I would suppose that the BD is 23,976fps and the DCP is a(n already made) 24fps.
That would explain length inconsistency between BD sound and DCP.
What if you let the project "know" about the difference and that you want it to resample the audio? Does the duration gets the same then?
I read again, and I see that you write that you check creating a VF, keeping the original sound and picture.
What about un-checking the sound and disabling the audio channels of the original, while managing the way you want the new ones?
Edit 2, explanatory: My guess is that, if dragged and dropped the audio, it might have been assigned after the original audio and video timing.
A lot of details to check, but necessary nontheless.
Not Possible to create VF
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Torty
- Posts: 8
- Joined: Mon Sep 12, 2022 9:33 am
Re: Not Possible to create VF
Hi Carl, and the othrs,
I try again to create a VF-DCP. Could it be that the duration-issue is happen because i took the soundfile from the BR before i Let DCP-o-Matic do his job? Usualy the DCP after coding is 23.976fps and the sound still have 24fps... sure DCP-O-Matic Say its the same lenght but maybe there are a few hundreth of a second difference...
Where can i resample the Audio? is this the "auto-crob" button?
btw. in the second i add the Soundfile i can not change any settings in the VF-Setup. here is always the error showing because of the lenght of the Audio and i have to change to "split by video content."
What else can i do?
Torty
I try again to create a VF-DCP. Could it be that the duration-issue is happen because i took the soundfile from the BR before i Let DCP-o-Matic do his job? Usualy the DCP after coding is 23.976fps and the sound still have 24fps... sure DCP-O-Matic Say its the same lenght but maybe there are a few hundreth of a second difference...
Where can i resample the Audio? is this the "auto-crob" button?
btw. in the second i add the Soundfile i can not change any settings in the VF-Setup. here is always the error showing because of the lenght of the Audio and i have to change to "split by video content."
What else can i do?
Torty
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carl
- Site Admin
- Posts: 2697
- Joined: Thu Nov 14, 2013 2:53 pm
Re: Not Possible to create VF
The audio resampling should happen automatically.
So after you set to "split by video content" in the reels dialog, you still get the same error in the timeline dialog?
So after you set to "split by video content" in the reels dialog, you still get the same error in the timeline dialog?
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IoannisSyrogiannis
- Posts: 241
- Joined: Mon Nov 13, 2017 8:40 pm
Re: Not Possible to create VF
@Torty, I can't follow what you write:
"Usualy the DCP after coding is 23.976fps and the sound still have 24fps"
No DCP is 23,976 fps. Most BluRays are. (Some, admittedly are 24fps.)
When you add the audio on the content part, the original DCP and the new audio should have their "timing" tab individually (each its own). Do you get the exact same numbers on "Position" and "Full length" for each of those? (That is the most reliable way to tell.) If yes, then not the position nor the sample rate is the issue. If not, get the position to be the same and figure out what you need to put inside the "Advanced content settings>Video frame rate that content was prepared for" field for the audio.
@carl, if the video is 24 fps (already squeezed from 23,976) while the added (separate file) audio is 23,976 fps, one should tell DCP-o-matic how to treat the audio. And that is a good thing. No question that a mechanism that would detect the exact ratio of 1000/1001 etc. etc. and warn accordingly would be a step closer to error-proofing it, but there will be always something one may miss.
Right now, we weren't even been told the BD's framerate, nor if the originally made DCP and the .mka file for the VF come from the exact same BD...
And I can add more parameters, like cutting frames before pressing "make DCP" for the original DCP.
@Torty (again), it's been five days, the most sensible practice I can think of is disregard what I have written earlier, export the BluRay disc with the audio of your choice and the video and make the OV anew.
Then, if you want to master the DCP creation, give yourself some time to check how everything works out.
You can even check how the audio .mxf from the newly made DCP is working with the previously made DCP. If, for instance, the CPL shows the same number of frames between the two DCPs. Logically, if the audio channels created for the two DCPs are the same and the duration is the same as well, the audio files from the two DCPs should be the exact same size.
"Usualy the DCP after coding is 23.976fps and the sound still have 24fps"
No DCP is 23,976 fps. Most BluRays are. (Some, admittedly are 24fps.)
When you add the audio on the content part, the original DCP and the new audio should have their "timing" tab individually (each its own). Do you get the exact same numbers on "Position" and "Full length" for each of those? (That is the most reliable way to tell.) If yes, then not the position nor the sample rate is the issue. If not, get the position to be the same and figure out what you need to put inside the "Advanced content settings>Video frame rate that content was prepared for" field for the audio.
@carl, if the video is 24 fps (already squeezed from 23,976) while the added (separate file) audio is 23,976 fps, one should tell DCP-o-matic how to treat the audio. And that is a good thing. No question that a mechanism that would detect the exact ratio of 1000/1001 etc. etc. and warn accordingly would be a step closer to error-proofing it, but there will be always something one may miss.
Right now, we weren't even been told the BD's framerate, nor if the originally made DCP and the .mka file for the VF come from the exact same BD...
And I can add more parameters, like cutting frames before pressing "make DCP" for the original DCP.
@Torty (again), it's been five days, the most sensible practice I can think of is disregard what I have written earlier, export the BluRay disc with the audio of your choice and the video and make the OV anew.
Then, if you want to master the DCP creation, give yourself some time to check how everything works out.
You can even check how the audio .mxf from the newly made DCP is working with the previously made DCP. If, for instance, the CPL shows the same number of frames between the two DCPs. Logically, if the audio channels created for the two DCPs are the same and the duration is the same as well, the audio files from the two DCPs should be the exact same size.