QT Ref to Self Contained Movie with QT Pro Field Motion/Order Issue with ama?
MacPro OS 10.6.8 SNDX 5.5.3 1:1 SD mxf project 30I
So now that I have ama with 5.5.3 for QT .movs I figured I'd run the file I make back through Avid to my error logging scope. I export a QT ref to maintain 4 tracks of audio and then use QT Pro to make a self contained .mov. The resulting movie says Formant AVid 1:1x, 720x486 and plays fine in QT Pro. I ama link to the file and it seems to play with field order reversed. The field motion says unknown and the video format says Ai :xTime. Huh? I change the field motion to interlace and still field order seems reversed. If I change to progressive it plays correctly. The original is interlaced with 2:3 pulldown on most of the source. I can go field by field and everything is fine when field motion is set to progressive but if I switch to interlace or 2:3 film I can see the field order issues as a jog field by field. SD masterial in my NTSC world is always even lower field first. What is happening in the food chain here that makes
interlace field motion show inverted field order.
Now for the error log which is why I did this in the first place. The sequence has the safe color limit effect with RGB limited to 16-235 and 422 box checked. I can play the original sequence out to my scope and it won't trigger any errors with the scope set to Tek defaults and 0% area in the tolerance settings for the alarms. This is running through the external legalizer which is so so but seems to do the job when combined with the safe color limit effect. If I bypass the legalizer I get some occasional errors RGB gamut wise. Now with the ama clip back in avid I get identical errors playing back the exported clip. The errors are even frame accurate to playing the original sequence both start and stop of the errors. I know that's the way it should be but it's nice to see it working symmetrically. So I guess just like I error log my final tapes with a 1% area tolerance I have to apply the same to the QT files. If the safe color limiter
was more effective perhaps no errors would get out. It's funny that I need both the safe color limit on the sequence and my external ensemble legalizer to get no errors. If I just use the ensemble I will get errors which is why I use both. Also the fact that it is the file I'm told not the digibeta master that is used for air. The tape is just a backup. Oh well why does avid interpret the QT ama wrong when I set it too interlace. HMMMMMMMMM
John Moore
Barking Trout Productions
Studio City, CA
bigfish@pacbell.net
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