I always get tone at the top of my mix to make sure nothing has gone wonky in the food chain. My Protools stems always have matching time code to my sequence. I've never had them come in any other way when they give me an aaf I import it and voila the stems have matching code.
In this case I was busy and no one had asked the mixer for the stems so I just said make me wav files of the stems. His stems include bars and tone etc... I didn't get a chance to talk with him about just program start. I routinely ask for an extended region at the end of a program so that when I cut in textless elements I can still have a single audio stem to the end of picture. When I bring the wav stems into Avid the time code is correct and matches it's just the other programs that seem to be reading the time code in a different manner.
These files are going out to be made into an IMF most likely using Clipster so my concern is to make sure they understand and see the same time code on their end. Our protools systems are pre offline bounce version but just because the bounce was done offline on the newer versions I still think the resulting tracks end up with matching time code to the session they are working on. I'm not that versed in the subtleties of how or why my stems always have matching code to my sequence they have just always matched. I had just always figured that the stems inherited the time code of where they were in a session timeline just like a mixdown in Avid has matching time code to the sequence. I will ask our mixers for clarification on what time code the wavs inherit and how offline vs online bounce might effect the resulting time code.
Regardless of any of this I'm still perplexed as to why Wave Agent sees a different start time code than Avid does when I set Avid to read the wav time code as 23.976 ND. I tried changing frame rates in Wave Agent but the start time code does not change when I do this like it does in Avid. There is a check box in Wave Agent that says something about maintaining Start Time Code. Perhaps that plays into this but it didn't seem to have any effect. Then when I enable the time code track in QT Pro 7 it displays something that seems to represent samples after midnight but it doesn't match the samples after midnight displayed in Wave Agent. Just a lot of inconsistencies that seem curious and must speak to some fundamental aspects of wav files and their time code that I don't fully understand and how various programs interpret them.
---In Avid-L2@yahoogroups.com, <cutandcover@...> wrote :
On Mon, Apr 2, 2018 at 10:18 PM, John Moore bigfish@... [Editing-List] <Editing-List@yahoogroups.com> wrote:So out new delivery spec is that program starts at 00:00:00:00 23.976. This puts bars and tone and slate on the other side of midnight. Sort of a pain but it's what they want. The final file will just start at 00:00:00:00 with no bars and slate.Protools spit out wav stems to go with the DPX. My original sequence in Avid started at 23:59:01:00 to accommodate a 00:00:00:00 start time code. Protools conformed to that timeline. Now the final wave stems if I import them into Avid and tell avid the time code is 23.98 I get a start time code of 23:59:01:00 as I would expect.The curiosity I have if I open one of the wav stems in Wave Agent it lists the Start TC as 00:59:04:16 and Samples since Midnight as 170314145. There is a frame rate that is blank in the Recording Info window. If I set that to 23.97ND the start time doesn't change.If I open the wav stem in QT Pro7 under properties there is a time code track that by default is off. QT lists no frame rate but if I enable the time code track there is a number that appears that looks like the number of samples. It appears just above the timeline bar and reads "170137968. If I click on the time counter the choices are standard and frame. I do not see a choice of time code in the time counter pop up like I usually do.So what is the actual time code associated with these wave files? Avid reads exactly what it should be but why is there a difference in Wave Agent and QT Pro7? I don't usually do much with wavs so I am not playing along very well.Another strange to me thing is in wave agent even though these are mono stems it sees any of the 5.1 stems as interleaved with 6 channels and any of the 2.0 stems as stereo. I assume this has something to do with the default naming conventions out of protools. Does wave agent do some sort of scan of the source folder and find matching wav files based on the file naming convention or is there some under the hood meta data that makes this happen? I've had issue with Avid and wavs when the auto detect poly bwav files option is on. I probably don't have the exact nomenclature right but I recall having to turn that type of function of to bring stems in a mono stems. I can't check on my system right now do to a long DPX export.Any clarification on wav time code and the behavior I'm seeing in Wave agent would be helpful.John Moore Barking Trout Productions Studio City, CA bigfish@...
Posted by: bigfish@pacbell.net
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