• AJA Video Systems

  DVCPROHD sync

  Posted by Sterling Noren on June 2, 2006 at 5:46 pm

  A problem I had a long time ago has returned with a vengence…

  Im having a heck of time lately with sliding AV sync on my DVCPROHD clips. It seems just about every other capture goes out of sync (the sync gets worse the longer the clip is) and I have to recapture. Normally I’ll just delete the media, restart the system and recapture. But sooner or later it will happen again.

  I have no idea what is casuing this to happen but its been going on for several days now (and has happened in the past…Im finally trying to solve it).

  A few notes:

  Deleted the prefs many times which always fixed the problem however sometimes I simply restarted (without deleting prefs) and that fixed it too.

  Once I noticed my raid was down to 100GB which is too little space left…that has caused problems in the past but now I have 400GB free.

  Captured same clip as 8bit uncompressed w/o problem…seems to be DVCPROHD related.

  Audio is early and verified clips are indeed out of sync by playing them in QT player using computer speakers.

  AJA is helping me but as stumped as I am. Any suggestions? …has this happened to anyone else?

  My system:

  dual 2GHz PowerPC G5 with 5GB ram
  OSX 10.4.6
  QT 7.1.0
  FCP 5.0.4
  Kona 2 drivers 2

  Thank you very much in advance for any help.

  Sterling

  Sterling Noren replied 20 years ago 2 Members · 2 Replies
• 2 Replies

• 

  Walter Biscardi

  June 3, 2006 at 11:50 am

  [WideWorld HD] “Im having a heck of time lately with sliding AV sync on my DVCPROHD clips. It seems just about every other capture goes out of sync (the sync gets worse the longer the clip is) and I have to recapture. Normally I’ll just delete the media, restart the system and recapture. But sooner or later it will happen again.”

  Sounds almost like a drop frame vs. non-drop frame issue or your audio was recorded to tape at the wrong frequency. we capture DVCPro HD pretty much all the time now and never see anything like this with our setup which is basically identical to yours, though we’ve gone up to 5.1.1, but we worked with FCP 5.0 for the past year.

  Walter Biscardi, Jr.
  https://www.biscardicreative.com

  Director, “The Rough Cut”
  https://www.theroughcutmovie.com

  Now Posting “Good Eats” in HD for the Food Network

  “I reject your reality and substitute my own!” – Adam Savage, Mythbusters
• 

  Sterling Noren

  June 5, 2006 at 10:33 pm

  Thanks for the input Walter. Today its been working fine and now I am done capturing media for this project and wont be able to test further until the next go round.

  Im pretty sure its not related to the way the audio was captured since I can reboot and recapture successfully off the same tape. Also, I am working on a long-term series and get all of my tapes from the same cameraperson using the same equipment so those kinds of variables are minimized.

  Thanks,

  Sterling

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