first frame doubled on output creates 1 frame inaccuracy

AJA Video Systems

first frame doubled on output creates 1 frame inaccuracy

Posted by Mike Kahn on January 28, 2009 at 3:52 pm

I posted this in FCP also:

I have been having this problem for a few days now. I am doing an assemble edit to a Sony HDCAM tape in an SR deck and for some reason, the first frame of whatever I put to tape is doubled up and thus creates a tape that is one frame off. I have trashed prefs, uninstalled and reinstalled kona 3 software, tried all different device control options and nothing seems to get this to go away. Has anyone else had this problem? Anywhere on the timeline, when I set the in point, it will lay down the first frame twice and go from there.

Any ideas?

Mike

FCP 6.0.5
Kona 3
Mac OS 10.4.11

Christopher Tay replied 17 years, 3 months ago 3 Members · 8 Replies
8 Replies

Jeremy Garchow
January 28, 2009 at 7:27 pm

Do you have sync going to everything? (Genlock, blackburst, whatever you want to call it).
Mike Kahn
January 28, 2009 at 7:34 pm

Yes there is house sync going to both the deck and the kona although I have the kona set for freerun ref.
Jeremy Garchow
January 28, 2009 at 9:03 pm

And what’s your deck setup for?
Mike Kahn
January 28, 2009 at 9:08 pm

The deck is set for 1080i23.98.
Jeremy Garchow
January 28, 2009 at 9:12 pm

I meant sync wise, incoming or external.

I seem to remember this issue coming up before. Did you search this forum?

Jeremy
Christopher Tay
January 29, 2009 at 2:15 am

Hi Mike,

Adjust the Playback Offset in the RS422 Device Control setting. The value is rather inconsistent but it’s usually between -1 to +1. You’ll need to play around until you get the correct value.

In my test I usually have an animated horizontal or vertical scroll so that when I check back the recording, I can easily tell if the first frame is repeated.

Also I’ve noticed that if the RS422 Device Control setting is incorrect, you will see repeated frames in the beginning of the recording as it will go back and forth.

Hope this helps.

-chrispy
Mike Kahn
January 29, 2009 at 5:06 pm

I don’t think it’s a matter of adjusting the device control setting for playback because the frame is coming in at exactly the right point. The problem is that the first frame is doubled.
Christopher Tay
January 30, 2009 at 1:59 am

Hi Mike,

That is correct. The first frame is usually doubled when you run into this problem. For me, adjusting the Playback Offset to the correct value fixes the problem.

Give it shot…no harm trying.

-chrispy

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