On a series I'm working on we online in 23.976 then deliver 59.94i 1080 files. I am using Adobe Media Encoder to add pulldown and convert the Avid QT ref of a DNX-175X sequence to XDCam50 422 with 16 Ch of audio. I wanted to start the sequence at 00:59:00:00 so I would have a perfect A frame at the 1:00:00:00 point and I can then just change the start time code from non drop 00:59:00:00 to Drop Frame 00;58;59;28 so the then 1;00;00;00 is program start and an A frame. AME addes 3:2 not 2:3 but that's okay at the network so far.
Here's the big pain in my arse. The network insists the file start at 00;58;30;00 and have a minute of bars. Well given this is no longer an even multiple of 4 frames before 1;00;00;00 this throws the A Frame off of 1;00;00;00 and puts it at 1;00;00;02. This makes the first frame of video be a split frame when using AME. What I had been doing is outputting starting at 00:58:30:00 then taking the XDCam file from AME and changing start time to 00;58;29;28 so 1;00;00;00 was program start and an A frame. Then I would take that file and go back into AME and do a custom export trimming off the first two frames so the network had their frigging 00;58;30;00 file start time code. This was a huge time suck of almost an hour.
Today after some experimenting I found that if I do the 00:58:30:00 export of the Avid QT ref and do a custom length export trimming the first two frames like I had been doing on the 2nd pass AME still treats the A frame cadence as if it started at the first frame and not the 3rd frame. I had thought that if I trimmed the 2 frames off with a custom export length AME would have started the A Frame cadence on that trimmed frame. Fortunately it still starts it's pull down math on the very first frame of the actual QT ref file and not the custom start point. Thus when it bakes out adding pulldown the resulting 1;00;00;00 frame is an A Frame for program start and all I have to do is use QT Change and instead of giving the resulting file a start of 00;58;29;28 I give it a start of 00;58;30;00 and everything lines up and starts with an A frame at the program head. This maintains a completely consistent cadence through out the file and avoids playing the video mixdown dance which when their are patches will most certainly create cadence changes at the patch point unless the fall exactly on A frames.
Probably sounds way more confusing than it really is but believe me this is a huge time saver and media storage saver for me. AME and QT change are saving the show today.
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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