that DCP-o-matic knows to what framerate the audio is referenced? With interleaved audio, this is clear, upon loading it, the audio/video timing reference is established, but with separate video and audio files?


Did I make my issue clear?


- Carsten

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