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  • AJA Video Systems

    HELP!: Composite Frame Rolling & Synce Probs

    Posted by Dan Lachevre on February 28, 2006 at 11:07 am

    Hi All

    Just set up a FCP sytem on a Quad G5 with a Kona LH card [using the latest drivers] and have a problem with frame rolling from a composite input. I’m digitising from Pal VHS using the KONAs standard 625i DV capture setup and keep getting an intermittant frame rolling problem. The KONA manual says a REF is not really needed but I’m wondering if that is the problem. The frame is not rolling either on the tape or on the monitor that has a another direct line out from the VHS

    I have altered the PAL rez in the capture settings from 100% to 25% and didn’t think that would make a difference. I’m currently doing a test back at 100% to see if there is a change.

    When I’m not in capture mode and the tape is playing through into the source window it rolls there as well which made me think it was a KONA prob.

    To make things more interesting the audio goes increasingly out of sync by 1 to 2 secs on long digitizes. I suspect it is becasue of these frame rolls. Weird thing is when I set up a H264 codec capture set [I now know it is not a good codec for editing] there were no sync probs.

    Any ideas?

    Thanks in advance.

    Danny

    Robert Ober replied 20 years, 2 months ago 4 Members · 5 Replies
  • 5 Replies

  • Dan Lachevre

    February 28, 2006 at 11:08 am

  • Christopher Tay

    February 28, 2006 at 12:23 pm

    VHS signals are generally very unstable and may be why you are seeing the symptoms. Do you have another composite source that you can feed into the Kona card ? That way you can check if the composite input is working or not.

    -chrispy

  • Bob Zelin

    March 1, 2006 at 3:42 am

    Dan –
    the AJA I/O line has a standard Frame Synchronizer input on it’s composite inputs to stabilize a poor incoming VHS input. I don’t know if the LH has
    a frame sync (I don’t think that it does) – SO, you can either get an AJA I/O, or you can get a nice cheap Datavideo Frame Sync TBC for about $300 from Markertek. This will lock up your unstable VHS sources.

    Bob Zelin

  • Dan Lachevre

    March 2, 2006 at 9:05 pm

    Thanks for the Help Guys.

    I guess an external TBC is the way to go. I was under the assumption the LH had one built in for this sort of thing though. Bummer.

    Danny

  • Robert Ober

    March 18, 2006 at 10:56 pm

    I am having a similar issue capturing from a Hi8 camcorder.

    You fix your sync issue?

    Thanks,
    Robert A. Ober

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