• Apple Final Cut Pro Legacy

  Audio Latency Issue

  Posted by Decloux on February 20, 2007 at 9:11 pm

  Hey folks.

  This is my first post since getting this system last month.
  Thanks in advance for any help.

  Capturing via firewire400 from canon XL1.
  Approx one hour in a single take (DV NTSC capture)
  Quicktime Capture File itself appears out of sync.

  Put into a DV NTSC timeline.
  OK so I still have a sync prob in the timeline.

  Frame Offset seems not to effectively solve the problem.
  (AUDIO FOLLOWS VIDEO is always grayed-out)

  By breaking the linkage in timeline,
  and then making the video match by moving the audio tracks to the right
  (eyeballing the lip-synch) I measured the following shift:
  Audio starts out 27 frames ahead of video.
  At 30 minutes in, it is about 19 frames ahead.
  By the end of the hour it is only 7 frames ahead.

  There are some pauses in the tape, not sure about extent
  of any timecode breakage on the tape.

  So Today
  I made a test segment using the same camera and using
  a tape from that same day of shooting (project shot way back in 1998).
  Segment created today consisted of clapping a pencil for 15sec.
  Imported same method into same timeline.
  Result: Zero Latency in timeline.
  According to timeline waveforms it’s a near perfect match.
  (Offset set to the default of 4)

  What’s going on? Is a 1-hour Capture just too long?
  From what I see, changing Capture Offset wouldn’t fix a moving target like this.
  Am I being punished for having six memory slots filled (instead of 4 or 8) ?

  FCP 5.1.3
  MacPro 2.66
  5Gb Ram (4x1Gb OWC + original 512×2)
  2x500Gb drives
  Monitoring via Built-In Line-out to self-powered speakers.
  Same result using Built-In Speaker and Headphone (on every test).
  Capture Scratch and project on nearly empty new Maxtor 500Gb drive
  (not system drive)

  Decloux replied 19 years, 2 months ago 2 Members · 4 Replies
• 4 Replies

• 

  David Battistella

  February 20, 2007 at 9:50 pm

  Try this,

  capture it in ten minute increments and then stich it together in the timeline. I still never capture more than ten miutes of media to a single clip, EVER! A sixty minute tape is logged and goes in ten minutes at a time.

  David

  Peace and Love 🙂
• 

  Decloux

  February 20, 2007 at 10:19 pm

  David
  Thanks much for the quick response

  OK –
  I will give it a shot.
  Please stay tuned to this freq, er thread – I will be back with results.
  I suppose I will batch it, so it will be a couple of hours at least.
• 

  David Battistella

  February 20, 2007 at 10:37 pm

  Try this,

  capture it in ten minute increments and then stich it together in the timeline. I still never capture more than ten miutes of media to a single clip, EVER! A sixty minute tape is logged and goes in ten minutes at a time.

  David

  Peace and Love 🙂
• 

  Decloux

  February 21, 2007 at 3:35 pm

  David –
  Thanks for the help.

  OK I’ve batched the entire 2-1/2 hours in 10-minute segments, and it seems that this clears up the latency issue.

  This is something of a relief, but I have to admit
  it’s a bit disappointing that even with “regular” DV I
  may not be able to capture larger chunks.

  If I come up with a better solution I’ll post results.

  – decloux

  “Try this, capture it in ten minute increments and then stich it together in the timeline. I still never capture more than ten miutes of media to a single clip, EVER! A sixty minute tape is logged and goes in ten minutes at a time.”

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