Sunday, November 1, 2009

[Avid-L2] Punching Ctrl Track like breaks on HDCamSr insert editing Possible Solution

We've covered in the past how hitting space bar to stop a digital cut on SR-5500 decks can cause a break in the black and coded master tape that can only be solved by picking up before the break with an assemble edit.  Big pain.  I've not had that problem in a long time but tonight I decided to set the 5500 to auto Ref instead of Ext.  Hit space bar and punched a hole in the master.  I'm beginning to believe that since I always use ext Ref on the 5500  that is why I haven't been punching holes in masters when space barring out of a digital cut.  The problem with auto or video ref is that the deck is locking to incoming video when in record.  The avid when space barring out of record sends out video garbage as it stops down before it has disable the record on the 5500.  Since the deck is locking to input video it tries to relock to the garbage video glitch and this is where the hole punching comes in.  Just like the old D2s would do when you sent
it a source way out of phase vertically while it was in record.  It is my belief it is the slewing of the scanner to relock while still in record that creates the irreconcilable tape error.  With the deck forced to lock to ext Ref the deck is locking to stable house ref even when the input video turns to garbage.  If in doubt check the record machine during the edit and see if the sync ref is ext or input video.  If the later you are asking for trouble.  I can't say my theory correct but I haven't punched a hole in a master for a long time and I space bar out all the time.  Guess I just am that kind of daring guy.  Next time it happens take note of your sync ref settings and let me know if you agree with my theory.


John Moore

Barking Trout Productions

Studio City, CA

bigfish@pacbell.net

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