19 Oct
2014
19 Oct
'14
4:05 p.m.
On Fri, 17 Oct 2014, Carsten Kurz wrote:
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?
Hi Carsten,
At the moment, DCP-o-matic looks for the video content which is active at
the audio content's start point and uses that *video* content to decide
what to do with the audio.
If, for example, you have a 24fps video file and an audio file at position
0 on the timeline and you are generating a 25fps DCP, DCP-o-matic will see
that the video is being run fast and resample the audio to cope with that.
Hence it assumes that the sound file has been prepared to be in sync with
the video file as imported.
Does that answer your question?
Regards,
Carl