Yes it's the Export vs. Save As that causes the interleaved audio and the loss of Time Code. The duration differences are as you say a drop vs. non drop. If I remove the tc track QT Pro shows actual clock time duration. Still doesn't explain why I can add video to audio but not the other way around.
I did a mixdown test last night, but I didn't mix down to ProRes. In the past with all the gamma shift issues going to ProRes on Avid exports etc.... I found at that time a QT ref of the DNX Avid media would eport to ProResHQ iusing QTPro without any noticable video level shifts. That is based on ama linking to the resulting file back into Avid and looking at it on a scope. My understanding is the ama link bypasses the QT engine where those level/gamma shifts seem to occur. As a result of that and my impression that Avid didn't do a proper conversion to ProRes on export to a .mov I have maintained that workflow. The hitch now is the inerleaved audio is a problem. I've got it working now but it's time I should test out Sorenson to see if it will take the Avid QT Ref and generate a ProRes file with 12 mono stem audio tracks and keep the time code.
---In avid-l2@yahoogroups.com, <bouke@...> wrote :
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----- Original Message -----To: Avid L2Sent: Wednesday, June 10, 2015 8:07 PMSubject: [Avid-L2] QT Pro can add video to audio but not audio to video/ duration change after QT change?sI have exported QT ref of the 12 channels of audio stems and then done a save as to get a .mov of 12 mono tracks of the stem. The duration of this file is 57:08:16. I then do a QT ref of the video which has mixed frame rates so I have to check mix down audio even though there is no audio on the sequence. The QT ref video .mov also has a duration of 57:08:16. Then I export to ProResHQ 422. The resulting self contained ProRes file shows a duration of 57:12:09 in QT Pro. If I then use QT change to add time code to the video file the duration changes to 57:08:16 which is the correct duration according to the original Avid sequence. Weird? If I then delete the time code track the duration goes back to 57:12:09.If I ama the files back into avid they are all the correct duration. Now if I try to take my self contained audio movie with 12 mono stems and edit it into the video movie using QT Pro I get a duration error and it won't do it. If I instead take the video file and edit it into the self contained audio file that works. WTF? The resulting video married to audio file is in sync on looks correct when ama'd back into Avid. When will the weirdness end? I even tried to set a custom frame rate of 23.976 in QT Pro before exporting to ProRes but the resulting file exhibited the same behavior. I have a safe color limiter over the entire sequence which is rendered so it's media wise like a video mixdown.I'm curious what Avid is doing under the hood that makes a QT Ref video file with mixed frame rates still need the audio mixdown box checked. There is no sound to mix down.The only difference I can see to adding the video to the audio file is in the info inspector the audio mono tracks/channels are listed above the ProRes Video. I don't know if that has any implications down the line. I wouldn't think so, but clearly thinking isn't helping me out much.John Moore
Barking Trout Productions
Studio City, CA
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