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Audio Latency Issue
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) -
4 Replies
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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 🙂
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David
Thanks much for the quick responseOK –
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. -
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 🙂
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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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