We got this from the Network and it does appear what I was suspecting is in fact the issue. I guess this means the order of tracks seen in QT Pro 7 Properties Window is an indication from top to bottom of the track/Atom order. Fortunately when I do a normal QT Ref out of Avid that doesn't require an audio mixdown the track order is correct which is why my previous episodes passed. Now I know. I will try to post this document to the files section. Here is a snippet with explanation:
All Quicktime (MOV) files are built from multiple components called "atoms." A MOV file has three types of "track atoms:" video, audio, and other. In a standard MOV file the video track atom is the first track atom, followed by the audio track atoms. The "other" track atoms (which include time code tracks or subtitle tracks) are the last atoms in the file. In the problem files the "other" track atom, usually the time code track, follows directly after the video track. The audio track atoms are then displaced. In some player tools and transcoders this non-standard track order prevents the tool from accessing the audio track atoms, resulting in no audio in playback or on the transcoded output file.
---In Avid-L2@yahoogroups.com, <bigfish@...> wrote :
I exported my typical QT Ref .mov out of Avid but because I had mixed frame rates Avid forces the audio to be mixed down. I work around this by exporting a QT Ref with the audio mixed down to 2 tracks. I then do a second audio only QT Ref export of the sequence to maintain in this case all 12 discrete tracks. In QT Pro 7 I remove the stereo audio mixed down tracks and then edit in the 12 discrete tracks. Then I do a Save As and all is generally well.
Today I got a QC rejection stating:
"The MOV file has a bad logical track order. Audio track atoms do not directly follow video track atoms."
The only difference I can see in QT Pro 7 is in the properties window. For this file the order top to bottom of tracks is Video then Time Code and then the 12 audio tracks. On previous files that passed what they call the "sniff" test the order is Video then 12 audio tracks then time code. Given the above QC note I'm wondering if this is why the file is being flagged?
Any insight would be welcome. I'm going to contact the QC folks for clarification as to what raised the ref flag. I don't understand why the track order is problematic given the file works fine in QT Player and will ama back into Avid fine and I've used this workflow without issue for years.
John Moore Barking Trout Productions Studio City, CA bigfish@...
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Posted by: bigfish@pacbell.net
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