A while back I had posted I was reticent to export wav files from Avid as I had had an issue with them being -3db about 6 months ago on a project where I didn't have time to investigate and just asked protools to make them.
Today I took a protools stem that includes -20 dbfs tone and exported it from the bin to a mono wav file. This was I a stem I got from a protools aaf. The start time code of the clip is 23:59:00:00 from a 23.976 project. I assume the ProTools is also set to 23.976 as this is how we always work. The network requires us to start program at 00:00:00:00 hence the odd 23:59:00:00 to allow for bars tone and slate.
The good news is when I link back to the exported from Avid wave it comes in at -20 like it should so at least when Avid is in Direct mode and I export a single mono stem the gain seems to be unity. The big question is what about time code? If I link to the wav file in Avid the time code for the clip is correct starting at 23:59:00:00. The same is true if I drag the clip into FCP 7 project.
If I open in QT Pro 7 the properties show a time code track but none is available in the counter pulldown menu, only standard and frame. If I enable the Time code Track in the QT Pro 7 Properties window a small number window opens above the position line where video would normally be. The Counter reads 4148586560. I assume this is some sort of samples count or samples after midnight
If I bring the wav file into wave agent the start TC is listed at 24:00:26:10 and Samples Since Midnight is listed as 4148464320. The samples number is the default when I just drag the clip in. If I then set the frame rate which starts as blank to any of the presets from the pulldown menu then the Samples number changes with 23.97 ND giving the highest sample number of 4152616469 but no matter what frame rate I choose nothing matches or is close to the number displayed in QT Pro 7 window that appeared when I enabled the time code track.
If I drag the wav into Premiere Pro CC 2015.4 I get a start time code of 00:00:26:12 but in the media start column it reads 00:00:26:16320. So does that mean Premiere is reading sub samples?
With all this Avid and FCP 7 see the correct time code from the original project. I also brought the matching wav file from a protools export and it behaves the same way in wav agent. So I know it's been mentioned in previous threads that time code with wav files is tricky. I have to agree but what is the bottom line as to how to access if an exported wav has matching time code and if Avid and FCP 7 agree then why doesn't Premiere and Wave Agent agree. Premiere and Wave Agent are close but 2 frames off if I go by the clip counter in Premiere and not the media start column with all it's extra digits that I assume are samples or something.
I know audio is generally more based on sample rate and not frame rate but there is obviously some form of time code in the wav but it is interpreted very differently between programs. So what can be used as the Holy Grail of audio software to check for the correct form of time code in a wav file?
John Moore Barking Trout Productions Studio City, CA bigfish@pacbell.net
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Posted by: John Moore <bigfish@pacbell.net>
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this is the Avid-L2
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